changeset 1723:2338d41fbd81

6943304: remove tagged stack interpreter Reviewed-by: coleenp, never, gbenson
author twisti
date Fri, 30 Apr 2010 08:37:24 -0700
parents 0c5b3cf3c1f5
children cd5dbf694d45
files src/cpu/sparc/vm/assembler_sparc.cpp src/cpu/sparc/vm/cppInterpreter_sparc.hpp src/cpu/sparc/vm/frame_sparc.cpp src/cpu/sparc/vm/interp_masm_sparc.cpp src/cpu/sparc/vm/interp_masm_sparc.hpp src/cpu/sparc/vm/interpreterRT_sparc.cpp src/cpu/sparc/vm/interpreter_sparc.hpp src/cpu/sparc/vm/methodHandles_sparc.cpp src/cpu/sparc/vm/sharedRuntime_sparc.cpp src/cpu/sparc/vm/stubGenerator_sparc.cpp src/cpu/sparc/vm/templateInterpreter_sparc.cpp src/cpu/sparc/vm/templateInterpreter_sparc.hpp src/cpu/sparc/vm/templateTable_sparc.cpp src/cpu/x86/vm/assembler_x86.cpp src/cpu/x86/vm/cppInterpreter_x86.hpp src/cpu/x86/vm/frame_x86.cpp src/cpu/x86/vm/interp_masm_x86_32.cpp src/cpu/x86/vm/interp_masm_x86_32.hpp src/cpu/x86/vm/interp_masm_x86_64.cpp src/cpu/x86/vm/interp_masm_x86_64.hpp src/cpu/x86/vm/interpreterRT_x86_32.cpp src/cpu/x86/vm/interpreterRT_x86_64.cpp src/cpu/x86/vm/interpreter_x86.hpp src/cpu/x86/vm/interpreter_x86_32.cpp src/cpu/x86/vm/methodHandles_x86.cpp src/cpu/x86/vm/sharedRuntime_x86_32.cpp src/cpu/x86/vm/sharedRuntime_x86_64.cpp src/cpu/x86/vm/stubGenerator_x86_32.cpp src/cpu/x86/vm/stubGenerator_x86_64.cpp src/cpu/x86/vm/templateInterpreter_x86.hpp src/cpu/x86/vm/templateInterpreter_x86_32.cpp src/cpu/x86/vm/templateInterpreter_x86_64.cpp src/cpu/x86/vm/templateTable_x86_32.cpp src/cpu/x86/vm/templateTable_x86_64.cpp src/cpu/zero/vm/interpreter_zero.hpp src/os_cpu/linux_x86/vm/globals_linux_x86.hpp src/os_cpu/solaris_x86/vm/globals_solaris_x86.hpp src/share/vm/interpreter/abstractInterpreter.hpp src/share/vm/interpreter/bytecodeInterpreter.cpp src/share/vm/interpreter/interpreterRuntime.cpp src/share/vm/oops/methodOop.cpp src/share/vm/prims/methodHandles.hpp src/share/vm/runtime/arguments.cpp src/share/vm/runtime/frame.cpp src/share/vm/runtime/frame.hpp src/share/vm/runtime/globals.hpp src/share/vm/runtime/javaCalls.cpp src/share/vm/runtime/javaCalls.hpp src/share/vm/runtime/sharedRuntime.cpp src/share/vm/runtime/vframe.cpp src/share/vm/runtime/vframeArray.cpp
diffstat 51 files changed, 512 insertions(+), 1893 deletions(-) [+]
line wrap: on
line diff
--- a/src/cpu/sparc/vm/assembler_sparc.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/assembler_sparc.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -3152,7 +3152,7 @@
 RegisterOrConstant MacroAssembler::argument_offset(RegisterOrConstant arg_slot,
                                                    int extra_slot_offset) {
   // cf. TemplateTable::prepare_invoke(), if (load_receiver).
-  int stackElementSize = Interpreter::stackElementSize();
+  int stackElementSize = Interpreter::stackElementSize;
   int offset = extra_slot_offset * stackElementSize;
   if (arg_slot.is_constant()) {
     offset += arg_slot.as_constant() * stackElementSize;
--- a/src/cpu/sparc/vm/cppInterpreter_sparc.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/cppInterpreter_sparc.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2002-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -26,7 +26,7 @@
   // fail with a guarantee ("not enough space for interpreter generation");
   // if too small.
   // Run with +PrintInterpreter to get the VM to print out the size.
-  // Max size with JVMTI and TaggedStackInterpreter
+  // Max size with JVMTI
 
   // QQQ this is proably way too large for c++ interpreter
 
--- a/src/cpu/sparc/vm/frame_sparc.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/frame_sparc.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -620,7 +620,7 @@
 
   // stack frames shouldn't be much larger than max_stack elements
 
-  if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize()) {
+  if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
     return false;
   }
 
--- a/src/cpu/sparc/vm/interp_masm_sparc.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/interp_masm_sparc.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -50,7 +50,6 @@
   // Any changes should also be applied to CodeEmitter::emit_osr_entry().
   assert_different_registers(args_size, locals_size);
   // max_locals*2 for TAGS.  Assumes that args_size has already been adjusted.
-  if (TaggedStackInterpreter) sll(locals_size, 1, locals_size);
   subcc(locals_size, args_size, delta);// extra space for non-arguments locals in words
   // Use br/mov combination because it works on both V8 and V9 and is
   // faster.
@@ -319,7 +318,7 @@
   ldf(FloatRegisterImpl::D, r1, offset, d);
 #else
   ldf(FloatRegisterImpl::S, r1, offset, d);
-  ldf(FloatRegisterImpl::S, r1, offset + Interpreter::stackElementSize(), d->successor());
+  ldf(FloatRegisterImpl::S, r1, offset + Interpreter::stackElementSize, d->successor());
 #endif
 }
 
@@ -330,10 +329,10 @@
 #ifdef _LP64
   stf(FloatRegisterImpl::D, d, r1, offset);
   // store something more useful here
-  debug_only(stx(G0, r1, offset+Interpreter::stackElementSize());)
+  debug_only(stx(G0, r1, offset+Interpreter::stackElementSize);)
 #else
   stf(FloatRegisterImpl::S, d, r1, offset);
-  stf(FloatRegisterImpl::S, d->successor(), r1, offset + Interpreter::stackElementSize());
+  stf(FloatRegisterImpl::S, d->successor(), r1, offset + Interpreter::stackElementSize);
 #endif
 }
 
@@ -345,7 +344,7 @@
   ldx(r1, offset, rd);
 #else
   ld(r1, offset, rd);
-  ld(r1, offset + Interpreter::stackElementSize(), rd->successor());
+  ld(r1, offset + Interpreter::stackElementSize, rd->successor());
 #endif
 }
 
@@ -356,138 +355,62 @@
 #ifdef _LP64
   stx(l, r1, offset);
   // store something more useful here
-  debug_only(stx(G0, r1, offset+Interpreter::stackElementSize());)
+  debug_only(stx(G0, r1, offset+Interpreter::stackElementSize);)
 #else
   st(l, r1, offset);
-  st(l->successor(), r1, offset + Interpreter::stackElementSize());
+  st(l->successor(), r1, offset + Interpreter::stackElementSize);
 #endif
 }
 
-#ifdef ASSERT
-void InterpreterMacroAssembler::verify_stack_tag(frame::Tag t,
-                                                 Register r,
-                                                 Register scratch) {
-  if (TaggedStackInterpreter) {
-    Label ok, long_ok;
-    ld_ptr(Lesp, Interpreter::expr_tag_offset_in_bytes(0), r);
-    if (t == frame::TagCategory2) {
-      cmp(r, G0);
-      brx(Assembler::equal, false, Assembler::pt, long_ok);
-      delayed()->ld_ptr(Lesp, Interpreter::expr_tag_offset_in_bytes(1), r);
-      stop("stack long/double tag value bad");
-      bind(long_ok);
-      cmp(r, G0);
-    } else if (t == frame::TagValue) {
-      cmp(r, G0);
-    } else {
-      assert_different_registers(r, scratch);
-      mov(t, scratch);
-      cmp(r, scratch);
-    }
-    brx(Assembler::equal, false, Assembler::pt, ok);
-    delayed()->nop();
-    // Also compare if the stack value is zero, then the tag might
-    // not have been set coming from deopt.
-    ld_ptr(Lesp, Interpreter::expr_offset_in_bytes(0), r);
-    cmp(r, G0);
-    brx(Assembler::equal, false, Assembler::pt, ok);
-    delayed()->nop();
-    stop("Stack tag value is bad");
-    bind(ok);
-  }
-}
-#endif // ASSERT
-
 void InterpreterMacroAssembler::pop_i(Register r) {
   assert_not_delayed();
-  // Uses destination register r for scratch
-  debug_only(verify_stack_tag(frame::TagValue, r));
   ld(Lesp, Interpreter::expr_offset_in_bytes(0), r);
-  inc(Lesp, Interpreter::stackElementSize());
+  inc(Lesp, Interpreter::stackElementSize);
   debug_only(verify_esp(Lesp));
 }
 
 void InterpreterMacroAssembler::pop_ptr(Register r, Register scratch) {
   assert_not_delayed();
-  // Uses destination register r for scratch
-  debug_only(verify_stack_tag(frame::TagReference, r, scratch));
   ld_ptr(Lesp, Interpreter::expr_offset_in_bytes(0), r);
-  inc(Lesp, Interpreter::stackElementSize());
+  inc(Lesp, Interpreter::stackElementSize);
   debug_only(verify_esp(Lesp));
 }
 
 void InterpreterMacroAssembler::pop_l(Register r) {
   assert_not_delayed();
-  // Uses destination register r for scratch
-  debug_only(verify_stack_tag(frame::TagCategory2, r));
   load_unaligned_long(Lesp, Interpreter::expr_offset_in_bytes(0), r);
-  inc(Lesp, 2*Interpreter::stackElementSize());
+  inc(Lesp, 2*Interpreter::stackElementSize);
   debug_only(verify_esp(Lesp));
 }
 
 
 void InterpreterMacroAssembler::pop_f(FloatRegister f, Register scratch) {
   assert_not_delayed();
-  debug_only(verify_stack_tag(frame::TagValue, scratch));
   ldf(FloatRegisterImpl::S, Lesp, Interpreter::expr_offset_in_bytes(0), f);
-  inc(Lesp, Interpreter::stackElementSize());
+  inc(Lesp, Interpreter::stackElementSize);
   debug_only(verify_esp(Lesp));
 }
 
 
 void InterpreterMacroAssembler::pop_d(FloatRegister f, Register scratch) {
   assert_not_delayed();
-  debug_only(verify_stack_tag(frame::TagCategory2, scratch));
   load_unaligned_double(Lesp, Interpreter::expr_offset_in_bytes(0), f);
-  inc(Lesp, 2*Interpreter::stackElementSize());
+  inc(Lesp, 2*Interpreter::stackElementSize);
   debug_only(verify_esp(Lesp));
 }
 
 
-// (Note use register first, then decrement so dec can be done during store stall)
-void InterpreterMacroAssembler::tag_stack(Register r) {
-  if (TaggedStackInterpreter) {
-    st_ptr(r, Lesp, Interpreter::tag_offset_in_bytes());
-  }
-}
-
-void InterpreterMacroAssembler::tag_stack(frame::Tag t, Register r) {
-  if (TaggedStackInterpreter) {
-    assert (frame::TagValue == 0, "TagValue must be zero");
-    if (t == frame::TagValue) {
-      st_ptr(G0, Lesp, Interpreter::tag_offset_in_bytes());
-    } else if (t == frame::TagCategory2) {
-      st_ptr(G0, Lesp, Interpreter::tag_offset_in_bytes());
-      // Tag next slot down too
-      st_ptr(G0, Lesp, -Interpreter::stackElementSize() + Interpreter::tag_offset_in_bytes());
-    } else {
-      assert_different_registers(r, O3);
-      mov(t, O3);
-      st_ptr(O3, Lesp, Interpreter::tag_offset_in_bytes());
-    }
-  }
-}
-
 void InterpreterMacroAssembler::push_i(Register r) {
   assert_not_delayed();
   debug_only(verify_esp(Lesp));
-  tag_stack(frame::TagValue, r);
-  st(  r,    Lesp, Interpreter::value_offset_in_bytes());
-  dec( Lesp, Interpreter::stackElementSize());
+  st(r, Lesp, 0);
+  dec(Lesp, Interpreter::stackElementSize);
 }
 
 void InterpreterMacroAssembler::push_ptr(Register r) {
   assert_not_delayed();
-  tag_stack(frame::TagReference, r);
-  st_ptr(  r,    Lesp, Interpreter::value_offset_in_bytes());
-  dec( Lesp, Interpreter::stackElementSize());
-}
-
-void InterpreterMacroAssembler::push_ptr(Register r, Register tag) {
-  assert_not_delayed();
-  tag_stack(tag);
-  st_ptr(r, Lesp, Interpreter::value_offset_in_bytes());
-  dec( Lesp, Interpreter::stackElementSize());
+  st_ptr(r, Lesp, 0);
+  dec(Lesp, Interpreter::stackElementSize);
 }
 
 // remember: our convention for longs in SPARC is:
@@ -497,33 +420,28 @@
 void InterpreterMacroAssembler::push_l(Register r) {
   assert_not_delayed();
   debug_only(verify_esp(Lesp));
-  tag_stack(frame::TagCategory2, r);
-  // Longs are in stored in memory-correct order, even if unaligned.
-  // and may be separated by stack tags.
-  int offset = -Interpreter::stackElementSize() + Interpreter::value_offset_in_bytes();
+  // Longs are stored in memory-correct order, even if unaligned.
+  int offset = -Interpreter::stackElementSize;
   store_unaligned_long(r, Lesp, offset);
-  dec(Lesp, 2 * Interpreter::stackElementSize());
+  dec(Lesp, 2 * Interpreter::stackElementSize);
 }
 
 
 void InterpreterMacroAssembler::push_f(FloatRegister f) {
   assert_not_delayed();
   debug_only(verify_esp(Lesp));
-  tag_stack(frame::TagValue, Otos_i);
-  stf(FloatRegisterImpl::S, f, Lesp, Interpreter::value_offset_in_bytes());
-  dec(Lesp, Interpreter::stackElementSize());
+  stf(FloatRegisterImpl::S, f, Lesp, 0);
+  dec(Lesp, Interpreter::stackElementSize);
 }
 
 
 void InterpreterMacroAssembler::push_d(FloatRegister d)   {
   assert_not_delayed();
   debug_only(verify_esp(Lesp));
-  tag_stack(frame::TagCategory2, Otos_i);
-  // Longs are in stored in memory-correct order, even if unaligned.
-  // and may be separated by stack tags.
-  int offset = -Interpreter::stackElementSize() + Interpreter::value_offset_in_bytes();
+  // Longs are stored in memory-correct order, even if unaligned.
+  int offset = -Interpreter::stackElementSize;
   store_unaligned_double(d, Lesp, offset);
-  dec(Lesp, 2 * Interpreter::stackElementSize());
+  dec(Lesp, 2 * Interpreter::stackElementSize);
 }
 
 
@@ -561,30 +479,18 @@
 }
 
 
-// Tagged stack helpers for swap and dup
-void InterpreterMacroAssembler::load_ptr_and_tag(int n, Register val,
-                                                 Register tag) {
+// Helpers for swap and dup
+void InterpreterMacroAssembler::load_ptr(int n, Register val) {
   ld_ptr(Lesp, Interpreter::expr_offset_in_bytes(n), val);
-  if (TaggedStackInterpreter) {
-    ld_ptr(Lesp, Interpreter::expr_tag_offset_in_bytes(n), tag);
-  }
 }
-void InterpreterMacroAssembler::store_ptr_and_tag(int n, Register val,
-                                                  Register tag) {
+void InterpreterMacroAssembler::store_ptr(int n, Register val) {
   st_ptr(val, Lesp, Interpreter::expr_offset_in_bytes(n));
-  if (TaggedStackInterpreter) {
-    st_ptr(tag, Lesp, Interpreter::expr_tag_offset_in_bytes(n));
-  }
 }
 
 
 void InterpreterMacroAssembler::load_receiver(Register param_count,
                                               Register recv) {
-
-  sll(param_count, Interpreter::logStackElementSize(), param_count);
-  if (TaggedStackInterpreter) {
-    add(param_count, Interpreter::value_offset_in_bytes(), param_count);  // get obj address
-  }
+  sll(param_count, Interpreter::logStackElementSize, param_count);
   ld_ptr(Lesp, param_count, recv);                      // gets receiver Oop
 }
 
@@ -605,7 +511,6 @@
 
   // Compute max expression stack+register save area
   lduh(Lmethod, in_bytes(methodOopDesc::max_stack_offset()), Gframe_size);  // Load max stack.
-  if (TaggedStackInterpreter) sll ( Gframe_size, 1, Gframe_size);  // max_stack * 2 for TAGS
   add( Gframe_size, frame::memory_parameter_word_sp_offset, Gframe_size );
 
   //
@@ -2018,51 +1923,11 @@
 }
 
 // Locals
-#ifdef ASSERT
-void InterpreterMacroAssembler::verify_local_tag(frame::Tag t,
-                                                 Register base,
-                                                 Register scratch,
-                                                 int n) {
-  if (TaggedStackInterpreter) {
-    Label ok, long_ok;
-    // Use dst for scratch
-    assert_different_registers(base, scratch);
-    ld_ptr(base, Interpreter::local_tag_offset_in_bytes(n), scratch);
-    if (t == frame::TagCategory2) {
-      cmp(scratch, G0);
-      brx(Assembler::equal, false, Assembler::pt, long_ok);
-      delayed()->ld_ptr(base, Interpreter::local_tag_offset_in_bytes(n+1), scratch);
-      stop("local long/double tag value bad");
-      bind(long_ok);
-      // compare second half tag
-      cmp(scratch, G0);
-    } else if (t == frame::TagValue) {
-      cmp(scratch, G0);
-    } else {
-      assert_different_registers(O3, base, scratch);
-      mov(t, O3);
-      cmp(scratch, O3);
-    }
-    brx(Assembler::equal, false, Assembler::pt, ok);
-    delayed()->nop();
-    // Also compare if the local value is zero, then the tag might
-    // not have been set coming from deopt.
-    ld_ptr(base, Interpreter::local_offset_in_bytes(n), scratch);
-    cmp(scratch, G0);
-    brx(Assembler::equal, false, Assembler::pt, ok);
-    delayed()->nop();
-    stop("Local tag value is bad");
-    bind(ok);
-  }
-}
-#endif // ASSERT
-
 void InterpreterMacroAssembler::access_local_ptr( Register index, Register dst ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  debug_only(verify_local_tag(frame::TagReference, index, dst));
-  ld_ptr(index, Interpreter::value_offset_in_bytes(), dst);
+  ld_ptr(index, 0, dst);
   // Note:  index must hold the effective address--the iinc template uses it
 }
 
@@ -2070,27 +1935,24 @@
 void InterpreterMacroAssembler::access_local_returnAddress(Register index,
                                                            Register dst ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  debug_only(verify_local_tag(frame::TagValue, index, dst));
-  ld_ptr(index, Interpreter::value_offset_in_bytes(), dst);
+  ld_ptr(index, 0, dst);
 }
 
 void InterpreterMacroAssembler::access_local_int( Register index, Register dst ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  debug_only(verify_local_tag(frame::TagValue, index, dst));
-  ld(index, Interpreter::value_offset_in_bytes(), dst);
+  ld(index, 0, dst);
   // Note:  index must hold the effective address--the iinc template uses it
 }
 
 
 void InterpreterMacroAssembler::access_local_long( Register index, Register dst ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  debug_only(verify_local_tag(frame::TagCategory2, index, dst));
   // First half stored at index n+1 (which grows down from Llocals[n])
   load_unaligned_long(index, Interpreter::local_offset_in_bytes(1), dst);
 }
@@ -2098,18 +1960,16 @@
 
 void InterpreterMacroAssembler::access_local_float( Register index, FloatRegister dst ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  debug_only(verify_local_tag(frame::TagValue, index, G1_scratch));
-  ldf(FloatRegisterImpl::S, index, Interpreter::value_offset_in_bytes(), dst);
+  ldf(FloatRegisterImpl::S, index, 0, dst);
 }
 
 
 void InterpreterMacroAssembler::access_local_double( Register index, FloatRegister dst ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  debug_only(verify_local_tag(frame::TagCategory2, index, G1_scratch));
   load_unaligned_double(index, Interpreter::local_offset_in_bytes(1), dst);
 }
 
@@ -2135,94 +1995,60 @@
 }
 #endif // ASSERT
 
-void InterpreterMacroAssembler::tag_local(frame::Tag t,
-                                          Register base,
-                                          Register src,
-                                          int n) {
-  if (TaggedStackInterpreter) {
-    // have to store zero because local slots can be reused (rats!)
-    if (t == frame::TagValue) {
-      st_ptr(G0, base, Interpreter::local_tag_offset_in_bytes(n));
-    } else if (t == frame::TagCategory2) {
-      st_ptr(G0, base, Interpreter::local_tag_offset_in_bytes(n));
-      st_ptr(G0, base, Interpreter::local_tag_offset_in_bytes(n+1));
-    } else {
-      // assert that we don't stomp the value in 'src'
-      // O3 is arbitrary because it's not used.
-      assert_different_registers(src, base, O3);
-      mov( t, O3);
-      st_ptr(O3, base, Interpreter::local_tag_offset_in_bytes(n));
-    }
-  }
-}
-
 
 void InterpreterMacroAssembler::store_local_int( Register index, Register src ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  debug_only(check_for_regarea_stomp(index, Interpreter::value_offset_in_bytes(), FP, G1_scratch, G4_scratch);)
-  tag_local(frame::TagValue, index, src);
-  st(src, index, Interpreter::value_offset_in_bytes());
+  debug_only(check_for_regarea_stomp(index, 0, FP, G1_scratch, G4_scratch);)
+  st(src, index, 0);
 }
 
-void InterpreterMacroAssembler::store_local_ptr( Register index, Register src,
-                                                 Register tag ) {
+void InterpreterMacroAssembler::store_local_ptr( Register index, Register src ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  #ifdef ASSERT
-  check_for_regarea_stomp(index, Interpreter::value_offset_in_bytes(), FP, G1_scratch, G4_scratch);
-  #endif
-  st_ptr(src, index, Interpreter::value_offset_in_bytes());
-  // Store tag register directly
-  if (TaggedStackInterpreter) {
-    st_ptr(tag, index, Interpreter::tag_offset_in_bytes());
-  }
+#ifdef ASSERT
+  check_for_regarea_stomp(index, 0, FP, G1_scratch, G4_scratch);
+#endif
+  st_ptr(src, index, 0);
 }
 
 
 
-void InterpreterMacroAssembler::store_local_ptr( int n, Register src,
-                                                 Register tag ) {
-  st_ptr(src,  Llocals, Interpreter::local_offset_in_bytes(n));
-  if (TaggedStackInterpreter) {
-    st_ptr(tag, Llocals, Interpreter::local_tag_offset_in_bytes(n));
-  }
+void InterpreterMacroAssembler::store_local_ptr( int n, Register src ) {
+  st_ptr(src, Llocals, Interpreter::local_offset_in_bytes(n));
 }
 
 void InterpreterMacroAssembler::store_local_long( Register index, Register src ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  #ifdef ASSERT
+#ifdef ASSERT
   check_for_regarea_stomp(index, Interpreter::local_offset_in_bytes(1), FP, G1_scratch, G4_scratch);
-  #endif
-  tag_local(frame::TagCategory2, index, src);
+#endif
   store_unaligned_long(src, index, Interpreter::local_offset_in_bytes(1)); // which is n+1
 }
 
 
 void InterpreterMacroAssembler::store_local_float( Register index, FloatRegister src ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  #ifdef ASSERT
-  check_for_regarea_stomp(index, Interpreter::value_offset_in_bytes(), FP, G1_scratch, G4_scratch);
-  #endif
-  tag_local(frame::TagValue, index, G1_scratch);
-  stf(FloatRegisterImpl::S, src, index, Interpreter::value_offset_in_bytes());
+#ifdef ASSERT
+  check_for_regarea_stomp(index, 0, FP, G1_scratch, G4_scratch);
+#endif
+  stf(FloatRegisterImpl::S, src, index, 0);
 }
 
 
 void InterpreterMacroAssembler::store_local_double( Register index, FloatRegister src ) {
   assert_not_delayed();
-  sll(index, Interpreter::logStackElementSize(), index);
+  sll(index, Interpreter::logStackElementSize, index);
   sub(Llocals, index, index);
-  #ifdef ASSERT
+#ifdef ASSERT
   check_for_regarea_stomp(index, Interpreter::local_offset_in_bytes(1), FP, G1_scratch, G4_scratch);
-  #endif
-  tag_local(frame::TagCategory2, index, G1_scratch);
+#endif
   store_unaligned_double(src, index, Interpreter::local_offset_in_bytes(1));
 }
 
--- a/src/cpu/sparc/vm/interp_masm_sparc.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/interp_masm_sparc.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -149,7 +149,6 @@
 
   void push_i(     Register r = Otos_i);
   void push_ptr(   Register r = Otos_i);
-  void push_ptr(   Register r, Register tag);
   void push_l(     Register r = Otos_l1);
   void push_f(FloatRegister f = Ftos_f);
   void push_d(FloatRegister f = Ftos_d1);
@@ -159,17 +158,9 @@
   void push(TosState state);           // transition state -> vtos
   void empty_expression_stack();       // resets both Lesp and SP
 
-  // Support for Tagged Stacks
-  void tag_stack(frame::Tag t, Register r);
-  void tag_stack(Register tag);
-  void tag_local(frame::Tag t, Register src, Register base, int n = 0);
-
 #ifdef ASSERT
   void verify_sp(Register Rsp, Register Rtemp);
   void verify_esp(Register Resp);      // verify that Lesp points to a word in the temp stack
-
-  void verify_stack_tag(frame::Tag t, Register r, Register scratch = G0);
-  void verify_local_tag(frame::Tag t, Register base, Register scr, int n = 0);
 #endif // ASSERT
 
  public:
@@ -242,17 +233,17 @@
   void check_for_regarea_stomp( Register Rindex, int offset, Register Rlimit, Register Rscratch, Register Rscratch1);
 #endif // ASSERT
   void store_local_int( Register index, Register src );
-  void store_local_ptr( Register index, Register src, Register tag = Otos_l2 );
-  void store_local_ptr( int n, Register src, Register tag = Otos_l2 );
+  void store_local_ptr( Register index, Register src );
+  void store_local_ptr( int n, Register src );
   void store_local_long( Register index, Register src );
   void store_local_float( Register index, FloatRegister src );
   void store_local_double( Register index, FloatRegister src );
 
-  // Tagged stack helpers for swap and dup
-  void load_ptr_and_tag(int n, Register val, Register tag);
-  void store_ptr_and_tag(int n, Register val, Register tag);
+  // Helpers for swap and dup
+  void load_ptr(int n, Register val);
+  void store_ptr(int n, Register val);
 
-  // Tagged stack helper for getting receiver in register.
+  // Helper for getting receiver in register.
   void load_receiver(Register param_count, Register recv);
 
   static int top_most_monitor_byte_offset(); // offset in bytes to top of monitor block
--- a/src/cpu/sparc/vm/interpreterRT_sparc.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/interpreterRT_sparc.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1998-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1998-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -43,19 +43,6 @@
   Argument  jni_arg(jni_offset(), false);
   Register  Rtmp = O0;
 
-#ifdef ASSERT
-  if (TaggedStackInterpreter) {
-    // check at least one tag is okay
-    Label ok;
-    __ ld_ptr(Llocals, Interpreter::local_tag_offset_in_bytes(offset() + 1), Rtmp);
-    __ cmp(Rtmp, G0);
-    __ brx(Assembler::equal, false, Assembler::pt, ok);
-    __ delayed()->nop();
-    __ stop("Native object has bad tag value");
-    __ bind(ok);
-  }
-#endif // ASSERT
-
 #ifdef _LP64
   __ ldx(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
   __ store_long_argument(Rtmp, jni_arg);
@@ -107,18 +94,6 @@
 
   Address     h_arg = Address(Llocals, Interpreter::local_offset_in_bytes(offset()));
   __ ld_ptr(h_arg, Rtmp1);
-#ifdef ASSERT
-  if (TaggedStackInterpreter) {
-    // check we have the obj and not the tag
-    Label ok;
-    __ mov(frame::TagReference, Rtmp3);
-    __ cmp(Rtmp1, Rtmp3);
-    __ brx(Assembler::notEqual, true, Assembler::pt, ok);
-    __ delayed()->nop();
-    __ stop("Native object passed tag by mistake");
-    __ bind(ok);
-  }
-#endif // ASSERT
   if (!do_NULL_check) {
     __ add(h_arg.base(), h_arg.disp(), Rtmp2);
   } else {
@@ -168,17 +143,9 @@
     long_sig   = 3
   };
 
-#ifdef ASSERT
-  void verify_tag(frame::Tag t) {
-    assert(!TaggedStackInterpreter ||
-           *(intptr_t*)(_from+Interpreter::local_tag_offset_in_bytes(0)) == t, "wrong tag");
-  }
-#endif // ASSERT
-
   virtual void pass_int() {
     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
     add_signature( non_float );
   }
 
@@ -186,31 +153,27 @@
     // pass address of from
     intptr_t *from_addr = (intptr_t*)(_from + Interpreter::local_offset_in_bytes(0));
     *_to++ = (*from_addr == 0) ? NULL : (intptr_t) from_addr;
-    debug_only(verify_tag(frame::TagReference));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
     add_signature( non_float );
    }
 
 #ifdef _LP64
   virtual void pass_float()  {
     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
     add_signature( float_sig );
    }
 
   virtual void pass_double() {
     *_to++ = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= 2*Interpreter::stackElementSize();
+    _from -= 2*Interpreter::stackElementSize;
    add_signature( double_sig );
    }
 
   virtual void pass_long() {
     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
-    debug_only(verify_tag(frame::TagValue));
     _to += 1;
-    _from -= 2*Interpreter::stackElementSize();
+    _from -= 2*Interpreter::stackElementSize;
     add_signature( long_sig );
   }
 #else
@@ -218,9 +181,8 @@
   virtual void pass_long() {
     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
     _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagValue));
     _to += 2;
-    _from -= 2*Interpreter::stackElementSize();
+    _from -= 2*Interpreter::stackElementSize;
     add_signature( non_float );
   }
 #endif // _LP64
--- a/src/cpu/sparc/vm/interpreter_sparc.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/interpreter_sparc.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -24,33 +24,13 @@
 
  public:
 
-  // Support for Tagged Stacks
+  static int expr_offset_in_bytes(int i) { return stackElementSize * i + wordSize; }
 
   // Stack index relative to tos (which points at value)
-  static int expr_index_at(int i)     {
-    return stackElementWords() * i;
-  }
-
-  static int expr_tag_index_at(int i) {
-    assert(TaggedStackInterpreter, "should not call this");
-    // tag is one word above java stack element
-    return stackElementWords() * i + 1;
-  }
-
-  static int expr_offset_in_bytes(int i) { return stackElementSize()*i + wordSize; }
-  static int expr_tag_offset_in_bytes (int i) {
-    assert(TaggedStackInterpreter, "should not call this");
-    return expr_offset_in_bytes(i) + wordSize;
-  }
+  static int expr_index_at(int i)        { return stackElementWords * i; }
 
   // Already negated by c++ interpreter
-  static int local_index_at(int i)     {
-    assert(i<=0, "local direction already negated");
-    return stackElementWords() * i + (value_offset_in_bytes()/wordSize);
+  static int local_index_at(int i) {
+    assert(i <= 0, "local direction already negated");
+    return stackElementWords * i;
   }
-
-  static int local_tag_index_at(int i) {
-    assert(i<=0, "local direction already negated");
-    assert(TaggedStackInterpreter, "should not call this");
-    return stackElementWords() * i + (tag_offset_in_bytes()/wordSize);
-  }
--- a/src/cpu/sparc/vm/methodHandles_sparc.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/methodHandles_sparc.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -358,7 +358,7 @@
 
       // Push arguments as if coming from the interpreter.
       Register O0_scratch = O0_argslot;
-      int stackElementSize = Interpreter::stackElementSize();
+      int stackElementSize = Interpreter::stackElementSize;
 
       // Make space on the stack for the arguments.
       __ sub(SP,    4*stackElementSize, SP);
@@ -679,7 +679,7 @@
       insert_arg_slots(_masm, stack_move_unit(), _INSERT_INT_MASK, O0_argslot, O1_scratch, O2_scratch, G5_index);
 
       Address arg_lsw(O0_argslot, 0);
-      Address arg_msw(O0_argslot, -Interpreter::stackElementSize());
+      Address arg_msw(O0_argslot, -Interpreter::stackElementSize);
 
       switch (ek) {
       case _adapter_opt_i2l:
--- a/src/cpu/sparc/vm/sharedRuntime_sparc.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/sharedRuntime_sparc.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -547,17 +547,11 @@
   void set_Rdisp(Register r)  { Rdisp = r; }
 
   void patch_callers_callsite();
-  void tag_c2i_arg(frame::Tag t, Register base, int st_off, Register scratch);
 
   // base+st_off points to top of argument
-  int arg_offset(const int st_off) { return st_off + Interpreter::value_offset_in_bytes(); }
+  int arg_offset(const int st_off) { return st_off; }
   int next_arg_offset(const int st_off) {
-    return st_off - Interpreter::stackElementSize() + Interpreter::value_offset_in_bytes();
-  }
-
-  int tag_offset(const int st_off) { return st_off + Interpreter::tag_offset_in_bytes(); }
-  int next_tag_offset(const int st_off) {
-    return st_off - Interpreter::stackElementSize() + Interpreter::tag_offset_in_bytes();
+    return st_off - Interpreter::stackElementSize;
   }
 
   // Argument slot values may be loaded first into a register because
@@ -565,9 +559,6 @@
   RegisterOrConstant arg_slot(const int st_off);
   RegisterOrConstant next_arg_slot(const int st_off);
 
-  RegisterOrConstant tag_slot(const int st_off);
-  RegisterOrConstant next_tag_slot(const int st_off);
-
   // Stores long into offset pointed to by base
   void store_c2i_long(Register r, Register base,
                       const int st_off, bool is_stack);
@@ -653,23 +644,6 @@
   __ bind(L);
 }
 
-void AdapterGenerator::tag_c2i_arg(frame::Tag t, Register base, int st_off,
-                 Register scratch) {
-  if (TaggedStackInterpreter) {
-    RegisterOrConstant slot = tag_slot(st_off);
-    // have to store zero because local slots can be reused (rats!)
-    if (t == frame::TagValue) {
-      __ st_ptr(G0, base, slot);
-    } else if (t == frame::TagCategory2) {
-      __ st_ptr(G0, base, slot);
-      __ st_ptr(G0, base, next_tag_slot(st_off));
-    } else {
-      __ mov(t, scratch);
-      __ st_ptr(scratch, base, slot);
-    }
-  }
-}
-
 
 RegisterOrConstant AdapterGenerator::arg_slot(const int st_off) {
   RegisterOrConstant roc(arg_offset(st_off));
@@ -682,17 +656,6 @@
 }
 
 
-RegisterOrConstant AdapterGenerator::tag_slot(const int st_off) {
-  RegisterOrConstant roc(tag_offset(st_off));
-  return __ ensure_simm13_or_reg(roc, Rdisp);
-}
-
-RegisterOrConstant AdapterGenerator::next_tag_slot(const int st_off) {
-  RegisterOrConstant roc(next_tag_offset(st_off));
-  return __ ensure_simm13_or_reg(roc, Rdisp);
-}
-
-
 // Stores long into offset pointed to by base
 void AdapterGenerator::store_c2i_long(Register r, Register base,
                                       const int st_off, bool is_stack) {
@@ -718,19 +681,16 @@
   }
 #endif // COMPILER2
 #endif // _LP64
-  tag_c2i_arg(frame::TagCategory2, base, st_off, r);
 }
 
 void AdapterGenerator::store_c2i_object(Register r, Register base,
                       const int st_off) {
   __ st_ptr (r, base, arg_slot(st_off));
-  tag_c2i_arg(frame::TagReference, base, st_off, r);
 }
 
 void AdapterGenerator::store_c2i_int(Register r, Register base,
                    const int st_off) {
   __ st (r, base, arg_slot(st_off));
-  tag_c2i_arg(frame::TagValue, base, st_off, r);
 }
 
 // Stores into offset pointed to by base
@@ -745,13 +705,11 @@
   __ stf(FloatRegisterImpl::S, r_1->as_FloatRegister(), base, next_arg_slot(st_off));
   __ stf(FloatRegisterImpl::S, r_2->as_FloatRegister(), base, arg_slot(st_off) );
 #endif
-  tag_c2i_arg(frame::TagCategory2, base, st_off, G1_scratch);
 }
 
 void AdapterGenerator::store_c2i_float(FloatRegister f, Register base,
                                        const int st_off) {
   __ stf(FloatRegisterImpl::S, f, base, arg_slot(st_off));
-  tag_c2i_arg(frame::TagValue, base, st_off, G1_scratch);
 }
 
 void AdapterGenerator::gen_c2i_adapter(
@@ -786,14 +744,14 @@
   // Since all args are passed on the stack, total_args_passed*wordSize is the
   // space we need.  Add in varargs area needed by the interpreter. Round up
   // to stack alignment.
-  const int arg_size = total_args_passed * Interpreter::stackElementSize();
+  const int arg_size = total_args_passed * Interpreter::stackElementSize;
   const int varargs_area =
                  (frame::varargs_offset - frame::register_save_words)*wordSize;
   const int extraspace = round_to(arg_size + varargs_area, 2*wordSize);
 
   int bias = STACK_BIAS;
   const int interp_arg_offset = frame::varargs_offset*wordSize +
-                        (total_args_passed-1)*Interpreter::stackElementSize();
+                        (total_args_passed-1)*Interpreter::stackElementSize;
 
   Register base = SP;
 
@@ -814,7 +772,7 @@
 
   // First write G1 (if used) to where ever it must go
   for (int i=0; i<total_args_passed; i++) {
-    const int st_off = interp_arg_offset - (i*Interpreter::stackElementSize()) + bias;
+    const int st_off = interp_arg_offset - (i*Interpreter::stackElementSize) + bias;
     VMReg r_1 = regs[i].first();
     VMReg r_2 = regs[i].second();
     if (r_1 == G1_scratch->as_VMReg()) {
@@ -831,7 +789,7 @@
 
   // Now write the args into the outgoing interpreter space
   for (int i=0; i<total_args_passed; i++) {
-    const int st_off = interp_arg_offset - (i*Interpreter::stackElementSize()) + bias;
+    const int st_off = interp_arg_offset - (i*Interpreter::stackElementSize) + bias;
     VMReg r_1 = regs[i].first();
     VMReg r_2 = regs[i].second();
     if (!r_1->is_valid()) {
@@ -900,7 +858,7 @@
 #endif // _LP64
 
   __ mov((frame::varargs_offset)*wordSize -
-         1*Interpreter::stackElementSize()+bias+BytesPerWord, G1);
+         1*Interpreter::stackElementSize+bias+BytesPerWord, G1);
   // Jump to the interpreter just as if interpreter was doing it.
   __ jmpl(G3_scratch, 0, G0);
   // Setup Lesp for the call.  Cannot actually set Lesp as the current Lesp
@@ -1051,7 +1009,7 @@
     // ldx/lddf optimizations.
 
     // Load in argument order going down.
-    const int ld_off = (total_args_passed-i)*Interpreter::stackElementSize();
+    const int ld_off = (total_args_passed-i)*Interpreter::stackElementSize;
     set_Rdisp(G1_scratch);
 
     VMReg r_1 = regs[i].first();
@@ -1120,7 +1078,7 @@
   for (int i=0; i<total_args_passed; i++) {
     if (regs[i].first()->is_Register() && regs[i].second()->is_valid()) {
       // Load in argument order going down
-      int ld_off = (total_args_passed-i)*Interpreter::stackElementSize();
+      int ld_off = (total_args_passed-i)*Interpreter::stackElementSize;
       // Need to marshal 64-bit value from misaligned Lesp loads
       Register r = regs[i].first()->as_Register()->after_restore();
       if (r == G1 || r == G4) {
@@ -3062,7 +3020,7 @@
           "test and remove; got more parms than locals");
   if (callee_locals < callee_parameters)
     return 0;                   // No adjustment for negative locals
-  int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords();
+  int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords;
   return round_to(diff, WordsPerLong);
 }
 
--- a/src/cpu/sparc/vm/stubGenerator_sparc.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/stubGenerator_sparc.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -139,7 +139,7 @@
       __ ld_ptr(parameter_size.as_address(), t);                // get parameter size (in words)
       __ add(t, frame::memory_parameter_word_sp_offset, t);     // add space for save area (in words)
       __ round_to(t, WordsPerLong);                             // make sure it is multiple of 2 (in words)
-      __ sll(t, Interpreter::logStackElementSize(), t);                    // compute number of bytes
+      __ sll(t, Interpreter::logStackElementSize, t);           // compute number of bytes
       __ neg(t);                                                // negate so it can be used with save
       __ save(SP, t, SP);                                       // setup new frame
     }
@@ -191,19 +191,13 @@
       // copy parameters if any
       Label loop;
       __ BIND(loop);
-      // Store tag first.
-      if (TaggedStackInterpreter) {
-        __ ld_ptr(src, 0, tmp);
-        __ add(src, BytesPerWord, src);  // get next
-        __ st_ptr(tmp, dst, Interpreter::tag_offset_in_bytes());
-      }
       // Store parameter value
       __ ld_ptr(src, 0, tmp);
       __ add(src, BytesPerWord, src);
-      __ st_ptr(tmp, dst, Interpreter::value_offset_in_bytes());
+      __ st_ptr(tmp, dst, 0);
       __ deccc(cnt);
       __ br(Assembler::greater, false, Assembler::pt, loop);
-      __ delayed()->sub(dst, Interpreter::stackElementSize(), dst);
+      __ delayed()->sub(dst, Interpreter::stackElementSize, dst);
 
       // done
       __ BIND(exit);
@@ -220,7 +214,7 @@
     // setup parameters
     const Register t = G3_scratch;
     __ ld_ptr(parameter_size.as_in().as_address(), t); // get parameter size (in words)
-    __ sll(t, Interpreter::logStackElementSize(), t);            // compute number of bytes
+    __ sll(t, Interpreter::logStackElementSize, t);    // compute number of bytes
     __ sub(FP, t, Gargs);                              // setup parameter pointer
 #ifdef _LP64
     __ add( Gargs, STACK_BIAS, Gargs );                // Account for LP64 stack bias
--- a/src/cpu/sparc/vm/templateInterpreter_sparc.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/templateInterpreter_sparc.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -197,7 +197,7 @@
   __ ld_ptr(cache, constantPoolCacheOopDesc::base_offset() +
                    ConstantPoolCacheEntry::flags_offset(), size);
   __ and3(size, 0xFF, size);                   // argument size in words
-  __ sll(size, Interpreter::logStackElementSize(), size); // each argument size in bytes
+  __ sll(size, Interpreter::logStackElementSize, size); // each argument size in bytes
   __ add(Lesp, size, Lesp);                    // pop arguments
   __ dispatch_next(state, step);
 
@@ -495,7 +495,7 @@
   // Set the saved SP after the register window save
   //
   assert_different_registers(Gargs, Glocals_size, Gframe_size, O5_savedSP);
-  __ sll(Glocals_size, Interpreter::logStackElementSize(), Otmp1);
+  __ sll(Glocals_size, Interpreter::logStackElementSize, Otmp1);
   __ add(Gargs, Otmp1, Gargs);
 
   if (native_call) {
@@ -511,7 +511,7 @@
     __ lduh( size_of_locals, Otmp1 );
     __ sub( Otmp1, Glocals_size, Glocals_size );
     __ round_to( Glocals_size, WordsPerLong );
-    __ sll( Glocals_size, Interpreter::logStackElementSize(), Glocals_size );
+    __ sll( Glocals_size, Interpreter::logStackElementSize, Glocals_size );
 
     // see if the frame is greater than one page in size. If so,
     // then we need to verify there is enough stack space remaining
@@ -519,7 +519,7 @@
     __ lduh( max_stack, Gframe_size );
     __ add( Gframe_size, extra_space, Gframe_size );
     __ round_to( Gframe_size, WordsPerLong );
-    __ sll( Gframe_size, Interpreter::logStackElementSize(), Gframe_size);
+    __ sll( Gframe_size, Interpreter::logStackElementSize, Gframe_size);
 
     // Add in java locals size for stack overflow check only
     __ add( Gframe_size, Glocals_size, Gframe_size );
@@ -1234,8 +1234,8 @@
   // be updated!
   __ lduh( size_of_locals, O2 );
   __ lduh( size_of_parameters, O1 );
-  __ sll( O2, Interpreter::logStackElementSize(), O2);
-  __ sll( O1, Interpreter::logStackElementSize(), O1 );
+  __ sll( O2, Interpreter::logStackElementSize, O2);
+  __ sll( O1, Interpreter::logStackElementSize, O1 );
   __ sub( Llocals, O2, O2 );
   __ sub( Llocals, O1, O1 );
 
@@ -1470,8 +1470,8 @@
        round_to(frame::interpreter_frame_vm_local_words,WordsPerLong);
   // callee_locals and max_stack are counts, not the size in frame.
   const int locals_size =
-       round_to(callee_extra_locals * Interpreter::stackElementWords(), WordsPerLong);
-  const int max_stack_words = max_stack * Interpreter::stackElementWords();
+       round_to(callee_extra_locals * Interpreter::stackElementWords, WordsPerLong);
+  const int max_stack_words = max_stack * Interpreter::stackElementWords;
   return (round_to((max_stack_words
                    //6815692//+ methodOopDesc::extra_stack_words()
                    + rounded_vm_local_words
@@ -1570,11 +1570,11 @@
 
     // preallocate stack space
     intptr_t*  esp = monitors - 1 -
-                     (tempcount * Interpreter::stackElementWords()) -
+                     (tempcount * Interpreter::stackElementWords) -
                      popframe_extra_args;
 
-    int local_words = method->max_locals() * Interpreter::stackElementWords();
-    int parm_words  = method->size_of_parameters() * Interpreter::stackElementWords();
+    int local_words = method->max_locals() * Interpreter::stackElementWords;
+    int parm_words  = method->size_of_parameters() * Interpreter::stackElementWords;
     NEEDS_CLEANUP;
     intptr_t* locals;
     if (caller->is_interpreted_frame()) {
@@ -1662,7 +1662,7 @@
     BasicObjectLock* mp = (BasicObjectLock*)monitors;
 
     assert(interpreter_frame->interpreter_frame_method() == method, "method matches");
-    assert(interpreter_frame->interpreter_frame_local_at(9) == (intptr_t *)((intptr_t)locals - (9 * Interpreter::stackElementSize())+Interpreter::value_offset_in_bytes()), "locals match");
+    assert(interpreter_frame->interpreter_frame_local_at(9) == (intptr_t *)((intptr_t)locals - (9 * Interpreter::stackElementSize)), "locals match");
     assert(interpreter_frame->interpreter_frame_monitor_end()   == mp, "monitor_end matches");
     assert(((intptr_t *)interpreter_frame->interpreter_frame_monitor_begin()) == ((intptr_t *)mp)+monitor_size, "monitor_begin matches");
     assert(interpreter_frame->interpreter_frame_tos_address()-1 == esp, "esp matches");
@@ -1758,7 +1758,7 @@
 
     // Compute size of arguments for saving when returning to deoptimized caller
     __ lduh(Lmethod, in_bytes(methodOopDesc::size_of_parameters_offset()), Gtmp1);
-    __ sll(Gtmp1, Interpreter::logStackElementSize(), Gtmp1);
+    __ sll(Gtmp1, Interpreter::logStackElementSize, Gtmp1);
     __ sub(Llocals, Gtmp1, Gtmp2);
     __ add(Gtmp2, wordSize, Gtmp2);
     // Save these arguments
--- a/src/cpu/sparc/vm/templateInterpreter_sparc.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/templateInterpreter_sparc.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -29,7 +29,8 @@
   // fail with a guarantee ("not enough space for interpreter generation");
   // if too small.
   // Run with +PrintInterpreter to get the VM to print out the size.
-  // Max size with JVMTI and TaggedStackInterpreter
+  // Max size with JVMTI
+
 #ifdef _LP64
   // The sethi() instruction generates lots more instructions when shell
   // stack limit is unlimited, so that's why this is much bigger.
--- a/src/cpu/sparc/vm/templateTable_sparc.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/sparc/vm/templateTable_sparc.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -580,7 +580,6 @@
 
 void TemplateTable::iload(int n) {
   transition(vtos, itos);
-  debug_only(__ verify_local_tag(frame::TagValue, Llocals, Otos_i, n));
   __ ld( Llocals, Interpreter::local_offset_in_bytes(n), Otos_i );
 }
 
@@ -588,7 +587,6 @@
 void TemplateTable::lload(int n) {
   transition(vtos, ltos);
   assert(n+1 < Argument::n_register_parameters, "would need more code");
-  debug_only(__ verify_local_tag(frame::TagCategory2, Llocals, Otos_l, n));
   __ load_unaligned_long(Llocals, Interpreter::local_offset_in_bytes(n+1), Otos_l);
 }
 
@@ -596,7 +594,6 @@
 void TemplateTable::fload(int n) {
   transition(vtos, ftos);
   assert(n < Argument::n_register_parameters, "would need more code");
-  debug_only(__ verify_local_tag(frame::TagValue, Llocals, G3_scratch, n));
   __ ldf( FloatRegisterImpl::S, Llocals, Interpreter::local_offset_in_bytes(n),     Ftos_f );
 }
 
@@ -604,14 +601,12 @@
 void TemplateTable::dload(int n) {
   transition(vtos, dtos);
   FloatRegister dst = Ftos_d;
-  debug_only(__ verify_local_tag(frame::TagCategory2, Llocals, G3_scratch, n));
   __ load_unaligned_double(Llocals, Interpreter::local_offset_in_bytes(n+1), dst);
 }
 
 
 void TemplateTable::aload(int n) {
   transition(vtos, atos);
-  debug_only(__ verify_local_tag(frame::TagReference, Llocals, Otos_i, n));
   __ ld_ptr( Llocals, Interpreter::local_offset_in_bytes(n), Otos_i );
 }
 
@@ -707,12 +702,11 @@
 
 void TemplateTable::astore() {
   transition(vtos, vtos);
-  // astore tos can also be a returnAddress, so load and store the tag too
-  __ load_ptr_and_tag(0, Otos_i, Otos_l2);
-  __ inc(Lesp, Interpreter::stackElementSize());
+  __ load_ptr(0, Otos_i);
+  __ inc(Lesp, Interpreter::stackElementSize);
   __ verify_oop_or_return_address(Otos_i, G3_scratch);
   locals_index(G3_scratch);
-  __ store_local_ptr( G3_scratch, Otos_i, Otos_l2 );
+  __ store_local_ptr(G3_scratch, Otos_i);
 }
 
 
@@ -750,12 +744,11 @@
 
 void TemplateTable::wide_astore() {
   transition(vtos, vtos);
-  // astore tos can also be a returnAddress, so load and store the tag too
-  __ load_ptr_and_tag(0, Otos_i, Otos_l2);
-  __ inc(Lesp, Interpreter::stackElementSize());
+  __ load_ptr(0, Otos_i);
+  __ inc(Lesp, Interpreter::stackElementSize);
   __ verify_oop_or_return_address(Otos_i, G3_scratch);
   locals_index_wide(G3_scratch);
-  __ store_local_ptr( G3_scratch, Otos_i, Otos_l2 );
+  __ store_local_ptr(G3_scratch, Otos_i);
 }
 
 
@@ -845,13 +838,13 @@
   do_oop_store(_masm, O1, noreg, arrayOopDesc::base_offset_in_bytes(T_OBJECT), Otos_i, G3_scratch, _bs->kind(), true);
 
   __ ba(false,done);
-  __ delayed()->inc(Lesp, 3* Interpreter::stackElementSize()); // adj sp (pops array, index and value)
+  __ delayed()->inc(Lesp, 3* Interpreter::stackElementSize); // adj sp (pops array, index and value)
 
   __ bind(is_null);
   do_oop_store(_masm, O1, noreg, arrayOopDesc::base_offset_in_bytes(T_OBJECT), G0, G4_scratch, _bs->kind(), true);
 
   __ profile_null_seen(G3_scratch);
-  __ inc(Lesp, 3* Interpreter::stackElementSize());     // adj sp (pops array, index and value)
+  __ inc(Lesp, 3* Interpreter::stackElementSize);     // adj sp (pops array, index and value)
   __ bind(done);
 }
 
@@ -884,7 +877,6 @@
 
 void TemplateTable::istore(int n) {
   transition(itos, vtos);
-  __ tag_local(frame::TagValue, Llocals, Otos_i, n);
   __ st(Otos_i, Llocals, Interpreter::local_offset_in_bytes(n));
 }
 
@@ -892,7 +884,6 @@
 void TemplateTable::lstore(int n) {
   transition(ltos, vtos);
   assert(n+1 < Argument::n_register_parameters, "only handle register cases");
-  __ tag_local(frame::TagCategory2, Llocals, Otos_l, n);
   __ store_unaligned_long(Otos_l, Llocals, Interpreter::local_offset_in_bytes(n+1));
 
 }
@@ -901,7 +892,6 @@
 void TemplateTable::fstore(int n) {
   transition(ftos, vtos);
   assert(n < Argument::n_register_parameters, "only handle register cases");
-  __ tag_local(frame::TagValue, Llocals, Otos_l, n);
   __ stf(FloatRegisterImpl::S, Ftos_f, Llocals, Interpreter::local_offset_in_bytes(n));
 }
 
@@ -909,30 +899,28 @@
 void TemplateTable::dstore(int n) {
   transition(dtos, vtos);
   FloatRegister src = Ftos_d;
-  __ tag_local(frame::TagCategory2, Llocals, Otos_l, n);
   __ store_unaligned_double(src, Llocals, Interpreter::local_offset_in_bytes(n+1));
 }
 
 
 void TemplateTable::astore(int n) {
   transition(vtos, vtos);
-  // astore tos can also be a returnAddress, so load and store the tag too
-  __ load_ptr_and_tag(0, Otos_i, Otos_l2);
-  __ inc(Lesp, Interpreter::stackElementSize());
+  __ load_ptr(0, Otos_i);
+  __ inc(Lesp, Interpreter::stackElementSize);
   __ verify_oop_or_return_address(Otos_i, G3_scratch);
-  __ store_local_ptr( n, Otos_i, Otos_l2 );
+  __ store_local_ptr(n, Otos_i);
 }
 
 
 void TemplateTable::pop() {
   transition(vtos, vtos);
-  __ inc(Lesp, Interpreter::stackElementSize());
+  __ inc(Lesp, Interpreter::stackElementSize);
 }
 
 
 void TemplateTable::pop2() {
   transition(vtos, vtos);
-  __ inc(Lesp, 2 * Interpreter::stackElementSize());
+  __ inc(Lesp, 2 * Interpreter::stackElementSize);
 }
 
 
@@ -940,8 +928,8 @@
   transition(vtos, vtos);
   // stack: ..., a
   // load a and tag
-  __ load_ptr_and_tag(0, Otos_i, Otos_l2);
-  __ push_ptr(Otos_i, Otos_l2);
+  __ load_ptr(0, Otos_i);
+  __ push_ptr(Otos_i);
   // stack: ..., a, a
 }
 
@@ -949,11 +937,11 @@
 void TemplateTable::dup_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b
-  __ load_ptr_and_tag(1, G3_scratch, G4_scratch);   // get a
-  __ load_ptr_and_tag(0, Otos_l1, Otos_l2);         // get b
-  __ store_ptr_and_tag(1, Otos_l1, Otos_l2);        // put b
-  __ store_ptr_and_tag(0, G3_scratch, G4_scratch);  // put a - like swap
-  __ push_ptr(Otos_l1, Otos_l2);                    // push b
+  __ load_ptr( 1, G3_scratch);  // get a
+  __ load_ptr( 0, Otos_l1);     // get b
+  __ store_ptr(1, Otos_l1);     // put b
+  __ store_ptr(0, G3_scratch);  // put a - like swap
+  __ push_ptr(Otos_l1);         // push b
   // stack: ..., b, a, b
 }
 
@@ -962,27 +950,27 @@
   transition(vtos, vtos);
   // stack: ..., a, b, c
   // get c and push on stack, reuse registers
-  __ load_ptr_and_tag(0, G3_scratch, G4_scratch);     // get c
-  __ push_ptr(G3_scratch, G4_scratch);               // push c with tag
+  __ load_ptr( 0, G3_scratch);  // get c
+  __ push_ptr(G3_scratch);      // push c with tag
   // stack: ..., a, b, c, c  (c in reg)  (Lesp - 4)
   // (stack offsets n+1 now)
-  __ load_ptr_and_tag(3, Otos_l1, Otos_l2);          // get a
-  __ store_ptr_and_tag(3, G3_scratch, G4_scratch);   // put c at 3
+  __ load_ptr( 3, Otos_l1);     // get a
+  __ store_ptr(3, G3_scratch);  // put c at 3
   // stack: ..., c, b, c, c  (a in reg)
-  __ load_ptr_and_tag(2, G3_scratch, G4_scratch);    // get b
-  __ store_ptr_and_tag(2, Otos_l1, Otos_l2);         // put a at 2
+  __ load_ptr( 2, G3_scratch);  // get b
+  __ store_ptr(2, Otos_l1);     // put a at 2
   // stack: ..., c, a, c, c  (b in reg)
-  __ store_ptr_and_tag(1, G3_scratch, G4_scratch);   // put b at 1
+  __ store_ptr(1, G3_scratch);  // put b at 1
   // stack: ..., c, a, b, c
 }
 
 
 void TemplateTable::dup2() {
   transition(vtos, vtos);
-  __ load_ptr_and_tag(1, G3_scratch, G4_scratch);     // get a
-  __ load_ptr_and_tag(0, Otos_l1, Otos_l2);           // get b
-  __ push_ptr(G3_scratch, G4_scratch);                // push a
-  __ push_ptr(Otos_l1, Otos_l2);                      // push b
+  __ load_ptr(1, G3_scratch);  // get a
+  __ load_ptr(0, Otos_l1);     // get b
+  __ push_ptr(G3_scratch);     // push a
+  __ push_ptr(Otos_l1);        // push b
   // stack: ..., a, b, a, b
 }
 
@@ -990,17 +978,17 @@
 void TemplateTable::dup2_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b, c
-  __ load_ptr_and_tag(1, Lscratch, G1_scratch);       // get b
-  __ load_ptr_and_tag(2, Otos_l1, Otos_l2);           // get a
-  __ store_ptr_and_tag(2, Lscratch, G1_scratch);      // put b at a
+  __ load_ptr( 1, Lscratch);    // get b
+  __ load_ptr( 2, Otos_l1);     // get a
+  __ store_ptr(2, Lscratch);    // put b at a
   // stack: ..., b, b, c
-  __ load_ptr_and_tag(0, G3_scratch, G4_scratch);     // get c
-  __ store_ptr_and_tag(1, G3_scratch, G4_scratch);    // put c at b
+  __ load_ptr( 0, G3_scratch);  // get c
+  __ store_ptr(1, G3_scratch);  // put c at b
   // stack: ..., b, c, c
-  __ store_ptr_and_tag(0, Otos_l1, Otos_l2);          // put a at c
+  __ store_ptr(0, Otos_l1);     // put a at c
   // stack: ..., b, c, a
-  __ push_ptr(Lscratch, G1_scratch);                  // push b
-  __ push_ptr(G3_scratch, G4_scratch);                // push c
+  __ push_ptr(Lscratch);        // push b
+  __ push_ptr(G3_scratch);      // push c
   // stack: ..., b, c, a, b, c
 }
 
@@ -1010,18 +998,18 @@
 void TemplateTable::dup2_x2() {
   transition(vtos, vtos);
   // stack: ..., a, b, c, d
-  __ load_ptr_and_tag(1, Lscratch, G1_scratch);       // get c
-  __ load_ptr_and_tag(3, Otos_l1, Otos_l2);           // get a
-  __ store_ptr_and_tag(3, Lscratch, G1_scratch);      // put c at 3
-  __ store_ptr_and_tag(1, Otos_l1, Otos_l2);          // put a at 1
+  __ load_ptr( 1, Lscratch);    // get c
+  __ load_ptr( 3, Otos_l1);     // get a
+  __ store_ptr(3, Lscratch);    // put c at 3
+  __ store_ptr(1, Otos_l1);     // put a at 1
   // stack: ..., c, b, a, d
-  __ load_ptr_and_tag(2, G3_scratch, G4_scratch);     // get b
-  __ load_ptr_and_tag(0, Otos_l1, Otos_l2);           // get d
-  __ store_ptr_and_tag(0, G3_scratch, G4_scratch);    // put b at 0
-  __ store_ptr_and_tag(2, Otos_l1, Otos_l2);          // put d at 2
+  __ load_ptr( 2, G3_scratch);  // get b
+  __ load_ptr( 0, Otos_l1);     // get d
+  __ store_ptr(0, G3_scratch);  // put b at 0
+  __ store_ptr(2, Otos_l1);     // put d at 2
   // stack: ..., c, d, a, b
-  __ push_ptr(Lscratch, G1_scratch);                  // push c
-  __ push_ptr(Otos_l1, Otos_l2);                      // push d
+  __ push_ptr(Lscratch);        // push c
+  __ push_ptr(Otos_l1);         // push d
   // stack: ..., c, d, a, b, c, d
 }
 
@@ -1029,10 +1017,10 @@
 void TemplateTable::swap() {
   transition(vtos, vtos);
   // stack: ..., a, b
-  __ load_ptr_and_tag(1, G3_scratch, G4_scratch);     // get a
-  __ load_ptr_and_tag(0, Otos_l1, Otos_l2);           // get b
-  __ store_ptr_and_tag(0, G3_scratch, G4_scratch);    // put b
-  __ store_ptr_and_tag(1, Otos_l1, Otos_l2);          // put a
+  __ load_ptr( 1, G3_scratch);  // get a
+  __ load_ptr( 0, Otos_l1);     // get b
+  __ store_ptr(0, G3_scratch);  // put b
+  __ store_ptr(1, Otos_l1);     // put a
   // stack: ..., b, a
 }
 
@@ -1045,9 +1033,9 @@
    case  sub:  __  sub(O1, Otos_i, Otos_i);  break;
      // %%%%% Mul may not exist: better to call .mul?
    case  mul:  __ smul(O1, Otos_i, Otos_i);  break;
-   case _and:  __  and3(O1, Otos_i, Otos_i);  break;
-   case  _or:  __   or3(O1, Otos_i, Otos_i);  break;
-   case _xor:  __  xor3(O1, Otos_i, Otos_i);  break;
+   case _and:  __ and3(O1, Otos_i, Otos_i);  break;
+   case  _or:  __  or3(O1, Otos_i, Otos_i);  break;
+   case _xor:  __ xor3(O1, Otos_i, Otos_i);  break;
    case  shl:  __  sll(O1, Otos_i, Otos_i);  break;
    case  shr:  __  sra(O1, Otos_i, Otos_i);  break;
    case ushr:  __  srl(O1, Otos_i, Otos_i);  break;
@@ -1061,17 +1049,17 @@
   __ pop_l(O2);
   switch (op) {
 #ifdef _LP64
-   case  add:  __ add(O2, Otos_l, Otos_l);  break;
-   case  sub:  __ sub(O2, Otos_l, Otos_l);  break;
-   case _and:  __ and3( O2, Otos_l, Otos_l);  break;
-   case  _or:  __  or3( O2, Otos_l, Otos_l);  break;
-   case _xor:  __ xor3( O2, Otos_l, Otos_l);  break;
+   case  add:  __  add(O2, Otos_l, Otos_l);  break;
+   case  sub:  __  sub(O2, Otos_l, Otos_l);  break;
+   case _and:  __ and3(O2, Otos_l, Otos_l);  break;
+   case  _or:  __  or3(O2, Otos_l, Otos_l);  break;
+   case _xor:  __ xor3(O2, Otos_l, Otos_l);  break;
 #else
    case  add:  __ addcc(O3, Otos_l2, Otos_l2);  __ addc(O2, Otos_l1, Otos_l1);  break;
    case  sub:  __ subcc(O3, Otos_l2, Otos_l2);  __ subc(O2, Otos_l1, Otos_l1);  break;
-   case _and:  __ and3(  O3, Otos_l2, Otos_l2);  __ and3( O2, Otos_l1, Otos_l1);  break;
-   case  _or:  __  or3(  O3, Otos_l2, Otos_l2);  __  or3( O2, Otos_l1, Otos_l1);  break;
-   case _xor:  __ xor3(  O3, Otos_l2, Otos_l2);  __ xor3( O2, Otos_l1, Otos_l1);  break;
+   case _and:  __  and3(O3, Otos_l2, Otos_l2);  __ and3(O2, Otos_l1, Otos_l1);  break;
+   case  _or:  __   or3(O3, Otos_l2, Otos_l2);  __  or3(O2, Otos_l1, Otos_l1);  break;
+   case _xor:  __  xor3(O3, Otos_l2, Otos_l2);  __ xor3(O2, Otos_l1, Otos_l1);  break;
 #endif
    default: ShouldNotReachHere();
   }
@@ -1307,7 +1295,7 @@
   __ ldsb(Lbcp, 2, O2);  // load constant
   __ access_local_int(G3_scratch, Otos_i);
   __ add(Otos_i, O2, Otos_i);
-  __ st(Otos_i, G3_scratch, Interpreter::value_offset_in_bytes());    // access_local_int puts E.A. in G3_scratch
+  __ st(Otos_i, G3_scratch, 0);    // access_local_int puts E.A. in G3_scratch
 }
 
 
@@ -1317,7 +1305,7 @@
   __ get_2_byte_integer_at_bcp( 4,  O2, O3, InterpreterMacroAssembler::Signed);
   __ access_local_int(G3_scratch, Otos_i);
   __ add(Otos_i, O3, Otos_i);
-  __ st(Otos_i, G3_scratch, Interpreter::value_offset_in_bytes());    // access_local_int puts E.A. in G3_scratch
+  __ st(Otos_i, G3_scratch, 0);    // access_local_int puts E.A. in G3_scratch
 }
 
 
@@ -1555,7 +1543,7 @@
     // Bump Lbcp to target of JSR
     __ add(Lbcp, O1_disp, Lbcp);
     // Push returnAddress for "ret" on stack
-    __ push_ptr(Otos_i, G0); // push ptr sized thing plus 0 for tag.
+    __ push_ptr(Otos_i);
     // And away we go!
     __ dispatch_next(vtos);
     return;
@@ -2754,7 +2742,7 @@
   Register Rflags  = G4_scratch;
   Register Rreceiver = Lscratch;
 
-  __ ld_ptr(Llocals, Interpreter::value_offset_in_bytes(), Rreceiver);
+  __ ld_ptr(Llocals, 0, Rreceiver);
 
   // access constant pool cache  (is resolved)
   __ get_cache_and_index_at_bcp(Rcache, G4_scratch, 2);
@@ -3696,7 +3684,7 @@
   transition(vtos, atos);
      // put ndims * wordSize into Lscratch
   __ ldub( Lbcp,     3,               Lscratch);
-  __ sll(  Lscratch, Interpreter::logStackElementSize(), Lscratch);
+  __ sll(  Lscratch, Interpreter::logStackElementSize, Lscratch);
      // Lesp points past last_dim, so set to O1 to first_dim address
   __ add(  Lesp,     Lscratch,        O1);
      call_VM(Otos_i, CAST_FROM_FN_PTR(address, InterpreterRuntime::multianewarray), O1);
--- a/src/cpu/x86/vm/assembler_x86.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/assembler_x86.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -7740,7 +7740,7 @@
 Address MacroAssembler::argument_address(RegisterOrConstant arg_slot,
                                          int extra_slot_offset) {
   // cf. TemplateTable::prepare_invoke(), if (load_receiver).
-  int stackElementSize = Interpreter::stackElementSize();
+  int stackElementSize = Interpreter::stackElementSize;
   int offset = Interpreter::expr_offset_in_bytes(extra_slot_offset+0);
 #ifdef ASSERT
   int offset1 = Interpreter::expr_offset_in_bytes(extra_slot_offset+1);
--- a/src/cpu/x86/vm/cppInterpreter_x86.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/cppInterpreter_x86.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -28,6 +28,6 @@
   // Size of interpreter code.  Increase if too small.  Interpreter will
   // fail with a guarantee ("not enough space for interpreter generation");
   // if too small.
-  // Run with +PrintInterpreterSize to get the VM to print out the size.
-  // Max size with JVMTI and TaggedStackInterpreter
+  // Run with +PrintInterpreter to get the VM to print out the size.
+  // Max size with JVMTI
   const static int InterpreterCodeSize = 168 * 1024;
--- a/src/cpu/x86/vm/frame_x86.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/frame_x86.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -502,7 +502,7 @@
   // When unpacking an optimized frame the frame pointer is
   // adjusted with:
   int diff = (method->max_locals() - method->size_of_parameters()) *
-             Interpreter::stackElementWords();
+             Interpreter::stackElementWords;
   return _fp == (fp - diff);
 }
 
@@ -542,7 +542,7 @@
 
   // stack frames shouldn't be much larger than max_stack elements
 
-  if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize()) {
+  if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
     return false;
   }
 
@@ -594,7 +594,7 @@
 #ifdef AMD64
       // This is times two because we do a push(ltos) after pushing XMM0
       // and that takes two interpreter stack slots.
-      tos_addr += 2 * Interpreter::stackElementWords();
+      tos_addr += 2 * Interpreter::stackElementWords;
 #else
       tos_addr += 2;
 #endif // AMD64
--- a/src/cpu/x86/vm/interp_masm_x86_32.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/interp_masm_x86_32.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -265,89 +265,30 @@
 
 // Java Expression Stack
 
-#ifdef ASSERT
-void InterpreterMacroAssembler::verify_stack_tag(frame::Tag t) {
-  if (TaggedStackInterpreter) {
-    Label okay;
-    cmpptr(Address(rsp, wordSize), (int32_t)t);
-    jcc(Assembler::equal, okay);
-    // Also compare if the stack value is zero, then the tag might
-    // not have been set coming from deopt.
-    cmpptr(Address(rsp, 0), 0);
-    jcc(Assembler::equal, okay);
-    stop("Java Expression stack tag value is bad");
-    bind(okay);
-  }
-}
-#endif // ASSERT
-
 void InterpreterMacroAssembler::pop_ptr(Register r) {
-  debug_only(verify_stack_tag(frame::TagReference));
   pop(r);
-  if (TaggedStackInterpreter) addptr(rsp, 1 * wordSize);
-}
-
-void InterpreterMacroAssembler::pop_ptr(Register r, Register tag) {
-  pop(r);
-  // Tag may not be reference for jsr, can be returnAddress
-  if (TaggedStackInterpreter) pop(tag);
 }
 
 void InterpreterMacroAssembler::pop_i(Register r) {
-  debug_only(verify_stack_tag(frame::TagValue));
   pop(r);
-  if (TaggedStackInterpreter) addptr(rsp, 1 * wordSize);
 }
 
 void InterpreterMacroAssembler::pop_l(Register lo, Register hi) {
-  debug_only(verify_stack_tag(frame::TagValue));
   pop(lo);
-  if (TaggedStackInterpreter) addptr(rsp, 1 * wordSize);
-  debug_only(verify_stack_tag(frame::TagValue));
   pop(hi);
-  if (TaggedStackInterpreter) addptr(rsp, 1 * wordSize);
 }
 
 void InterpreterMacroAssembler::pop_f() {
-  debug_only(verify_stack_tag(frame::TagValue));
   fld_s(Address(rsp, 0));
   addptr(rsp, 1 * wordSize);
-  if (TaggedStackInterpreter) addptr(rsp, 1 * wordSize);
 }
 
 void InterpreterMacroAssembler::pop_d() {
-  // Write double to stack contiguously and load into ST0
-  pop_dtos_to_rsp();
   fld_d(Address(rsp, 0));
   addptr(rsp, 2 * wordSize);
 }
 
 
-// Pop the top of the java expression stack to execution stack (which
-// happens to be the same place).
-void InterpreterMacroAssembler::pop_dtos_to_rsp() {
-  if (TaggedStackInterpreter) {
-    // Pop double value into scratch registers
-    debug_only(verify_stack_tag(frame::TagValue));
-    pop(rax);
-    addptr(rsp, 1* wordSize);
-    debug_only(verify_stack_tag(frame::TagValue));
-    pop(rdx);
-    addptr(rsp, 1* wordSize);
-    push(rdx);
-    push(rax);
-  }
-}
-
-void InterpreterMacroAssembler::pop_ftos_to_rsp() {
-  if (TaggedStackInterpreter) {
-    debug_only(verify_stack_tag(frame::TagValue));
-    pop(rax);
-    addptr(rsp, 1 * wordSize);
-    push(rax);  // ftos is at rsp
-  }
-}
-
 void InterpreterMacroAssembler::pop(TosState state) {
   switch (state) {
     case atos: pop_ptr(rax);                                 break;
@@ -365,54 +306,28 @@
 }
 
 void InterpreterMacroAssembler::push_ptr(Register r) {
-  if (TaggedStackInterpreter) push(frame::TagReference);
-  push(r);
-}
-
-void InterpreterMacroAssembler::push_ptr(Register r, Register tag) {
-  if (TaggedStackInterpreter) push(tag);  // tag first
   push(r);
 }
 
 void InterpreterMacroAssembler::push_i(Register r) {
-  if (TaggedStackInterpreter) push(frame::TagValue);
   push(r);
 }
 
 void InterpreterMacroAssembler::push_l(Register lo, Register hi) {
-  if (TaggedStackInterpreter) push(frame::TagValue);
   push(hi);
-  if (TaggedStackInterpreter) push(frame::TagValue);
   push(lo);
 }
 
 void InterpreterMacroAssembler::push_f() {
-  if (TaggedStackInterpreter) push(frame::TagValue);
   // Do not schedule for no AGI! Never write beyond rsp!
   subptr(rsp, 1 * wordSize);
   fstp_s(Address(rsp, 0));
 }
 
 void InterpreterMacroAssembler::push_d(Register r) {
-  if (TaggedStackInterpreter) {
-    // Double values are stored as:
-    //   tag
-    //   high
-    //   tag
-    //   low
-    push(frame::TagValue);
-    subptr(rsp, 3 * wordSize);
-    fstp_d(Address(rsp, 0));
-    // move high word up to slot n-1
-    movl(r, Address(rsp, 1*wordSize));
-    movl(Address(rsp, 2*wordSize), r);
-    // move tag
-    movl(Address(rsp, 1*wordSize), frame::TagValue);
-  } else {
-    // Do not schedule for no AGI! Never write beyond rsp!
-    subptr(rsp, 2 * wordSize);
-    fstp_d(Address(rsp, 0));
-  }
+  // Do not schedule for no AGI! Never write beyond rsp!
+  subptr(rsp, 2 * wordSize);
+  fstp_d(Address(rsp, 0));
 }
 
 
@@ -433,118 +348,15 @@
 }
 
 
-// Tagged stack helpers for swap and dup
-void InterpreterMacroAssembler::load_ptr_and_tag(int n, Register val,
-                                                 Register tag) {
+// Helpers for swap and dup
+void InterpreterMacroAssembler::load_ptr(int n, Register val) {
   movptr(val, Address(rsp, Interpreter::expr_offset_in_bytes(n)));
-  if (TaggedStackInterpreter) {
-    movptr(tag, Address(rsp, Interpreter::expr_tag_offset_in_bytes(n)));
-  }
 }
 
-void InterpreterMacroAssembler::store_ptr_and_tag(int n, Register val,
-                                                  Register tag) {
+void InterpreterMacroAssembler::store_ptr(int n, Register val) {
   movptr(Address(rsp, Interpreter::expr_offset_in_bytes(n)), val);
-  if (TaggedStackInterpreter) {
-    movptr(Address(rsp, Interpreter::expr_tag_offset_in_bytes(n)), tag);
-  }
 }
 
-
-// Tagged local support
-void InterpreterMacroAssembler::tag_local(frame::Tag tag, int n) {
-  if (TaggedStackInterpreter) {
-    if (tag == frame::TagCategory2) {
-      movptr(Address(rdi, Interpreter::local_tag_offset_in_bytes(n+1)), (int32_t)frame::TagValue);
-      movptr(Address(rdi, Interpreter::local_tag_offset_in_bytes(n)), (int32_t)frame::TagValue);
-    } else {
-      movptr(Address(rdi, Interpreter::local_tag_offset_in_bytes(n)), (int32_t)tag);
-    }
-  }
-}
-
-void InterpreterMacroAssembler::tag_local(frame::Tag tag, Register idx) {
-  if (TaggedStackInterpreter) {
-    if (tag == frame::TagCategory2) {
-      movptr(Address(rdi, idx, Interpreter::stackElementScale(),
-                  Interpreter::local_tag_offset_in_bytes(1)), (int32_t)frame::TagValue);
-      movptr(Address(rdi, idx, Interpreter::stackElementScale(),
-                    Interpreter::local_tag_offset_in_bytes(0)), (int32_t)frame::TagValue);
-    } else {
-      movptr(Address(rdi, idx, Interpreter::stackElementScale(),
-                               Interpreter::local_tag_offset_in_bytes(0)), (int32_t)tag);
-    }
-  }
-}
-
-void InterpreterMacroAssembler::tag_local(Register tag, Register idx) {
-  if (TaggedStackInterpreter) {
-    // can only be TagValue or TagReference
-    movptr(Address(rdi, idx, Interpreter::stackElementScale(),
-                           Interpreter::local_tag_offset_in_bytes(0)), tag);
-  }
-}
-
-
-void InterpreterMacroAssembler::tag_local(Register tag, int n) {
-  if (TaggedStackInterpreter) {
-    // can only be TagValue or TagReference
-    movptr(Address(rdi, Interpreter::local_tag_offset_in_bytes(n)), tag);
-  }
-}
-
-#ifdef ASSERT
-void InterpreterMacroAssembler::verify_local_tag(frame::Tag tag, int n) {
-  if (TaggedStackInterpreter) {
-     frame::Tag t = tag;
-    if (tag == frame::TagCategory2) {
-      Label nbl;
-      t = frame::TagValue;  // change to what is stored in locals
-      cmpptr(Address(rdi, Interpreter::local_tag_offset_in_bytes(n+1)), (int32_t)t);
-      jcc(Assembler::equal, nbl);
-      stop("Local tag is bad for long/double");
-      bind(nbl);
-    }
-    Label notBad;
-    cmpptr(Address(rdi, Interpreter::local_tag_offset_in_bytes(n)), (int32_t)t);
-    jcc(Assembler::equal, notBad);
-    // Also compare if the local value is zero, then the tag might
-    // not have been set coming from deopt.
-    cmpptr(Address(rdi, Interpreter::local_offset_in_bytes(n)), 0);
-    jcc(Assembler::equal, notBad);
-    stop("Local tag is bad");
-    bind(notBad);
-  }
-}
-
-void InterpreterMacroAssembler::verify_local_tag(frame::Tag tag, Register idx) {
-  if (TaggedStackInterpreter) {
-    frame::Tag t = tag;
-    if (tag == frame::TagCategory2) {
-      Label nbl;
-      t = frame::TagValue;  // change to what is stored in locals
-      cmpptr(Address(rdi, idx, Interpreter::stackElementScale(),
-                  Interpreter::local_tag_offset_in_bytes(1)), (int32_t)t);
-      jcc(Assembler::equal, nbl);
-      stop("Local tag is bad for long/double");
-      bind(nbl);
-    }
-    Label notBad;
-    cmpl(Address(rdi, idx, Interpreter::stackElementScale(),
-                  Interpreter::local_tag_offset_in_bytes(0)), (int32_t)t);
-    jcc(Assembler::equal, notBad);
-    // Also compare if the local value is zero, then the tag might
-    // not have been set coming from deopt.
-    cmpptr(Address(rdi, idx, Interpreter::stackElementScale(),
-                  Interpreter::local_offset_in_bytes(0)), 0);
-    jcc(Assembler::equal, notBad);
-    stop("Local tag is bad");
-    bind(notBad);
-
-  }
-}
-#endif // ASSERT
-
 void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point) {
   MacroAssembler::call_VM_leaf_base(entry_point, 0);
 }
--- a/src/cpu/x86/vm/interp_masm_x86_32.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/interp_masm_x86_32.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -85,16 +85,12 @@
   void d2ieee();                                           // truncate dtos to 64bits
 
   void pop_ptr(Register r = rax);
-  void pop_ptr(Register r, Register tag);
   void pop_i(Register r = rax);
   void pop_l(Register lo = rax, Register hi = rdx);
   void pop_f();
   void pop_d();
-  void pop_ftos_to_rsp();
-  void pop_dtos_to_rsp();
 
   void push_ptr(Register r = rax);
-  void push_ptr(Register r, Register tag);
   void push_i(Register r = rax);
   void push_l(Register lo = rax, Register hi = rdx);
   void push_d(Register r = rax);
@@ -112,33 +108,15 @@
   void pop(void* v ); // Add unimplemented ambiguous method
   void push(void* v );   // Add unimplemented ambiguous method
 
-  DEBUG_ONLY(void verify_stack_tag(frame::Tag t);)
-
-#endif // CC_INTERP
-
-#ifndef CC_INTERP
-
-  void empty_expression_stack()                            {
-       movptr(rsp, Address(rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize));
-      // NULL last_sp until next java call
-      movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);
+  void empty_expression_stack() {
+    movptr(rsp, Address(rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize));
+    // NULL last_sp until next java call
+    movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD);
   }
 
-  // Tagged stack helpers for swap and dup
-  void load_ptr_and_tag(int n, Register val, Register tag);
-  void store_ptr_and_tag(int n, Register val, Register tag);
-
-  // Tagged Local support
-
-  void tag_local(frame::Tag tag, int n);
-  void tag_local(Register tag, int n);
-  void tag_local(frame::Tag tag, Register idx);
-  void tag_local(Register tag, Register idx);
-
-#ifdef ASSERT
-  void verify_local_tag(frame::Tag tag, int n);
-  void verify_local_tag(frame::Tag tag, Register idx);
-#endif // ASSERT
+  // Helpers for swap and dup
+  void load_ptr(int n, Register val);
+  void store_ptr(int n, Register val);
 
   // Super call_VM calls - correspond to MacroAssembler::call_VM(_leaf) calls
   void super_call_VM_leaf(address entry_point);
--- a/src/cpu/x86/vm/interp_masm_x86_64.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/interp_masm_x86_64.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -264,113 +264,51 @@
 
 // Java Expression Stack
 
-#ifdef ASSERT
-// Verifies that the stack tag matches.  Must be called before the stack
-// value is popped off the stack.
-void InterpreterMacroAssembler::verify_stack_tag(frame::Tag t) {
-  if (TaggedStackInterpreter) {
-    frame::Tag tag = t;
-    if (t == frame::TagCategory2) {
-      tag = frame::TagValue;
-      Label hokay;
-      cmpptr(Address(rsp, 3*wordSize), (int32_t)tag);
-      jcc(Assembler::equal, hokay);
-      stop("Java Expression stack tag high value is bad");
-      bind(hokay);
-    }
-    Label okay;
-    cmpptr(Address(rsp, wordSize), (int32_t)tag);
-    jcc(Assembler::equal, okay);
-    // Also compare if the stack value is zero, then the tag might
-    // not have been set coming from deopt.
-    cmpptr(Address(rsp, 0), 0);
-    jcc(Assembler::equal, okay);
-    stop("Java Expression stack tag value is bad");
-    bind(okay);
-  }
-}
-#endif // ASSERT
-
 void InterpreterMacroAssembler::pop_ptr(Register r) {
-  debug_only(verify_stack_tag(frame::TagReference));
   pop(r);
-  if (TaggedStackInterpreter) addptr(rsp, 1 * wordSize);
-}
-
-void InterpreterMacroAssembler::pop_ptr(Register r, Register tag) {
-  pop(r);
-  if (TaggedStackInterpreter) pop(tag);
 }
 
 void InterpreterMacroAssembler::pop_i(Register r) {
   // XXX can't use pop currently, upper half non clean
-  debug_only(verify_stack_tag(frame::TagValue));
   movl(r, Address(rsp, 0));
   addptr(rsp, wordSize);
-  if (TaggedStackInterpreter) addptr(rsp, 1 * wordSize);
 }
 
 void InterpreterMacroAssembler::pop_l(Register r) {
-  debug_only(verify_stack_tag(frame::TagCategory2));
   movq(r, Address(rsp, 0));
-  addptr(rsp, 2 * Interpreter::stackElementSize());
+  addptr(rsp, 2 * Interpreter::stackElementSize);
 }
 
 void InterpreterMacroAssembler::pop_f(XMMRegister r) {
-  debug_only(verify_stack_tag(frame::TagValue));
   movflt(r, Address(rsp, 0));
   addptr(rsp, wordSize);
-  if (TaggedStackInterpreter) addptr(rsp, 1 * wordSize);
 }
 
 void InterpreterMacroAssembler::pop_d(XMMRegister r) {
-  debug_only(verify_stack_tag(frame::TagCategory2));
   movdbl(r, Address(rsp, 0));
-  addptr(rsp, 2 * Interpreter::stackElementSize());
+  addptr(rsp, 2 * Interpreter::stackElementSize);
 }
 
 void InterpreterMacroAssembler::push_ptr(Register r) {
-  if (TaggedStackInterpreter) push(frame::TagReference);
-  push(r);
-}
-
-void InterpreterMacroAssembler::push_ptr(Register r, Register tag) {
-  if (TaggedStackInterpreter) push(tag);
   push(r);
 }
 
 void InterpreterMacroAssembler::push_i(Register r) {
-  if (TaggedStackInterpreter) push(frame::TagValue);
   push(r);
 }
 
 void InterpreterMacroAssembler::push_l(Register r) {
-  if (TaggedStackInterpreter) {
-    push(frame::TagValue);
-    subptr(rsp, 1 * wordSize);
-    push(frame::TagValue);
-    subptr(rsp, 1 * wordSize);
-  } else {
-    subptr(rsp, 2 * wordSize);
-  }
+  subptr(rsp, 2 * wordSize);
   movq(Address(rsp, 0), r);
 }
 
 void InterpreterMacroAssembler::push_f(XMMRegister r) {
-  if (TaggedStackInterpreter) push(frame::TagValue);
   subptr(rsp, wordSize);
   movflt(Address(rsp, 0), r);
 }
 
 void InterpreterMacroAssembler::push_d(XMMRegister r) {
-  if (TaggedStackInterpreter) {
-    push(frame::TagValue);
-    subptr(rsp, 1 * wordSize);
-    push(frame::TagValue);
-    subptr(rsp, 1 * wordSize);
-  } else {
-    subptr(rsp, 2 * wordSize);
-  }
+  subptr(rsp, 2 * wordSize);
   movdbl(Address(rsp, 0), r);
 }
 
@@ -407,118 +345,16 @@
 }
 
 
-
-
-// Tagged stack helpers for swap and dup
-void InterpreterMacroAssembler::load_ptr_and_tag(int n, Register val,
-                                                 Register tag) {
+// Helpers for swap and dup
+void InterpreterMacroAssembler::load_ptr(int n, Register val) {
   movptr(val, Address(rsp, Interpreter::expr_offset_in_bytes(n)));
-  if (TaggedStackInterpreter) {
-    movptr(tag, Address(rsp, Interpreter::expr_tag_offset_in_bytes(n)));
-  }
 }
 
-void InterpreterMacroAssembler::store_ptr_and_tag(int n, Register val,
-                                                  Register tag) {
+void InterpreterMacroAssembler::store_ptr(int n, Register val) {
   movptr(Address(rsp, Interpreter::expr_offset_in_bytes(n)), val);
-  if (TaggedStackInterpreter) {
-    movptr(Address(rsp, Interpreter::expr_tag_offset_in_bytes(n)), tag);
-  }
 }
 
 
-// Tagged local support
-void InterpreterMacroAssembler::tag_local(frame::Tag tag, int n) {
-  if (TaggedStackInterpreter) {
-    if (tag == frame::TagCategory2) {
-      movptr(Address(r14, Interpreter::local_tag_offset_in_bytes(n+1)),
-           (int32_t)frame::TagValue);
-      movptr(Address(r14, Interpreter::local_tag_offset_in_bytes(n)),
-           (int32_t)frame::TagValue);
-    } else {
-      movptr(Address(r14, Interpreter::local_tag_offset_in_bytes(n)), (int32_t)tag);
-    }
-  }
-}
-
-void InterpreterMacroAssembler::tag_local(frame::Tag tag, Register idx) {
-  if (TaggedStackInterpreter) {
-    if (tag == frame::TagCategory2) {
-      movptr(Address(r14, idx, Address::times_8,
-                  Interpreter::local_tag_offset_in_bytes(1)), (int32_t)frame::TagValue);
-      movptr(Address(r14, idx, Address::times_8,
-                  Interpreter::local_tag_offset_in_bytes(0)), (int32_t)frame::TagValue);
-    } else {
-      movptr(Address(r14, idx, Address::times_8, Interpreter::local_tag_offset_in_bytes(0)),
-           (int32_t)tag);
-    }
-  }
-}
-
-void InterpreterMacroAssembler::tag_local(Register tag, Register idx) {
-  if (TaggedStackInterpreter) {
-    // can only be TagValue or TagReference
-    movptr(Address(r14, idx, Address::times_8, Interpreter::local_tag_offset_in_bytes(0)), tag);
-  }
-}
-
-
-void InterpreterMacroAssembler::tag_local(Register tag, int n) {
-  if (TaggedStackInterpreter) {
-    // can only be TagValue or TagReference
-    movptr(Address(r14, Interpreter::local_tag_offset_in_bytes(n)), tag);
-  }
-}
-
-#ifdef ASSERT
-void InterpreterMacroAssembler::verify_local_tag(frame::Tag tag, int n) {
-  if (TaggedStackInterpreter) {
-     frame::Tag t = tag;
-    if (tag == frame::TagCategory2) {
-      Label nbl;
-      t = frame::TagValue;  // change to what is stored in locals
-      cmpptr(Address(r14, Interpreter::local_tag_offset_in_bytes(n+1)), (int32_t)t);
-      jcc(Assembler::equal, nbl);
-      stop("Local tag is bad for long/double");
-      bind(nbl);
-    }
-    Label notBad;
-    cmpq(Address(r14, Interpreter::local_tag_offset_in_bytes(n)), (int32_t)t);
-    jcc(Assembler::equal, notBad);
-    // Also compare if the local value is zero, then the tag might
-    // not have been set coming from deopt.
-    cmpptr(Address(r14, Interpreter::local_offset_in_bytes(n)), 0);
-    jcc(Assembler::equal, notBad);
-    stop("Local tag is bad");
-    bind(notBad);
-  }
-}
-
-void InterpreterMacroAssembler::verify_local_tag(frame::Tag tag, Register idx) {
-  if (TaggedStackInterpreter) {
-    frame::Tag t = tag;
-    if (tag == frame::TagCategory2) {
-      Label nbl;
-      t = frame::TagValue;  // change to what is stored in locals
-      cmpptr(Address(r14, idx, Address::times_8, Interpreter::local_tag_offset_in_bytes(1)), (int32_t)t);
-      jcc(Assembler::equal, nbl);
-      stop("Local tag is bad for long/double");
-      bind(nbl);
-    }
-    Label notBad;
-    cmpptr(Address(r14, idx, Address::times_8, Interpreter::local_tag_offset_in_bytes(0)), (int32_t)t);
-    jcc(Assembler::equal, notBad);
-    // Also compare if the local value is zero, then the tag might
-    // not have been set coming from deopt.
-    cmpptr(Address(r14, idx, Address::times_8, Interpreter::local_offset_in_bytes(0)), 0);
-    jcc(Assembler::equal, notBad);
-    stop("Local tag is bad");
-    bind(notBad);
-  }
-}
-#endif // ASSERT
-
-
 void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point) {
   MacroAssembler::call_VM_leaf_base(entry_point, 0);
 }
--- a/src/cpu/x86/vm/interp_masm_x86_64.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/interp_masm_x86_64.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -120,38 +120,16 @@
   void pop(TosState state); // transition vtos -> state
   void push(TosState state); // transition state -> vtos
 
-  // Tagged stack support, pop and push both tag and value.
-  void pop_ptr(Register r, Register tag);
-  void push_ptr(Register r, Register tag);
-#endif // CC_INTERP
-
-  DEBUG_ONLY(void verify_stack_tag(frame::Tag t);)
-
-#ifndef CC_INTERP
-
-  // Tagged stack helpers for swap and dup
-  void load_ptr_and_tag(int n, Register val, Register tag);
-  void store_ptr_and_tag(int n, Register val, Register tag);
-
-  // Tagged Local support
-  void tag_local(frame::Tag tag, int n);
-  void tag_local(Register tag, int n);
-  void tag_local(frame::Tag tag, Register idx);
-  void tag_local(Register tag, Register idx);
-
-#ifdef ASSERT
-  void verify_local_tag(frame::Tag tag, int n);
-  void verify_local_tag(frame::Tag tag, Register idx);
-#endif // ASSERT
-
-
-  void empty_expression_stack()
-  {
+  void empty_expression_stack() {
     movptr(rsp, Address(rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize));
     // NULL last_sp until next java call
     movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
   }
 
+  // Helpers for swap and dup
+  void load_ptr(int n, Register val);
+  void store_ptr(int n, Register val);
+
   // Super call_VM calls - correspond to MacroAssembler::call_VM(_leaf) calls
   void super_call_VM_leaf(address entry_point);
   void super_call_VM_leaf(address entry_point, Register arg_1);
--- a/src/cpu/x86/vm/interpreterRT_x86_32.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/interpreterRT_x86_32.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1998-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1998-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -86,33 +86,23 @@
   address   _from;
   intptr_t* _to;
 
-#ifdef ASSERT
-  void verify_tag(frame::Tag t) {
-    assert(!TaggedStackInterpreter ||
-           *(intptr_t*)(_from+Interpreter::local_tag_offset_in_bytes(0)) == t, "wrong tag");
-  }
-#endif // ASSERT
-
   virtual void pass_int() {
     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
   }
 
   virtual void pass_long() {
     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
     _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagValue));
     _to += 2;
-    _from -= 2*Interpreter::stackElementSize();
+    _from -= 2*Interpreter::stackElementSize;
   }
 
   virtual void pass_object() {
     // pass address of from
     intptr_t from_addr = (intptr_t)(_from + Interpreter::local_offset_in_bytes(0));
     *_to++ = (*(intptr_t*)from_addr == 0) ? NULL_WORD : from_addr;
-    debug_only(verify_tag(frame::TagReference));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
    }
 
  public:
--- a/src/cpu/x86/vm/interpreterRT_x86_64.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/interpreterRT_x86_64.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -293,18 +293,10 @@
   intptr_t* _fp_identifiers;
   unsigned int _num_args;
 
-#ifdef ASSERT
-  void verify_tag(frame::Tag t) {
-    assert(!TaggedStackInterpreter ||
-           *(intptr_t*)(_from+Interpreter::local_tag_offset_in_bytes(0)) == t, "wrong tag");
-  }
-#endif // ASSERT
-
   virtual void pass_int()
   {
     jint from_obj = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
 
     if (_num_args < Argument::n_int_register_parameters_c-1) {
       *_reg_args++ = from_obj;
@@ -317,8 +309,7 @@
   virtual void pass_long()
   {
     intptr_t from_obj = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= 2*Interpreter::stackElementSize();
+    _from -= 2*Interpreter::stackElementSize;
 
     if (_num_args < Argument::n_int_register_parameters_c-1) {
       *_reg_args++ = from_obj;
@@ -331,8 +322,7 @@
   virtual void pass_object()
   {
     intptr_t *from_addr = (intptr_t*)(_from + Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagReference));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
     if (_num_args < Argument::n_int_register_parameters_c-1) {
       *_reg_args++ = (*from_addr == 0) ? NULL : (intptr_t) from_addr;
       _num_args++;
@@ -344,8 +334,7 @@
   virtual void pass_float()
   {
     jint from_obj = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
 
     if (_num_args < Argument::n_float_register_parameters_c-1) {
       *_reg_args++ = from_obj;
@@ -359,8 +348,7 @@
   virtual void pass_double()
   {
     intptr_t from_obj = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= 2*Interpreter::stackElementSize();
+    _from -= 2*Interpreter::stackElementSize;
 
     if (_num_args < Argument::n_float_register_parameters_c-1) {
       *_reg_args++ = from_obj;
@@ -397,18 +385,10 @@
   unsigned int _num_int_args;
   unsigned int _num_fp_args;
 
-#ifdef ASSERT
-  void verify_tag(frame::Tag t) {
-    assert(!TaggedStackInterpreter ||
-           *(intptr_t*)(_from+Interpreter::local_tag_offset_in_bytes(0)) == t, "wrong tag");
-  }
-#endif // ASSERT
-
   virtual void pass_int()
   {
     jint from_obj = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
 
     if (_num_int_args < Argument::n_int_register_parameters_c-1) {
       *_int_args++ = from_obj;
@@ -421,8 +401,7 @@
   virtual void pass_long()
   {
     intptr_t from_obj = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= 2*Interpreter::stackElementSize();
+    _from -= 2*Interpreter::stackElementSize;
 
     if (_num_int_args < Argument::n_int_register_parameters_c-1) {
       *_int_args++ = from_obj;
@@ -435,8 +414,7 @@
   virtual void pass_object()
   {
     intptr_t *from_addr = (intptr_t*)(_from + Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagReference));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
 
     if (_num_int_args < Argument::n_int_register_parameters_c-1) {
       *_int_args++ = (*from_addr == 0) ? NULL : (intptr_t)from_addr;
@@ -449,8 +427,7 @@
   virtual void pass_float()
   {
     jint from_obj = *(jint*)(_from+Interpreter::local_offset_in_bytes(0));
-    debug_only(verify_tag(frame::TagValue));
-    _from -= Interpreter::stackElementSize();
+    _from -= Interpreter::stackElementSize;
 
     if (_num_fp_args < Argument::n_float_register_parameters_c) {
       *_fp_args++ = from_obj;
@@ -463,7 +440,7 @@
   virtual void pass_double()
   {
     intptr_t from_obj = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
-    _from -= 2*Interpreter::stackElementSize();
+    _from -= 2*Interpreter::stackElementSize;
 
     if (_num_fp_args < Argument::n_float_register_parameters_c) {
       *_fp_args++ = from_obj;
--- a/src/cpu/x86/vm/interpreter_x86.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/interpreter_x86.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -31,39 +31,16 @@
   // the fpu stack.
   static const int return_sentinel;
 
-
-  static Address::ScaleFactor stackElementScale() {
-    return TaggedStackInterpreter? Address::times_8 : Address::times_4;
-  }
+  static Address::ScaleFactor stackElementScale() { return Address::times_4; }
 
   // Offset from rsp (which points to the last stack element)
-  static int expr_offset_in_bytes(int i) { return stackElementSize()*i ; }
-  static int expr_tag_offset_in_bytes(int i) {
-    assert(TaggedStackInterpreter, "should not call this");
-    return expr_offset_in_bytes(i) + wordSize;
-  }
-
-  // Support for Tagged Stacks
+  static int expr_offset_in_bytes(int i) { return stackElementSize * i; }
 
   // Stack index relative to tos (which points at value)
-  static int expr_index_at(int i)     {
-    return stackElementWords() * i;
-  }
-
-  static int expr_tag_index_at(int i) {
-    assert(TaggedStackInterpreter, "should not call this");
-    // tag is one word above java stack element
-    return stackElementWords() * i + 1;
-  }
+  static int expr_index_at(int i)        { return stackElementWords * i; }
 
   // Already negated by c++ interpreter
-  static int local_index_at(int i)     {
-    assert(i<=0, "local direction already negated");
-    return stackElementWords() * i + (value_offset_in_bytes()/wordSize);
+  static int local_index_at(int i) {
+    assert(i <= 0, "local direction already negated");
+    return stackElementWords * i;
   }
-
-  static int local_tag_index_at(int i) {
-    assert(i<=0, "local direction already negated");
-    assert(TaggedStackInterpreter, "should not call this");
-    return stackElementWords() * i + (tag_offset_in_bytes()/wordSize);
-  }
--- a/src/cpu/x86/vm/interpreter_x86_32.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/interpreter_x86_32.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -131,14 +131,7 @@
   //       java methods.  Interpreter::method_kind(...) will select
   //       this entry point for the corresponding methods in JDK 1.3.
   // get argument
-  if (TaggedStackInterpreter) {
-    __ pushl(Address(rsp, 3*wordSize));  // push hi (and note rsp -= wordSize)
-    __ pushl(Address(rsp, 2*wordSize));  // push lo
-    __ fld_d(Address(rsp, 0));           // get double in ST0
-    __ addptr(rsp, 2*wordSize);
-  } else {
-    __ fld_d(Address(rsp, 1*wordSize));
-  }
+  __ fld_d(Address(rsp, 1*wordSize));
   switch (kind) {
     case Interpreter::java_lang_math_sin :
         __ trigfunc('s');
--- a/src/cpu/x86/vm/methodHandles_x86.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/methodHandles_x86.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -500,7 +500,7 @@
 #ifndef _LP64
         if (arg_slots == 2) {
           __ movl(rdx_temp, prim_value_addr.plus_disp(wordSize));
-          __ movl(Address(rax_argslot, Interpreter::stackElementSize()), rdx_temp);
+          __ movl(Address(rax_argslot, Interpreter::stackElementSize), rdx_temp);
         }
 #endif //_LP64
       }
@@ -596,7 +596,7 @@
           __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
           remove_arg_slots(_masm, -stack_move_unit(),
                            rax_argslot, rbx_temp, rdx_temp);
-          vmarg = Address(rax_argslot, -Interpreter::stackElementSize());
+          vmarg = Address(rax_argslot, -Interpreter::stackElementSize);
           __ movl(rdx_temp, vmarg);
         }
         break;
@@ -665,8 +665,8 @@
       __ lea(rax_argslot, __ argument_address(rax_argslot, 1));
       insert_arg_slots(_masm, stack_move_unit(), _INSERT_INT_MASK,
                        rax_argslot, rbx_temp, rdx_temp);
-      Address vmarg1(rax_argslot, -Interpreter::stackElementSize());
-      Address vmarg2 = vmarg1.plus_disp(Interpreter::stackElementSize());
+      Address vmarg1(rax_argslot, -Interpreter::stackElementSize);
+      Address vmarg2 = vmarg1.plus_disp(Interpreter::stackElementSize);
 
       switch (ek) {
       case _adapter_opt_i2l:
@@ -718,7 +718,7 @@
         insert_arg_slots(_masm, stack_move_unit(), _INSERT_INT_MASK,
                          rax_argslot, rbx_temp, rdx_temp);
       }
-      Address vmarg(rax_argslot, -Interpreter::stackElementSize());
+      Address vmarg(rax_argslot, -Interpreter::stackElementSize);
 
 #ifdef _LP64
       if (ek == _adapter_opt_f2d) {
@@ -1016,7 +1016,7 @@
       // Array length checks out.  Now insert any required stack slots.
       if (length_constant == -1) {
         // Form a pointer to the end of the affected region.
-        __ lea(rdx_argslot_limit, Address(rax_argslot, Interpreter::stackElementSize()));
+        __ lea(rdx_argslot_limit, Address(rax_argslot, Interpreter::stackElementSize));
         // 'stack_move' is negative number of words to insert
         Register rdi_stack_move = rdi;
         __ movl2ptr(rdi_stack_move, rcx_amh_conversion);
@@ -1054,7 +1054,7 @@
         __ movptr(rbx_temp, Address(rsi_source, 0));
         __ movptr(Address(rax_argslot, 0), rbx_temp);
         __ addptr(rsi_source, type2aelembytes(elem_type));
-        __ addptr(rax_argslot, Interpreter::stackElementSize());
+        __ addptr(rax_argslot, Interpreter::stackElementSize);
         __ cmpptr(rax_argslot, rdx_argslot_limit);
         __ jccb(Assembler::less, loop);
       } else if (length_constant == 0) {
@@ -1067,7 +1067,7 @@
           __ movptr(rbx_temp, Address(rsi_array, elem_offset));
           __ movptr(Address(rax_argslot, slot_offset), rbx_temp);
           elem_offset += type2aelembytes(elem_type);
-           slot_offset += Interpreter::stackElementSize();
+           slot_offset += Interpreter::stackElementSize;
         }
       }
 
--- a/src/cpu/x86/vm/sharedRuntime_x86_32.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/sharedRuntime_x86_32.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -503,34 +503,9 @@
 }
 
 
-// Helper function to put tags in interpreter stack.
-static void  tag_stack(MacroAssembler *masm, const BasicType sig, int st_off) {
-  if (TaggedStackInterpreter) {
-    int tag_offset = st_off + Interpreter::expr_tag_offset_in_bytes(0);
-    if (sig == T_OBJECT || sig == T_ARRAY) {
-      __ movptr(Address(rsp, tag_offset), frame::TagReference);
-    } else if (sig == T_LONG || sig == T_DOUBLE) {
-      int next_tag_offset = st_off + Interpreter::expr_tag_offset_in_bytes(1);
-      __ movptr(Address(rsp, next_tag_offset), frame::TagValue);
-      __ movptr(Address(rsp, tag_offset), frame::TagValue);
-    } else {
-      __ movptr(Address(rsp, tag_offset), frame::TagValue);
-    }
-  }
-}
-
-// Double and long values with Tagged stacks are not contiguous.
 static void move_c2i_double(MacroAssembler *masm, XMMRegister r, int st_off) {
-  int next_off = st_off - Interpreter::stackElementSize();
-  if (TaggedStackInterpreter) {
-   __ movdbl(Address(rsp, next_off), r);
-   // Move top half up and put tag in the middle.
-   __ movl(rdi, Address(rsp, next_off+wordSize));
-   __ movl(Address(rsp, st_off), rdi);
-   tag_stack(masm, T_DOUBLE, next_off);
-  } else {
-   __ movdbl(Address(rsp, next_off), r);
-  }
+  int next_off = st_off - Interpreter::stackElementSize;
+  __ movdbl(Address(rsp, next_off), r);
 }
 
 static void gen_c2i_adapter(MacroAssembler *masm,
@@ -560,7 +535,7 @@
   // Since all args are passed on the stack, total_args_passed * interpreter_
   // stack_element_size  is the
   // space we need.
-  int extraspace = total_args_passed * Interpreter::stackElementSize();
+  int extraspace = total_args_passed * Interpreter::stackElementSize;
 
   // Get return address
   __ pop(rax);
@@ -578,8 +553,8 @@
     }
 
     // st_off points to lowest address on stack.
-    int st_off = ((total_args_passed - 1) - i) * Interpreter::stackElementSize();
-    int next_off = st_off - Interpreter::stackElementSize();
+    int st_off = ((total_args_passed - 1) - i) * Interpreter::stackElementSize;
+    int next_off = st_off - Interpreter::stackElementSize;
 
     // Say 4 args:
     // i   st_off
@@ -601,7 +576,6 @@
       if (!r_2->is_valid()) {
         __ movl(rdi, Address(rsp, ld_off));
         __ movptr(Address(rsp, st_off), rdi);
-        tag_stack(masm, sig_bt[i], st_off);
       } else {
 
         // ld_off == LSW, ld_off+VMRegImpl::stack_slot_size == MSW
@@ -619,13 +593,11 @@
         __ movptr(Address(rsp, st_off), rax);
 #endif /* ASSERT */
 #endif // _LP64
-        tag_stack(masm, sig_bt[i], next_off);
       }
     } else if (r_1->is_Register()) {
       Register r = r_1->as_Register();
       if (!r_2->is_valid()) {
         __ movl(Address(rsp, st_off), r);
-        tag_stack(masm, sig_bt[i], st_off);
       } else {
         // long/double in gpr
         NOT_LP64(ShouldNotReachHere());
@@ -639,17 +611,14 @@
           __ movptr(Address(rsp, st_off), rax);
 #endif /* ASSERT */
           __ movptr(Address(rsp, next_off), r);
-          tag_stack(masm, sig_bt[i], next_off);
         } else {
           __ movptr(Address(rsp, st_off), r);
-          tag_stack(masm, sig_bt[i], st_off);
         }
       }
     } else {
       assert(r_1->is_XMMRegister(), "");
       if (!r_2->is_valid()) {
         __ movflt(Address(rsp, st_off), r_1->as_XMMRegister());
-        tag_stack(masm, sig_bt[i], st_off);
       } else {
         assert(sig_bt[i] == T_DOUBLE || sig_bt[i] == T_LONG, "wrong type");
         move_c2i_double(masm, r_1->as_XMMRegister(), st_off);
@@ -665,20 +634,9 @@
 }
 
 
-// For tagged stacks, double or long value aren't contiguous on the stack
-// so get them contiguous for the xmm load
 static void move_i2c_double(MacroAssembler *masm, XMMRegister r, Register saved_sp, int ld_off) {
-  int next_val_off = ld_off - Interpreter::stackElementSize();
-  if (TaggedStackInterpreter) {
-    // use tag slot temporarily for MSW
-    __ movptr(rsi, Address(saved_sp, ld_off));
-    __ movptr(Address(saved_sp, next_val_off+wordSize), rsi);
-    __ movdbl(r, Address(saved_sp, next_val_off));
-    // restore tag
-    __ movptr(Address(saved_sp, next_val_off+wordSize), frame::TagValue);
-  } else {
-    __ movdbl(r, Address(saved_sp, next_val_off));
-  }
+  int next_val_off = ld_off - Interpreter::stackElementSize;
+  __ movdbl(r, Address(saved_sp, next_val_off));
 }
 
 static void gen_i2c_adapter(MacroAssembler *masm,
@@ -797,9 +755,9 @@
     assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(),
             "scrambled load targets?");
     // Load in argument order going down.
-    int ld_off = (total_args_passed - i)*Interpreter::stackElementSize() + Interpreter::value_offset_in_bytes();
+    int ld_off = (total_args_passed - i) * Interpreter::stackElementSize;
     // Point to interpreter value (vs. tag)
-    int next_off = ld_off - Interpreter::stackElementSize();
+    int next_off = ld_off - Interpreter::stackElementSize;
     //
     //
     //
@@ -2322,7 +2280,7 @@
 // this function returns the adjust size (in number of words) to a c2i adapter
 // activation for use during deoptimization
 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals ) {
-  return (callee_locals - callee_parameters) * Interpreter::stackElementWords();
+  return (callee_locals - callee_parameters) * Interpreter::stackElementWords;
 }
 
 
--- a/src/cpu/x86/vm/sharedRuntime_x86_64.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/sharedRuntime_x86_64.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -452,22 +452,6 @@
   __ bind(L);
 }
 
-// Helper function to put tags in interpreter stack.
-static void  tag_stack(MacroAssembler *masm, const BasicType sig, int st_off) {
-  if (TaggedStackInterpreter) {
-    int tag_offset = st_off + Interpreter::expr_tag_offset_in_bytes(0);
-    if (sig == T_OBJECT || sig == T_ARRAY) {
-      __ movptr(Address(rsp, tag_offset), (int32_t) frame::TagReference);
-    } else if (sig == T_LONG || sig == T_DOUBLE) {
-      int next_tag_offset = st_off + Interpreter::expr_tag_offset_in_bytes(1);
-      __ movptr(Address(rsp, next_tag_offset), (int32_t) frame::TagValue);
-      __ movptr(Address(rsp, tag_offset), (int32_t) frame::TagValue);
-    } else {
-      __ movptr(Address(rsp, tag_offset), (int32_t) frame::TagValue);
-    }
-  }
-}
-
 
 static void gen_c2i_adapter(MacroAssembler *masm,
                             int total_args_passed,
@@ -489,7 +473,7 @@
   // we also account for the return address location since
   // we store it first rather than hold it in rax across all the shuffling
 
-  int extraspace = (total_args_passed * Interpreter::stackElementSize()) + wordSize;
+  int extraspace = (total_args_passed * Interpreter::stackElementSize) + wordSize;
 
   // stack is aligned, keep it that way
   extraspace = round_to(extraspace, 2*wordSize);
@@ -513,9 +497,8 @@
     }
 
     // offset to start parameters
-    int st_off   = (total_args_passed - i) * Interpreter::stackElementSize() +
-                   Interpreter::value_offset_in_bytes();
-    int next_off = st_off - Interpreter::stackElementSize();
+    int st_off   = (total_args_passed - i) * Interpreter::stackElementSize;
+    int next_off = st_off - Interpreter::stackElementSize;
 
     // Say 4 args:
     // i   st_off
@@ -543,7 +526,6 @@
         // sign extend??
         __ movl(rax, Address(rsp, ld_off));
         __ movptr(Address(rsp, st_off), rax);
-        tag_stack(masm, sig_bt[i], st_off);
 
       } else {
 
@@ -560,10 +542,8 @@
           __ mov64(rax, CONST64(0xdeadffffdeadaaaa));
           __ movptr(Address(rsp, st_off), rax);
 #endif /* ASSERT */
-          tag_stack(masm, sig_bt[i], next_off);
         } else {
           __ movq(Address(rsp, st_off), rax);
-          tag_stack(masm, sig_bt[i], st_off);
         }
       }
     } else if (r_1->is_Register()) {
@@ -572,7 +552,6 @@
         // must be only an int (or less ) so move only 32bits to slot
         // why not sign extend??
         __ movl(Address(rsp, st_off), r);
-        tag_stack(masm, sig_bt[i], st_off);
       } else {
         // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
         // T_DOUBLE and T_LONG use two slots in the interpreter
@@ -584,10 +563,8 @@
           __ movptr(Address(rsp, st_off), rax);
 #endif /* ASSERT */
           __ movq(Address(rsp, next_off), r);
-          tag_stack(masm, sig_bt[i], next_off);
         } else {
           __ movptr(Address(rsp, st_off), r);
-          tag_stack(masm, sig_bt[i], st_off);
         }
       }
     } else {
@@ -595,7 +572,6 @@
       if (!r_2->is_valid()) {
         // only a float use just part of the slot
         __ movflt(Address(rsp, st_off), r_1->as_XMMRegister());
-        tag_stack(masm, sig_bt[i], st_off);
       } else {
 #ifdef ASSERT
         // Overwrite the unused slot with known junk
@@ -603,7 +579,6 @@
         __ movptr(Address(rsp, st_off), rax);
 #endif /* ASSERT */
         __ movdbl(Address(rsp, next_off), r_1->as_XMMRegister());
-        tag_stack(masm, sig_bt[i], next_off);
       }
     }
   }
@@ -688,9 +663,9 @@
     assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(),
             "scrambled load targets?");
     // Load in argument order going down.
-    int ld_off = (total_args_passed - i)*Interpreter::stackElementSize() + Interpreter::value_offset_in_bytes();
+    int ld_off = (total_args_passed - i)*Interpreter::stackElementSize;
     // Point to interpreter value (vs. tag)
-    int next_off = ld_off - Interpreter::stackElementSize();
+    int next_off = ld_off - Interpreter::stackElementSize;
     //
     //
     //
@@ -2535,7 +2510,7 @@
 // this function returns the adjust size (in number of words) to a c2i adapter
 // activation for use during deoptimization
 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals ) {
-  return (callee_locals - callee_parameters) * Interpreter::stackElementWords();
+  return (callee_locals - callee_parameters) * Interpreter::stackElementWords;
 }
 
 
--- a/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -139,7 +139,7 @@
     // stub code
     __ enter();
     __ movptr(rcx, parameter_size);              // parameter counter
-    __ shlptr(rcx, Interpreter::logStackElementSize()); // convert parameter count to bytes
+    __ shlptr(rcx, Interpreter::logStackElementSize); // convert parameter count to bytes
     __ addptr(rcx, locals_count_in_bytes);       // reserve space for register saves
     __ subptr(rsp, rcx);
     __ andptr(rsp, -(StackAlignmentInBytes));    // Align stack
@@ -194,12 +194,6 @@
     __ xorptr(rbx, rbx);
 
     __ BIND(loop);
-    if (TaggedStackInterpreter) {
-      __ movptr(rax, Address(rdx, rcx, Interpreter::stackElementScale(),
-                      -2*wordSize));                          // get tag
-      __ movptr(Address(rsp, rbx, Interpreter::stackElementScale(),
-                      Interpreter::expr_tag_offset_in_bytes(0)), rax);     // store tag
-    }
 
     // get parameter
     __ movptr(rax, Address(rdx, rcx, Interpreter::stackElementScale(), -wordSize));
--- a/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -278,11 +278,6 @@
     __ movptr(c_rarg2, parameters);       // parameter pointer
     __ movl(c_rarg1, c_rarg3);            // parameter counter is in c_rarg1
     __ BIND(loop);
-    if (TaggedStackInterpreter) {
-      __ movl(rax, Address(c_rarg2, 0)); // get tag
-      __ addptr(c_rarg2, wordSize);      // advance to next tag
-      __ push(rax);                      // pass tag
-    }
     __ movptr(rax, Address(c_rarg2, 0));// get parameter
     __ addptr(c_rarg2, wordSize);       // advance to next parameter
     __ decrementl(c_rarg1);             // decrement counter
--- a/src/cpu/x86/vm/templateInterpreter_x86.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/templateInterpreter_x86.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -28,8 +28,8 @@
   // Size of interpreter code.  Increase if too small.  Interpreter will
   // fail with a guarantee ("not enough space for interpreter generation");
   // if too small.
-  // Run with +PrintInterpreterSize to get the VM to print out the size.
-  // Max size with JVMTI and TaggedStackInterpreter
+  // Run with +PrintInterpreter to get the VM to print out the size.
+  // Max size with JVMTI
 #ifdef AMD64
   const static int InterpreterCodeSize = 200 * 1024;
 #else
--- a/src/cpu/x86/vm/templateInterpreter_x86_32.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/templateInterpreter_x86_32.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -305,7 +305,6 @@
     case T_FLOAT  :
       { const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();
         __ pop(t);                            // remove return address first
-        __ pop_dtos_to_rsp();
         // Must return a result for interpreter or compiler. In SSE
         // mode, results are returned in xmm0 and the FPU stack must
         // be empty.
@@ -468,7 +467,7 @@
   // see if the frame is greater than one page in size. If so,
   // then we need to verify there is enough stack space remaining
   // for the additional locals.
-  __ cmpl(rdx, (page_size - overhead_size)/Interpreter::stackElementSize());
+  __ cmpl(rdx, (page_size - overhead_size)/Interpreter::stackElementSize);
   __ jcc(Assembler::belowEqual, after_frame_check);
 
   // compute rsp as if this were going to be the last frame on
@@ -882,7 +881,7 @@
   __ get_method(method);
   __ verify_oop(method);
   __ load_unsigned_short(t, Address(method, methodOopDesc::size_of_parameters_offset()));
-  __ shlptr(t, Interpreter::logStackElementSize());
+  __ shlptr(t, Interpreter::logStackElementSize);
   __ addptr(t, 2*wordSize);     // allocate two more slots for JNIEnv and possible mirror
   __ subptr(rsp, t);
   __ andptr(rsp, -(StackAlignmentInBytes)); // gcc needs 16 byte aligned stacks to do XMM intrinsics
@@ -1225,9 +1224,6 @@
     __ testl(rdx, rdx);
     __ jcc(Assembler::lessEqual, exit);               // do nothing if rdx <= 0
     __ bind(loop);
-    if (TaggedStackInterpreter) {
-      __ push((int32_t)NULL_WORD);                    // push tag
-    }
     __ push((int32_t)NULL_WORD);                      // initialize local variables
     __ decrement(rdx);                                // until everything initialized
     __ jcc(Assembler::greater, loop);
@@ -1463,7 +1459,7 @@
 
   const int extra_stack = methodOopDesc::extra_stack_entries();
   const int method_stack = (method->max_locals() + method->max_stack() + extra_stack) *
-                           Interpreter::stackElementWords();
+                           Interpreter::stackElementWords;
   return overhead_size + method_stack + stub_code;
 }
 
@@ -1487,9 +1483,9 @@
   // NOTE: return size is in words not bytes
 
   // fixed size of an interpreter frame:
-  int max_locals = method->max_locals() * Interpreter::stackElementWords();
+  int max_locals = method->max_locals() * Interpreter::stackElementWords;
   int extra_locals = (method->max_locals() - method->size_of_parameters()) *
-                     Interpreter::stackElementWords();
+                     Interpreter::stackElementWords;
 
   int overhead = frame::sender_sp_offset - frame::interpreter_frame_initial_sp_offset;
 
@@ -1499,9 +1495,9 @@
 
 
   int size = overhead +
-         ((callee_locals - callee_param_count)*Interpreter::stackElementWords()) +
+         ((callee_locals - callee_param_count)*Interpreter::stackElementWords) +
          (moncount*frame::interpreter_frame_monitor_size()) +
-         tempcount*Interpreter::stackElementWords() + popframe_extra_args;
+         tempcount*Interpreter::stackElementWords + popframe_extra_args;
 
   if (interpreter_frame != NULL) {
 #ifdef ASSERT
@@ -1525,7 +1521,7 @@
 
     // Set last_sp
     intptr_t*  rsp = (intptr_t*) monbot  -
-                     tempcount*Interpreter::stackElementWords() -
+                     tempcount*Interpreter::stackElementWords -
                      popframe_extra_args;
     interpreter_frame->interpreter_frame_set_last_sp(rsp);
 
@@ -1625,7 +1621,7 @@
     __ get_method(rax);
     __ verify_oop(rax);
     __ load_unsigned_short(rax, Address(rax, in_bytes(methodOopDesc::size_of_parameters_offset())));
-    __ shlptr(rax, Interpreter::logStackElementSize());
+    __ shlptr(rax, Interpreter::logStackElementSize);
     __ restore_locals();
     __ subptr(rdi, rax);
     __ addptr(rdi, wordSize);
--- a/src/cpu/x86/vm/templateInterpreter_x86_64.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/templateInterpreter_x86_64.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -199,7 +199,6 @@
                        in_bytes(constantPoolCacheOopDesc::base_offset()) +
                        3 * wordSize));
   __ andl(rbx, 0xFF);
-  if (TaggedStackInterpreter) __ shll(rbx, 1); // 2 slots per parameter.
   __ lea(rsp, Address(rsp, rbx, Address::times_8));
   __ dispatch_next(state, step);
 
@@ -417,7 +416,7 @@
   // see if the frame is greater than one page in size. If so,
   // then we need to verify there is enough stack space remaining
   // for the additional locals.
-  __ cmpl(rdx, (page_size - overhead_size) / Interpreter::stackElementSize());
+  __ cmpl(rdx, (page_size - overhead_size) / Interpreter::stackElementSize);
   __ jcc(Assembler::belowEqual, after_frame_check);
 
   // compute rsp as if this were going to be the last frame on
@@ -428,7 +427,7 @@
 
   // locals + overhead, in bytes
   __ mov(rax, rdx);
-  __ shlptr(rax, Interpreter::logStackElementSize()); // 2 slots per parameter.
+  __ shlptr(rax, Interpreter::logStackElementSize);  // 2 slots per parameter.
   __ addptr(rax, overhead_size);
 
 #ifdef ASSERT
@@ -759,7 +758,6 @@
   // for natives the size of locals is zero
 
   // compute beginning of parameters (r14)
-  if (TaggedStackInterpreter) __ shll(rcx, 1); // 2 slots per parameter.
   __ lea(r14, Address(rsp, rcx, Address::times_8, -wordSize));
 
   // add 2 zero-initialized slots for native calls
@@ -865,7 +863,7 @@
   __ load_unsigned_short(t,
                          Address(method,
                                  methodOopDesc::size_of_parameters_offset()));
-  __ shll(t, Interpreter::logStackElementSize());
+  __ shll(t, Interpreter::logStackElementSize);
 
   __ subptr(rsp, t);
   __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
@@ -1228,7 +1226,6 @@
   __ pop(rax);
 
   // compute beginning of parameters (r14)
-  if (TaggedStackInterpreter) __ shll(rcx, 1); // 2 slots per parameter.
   __ lea(r14, Address(rsp, rcx, Address::times_8, -wordSize));
 
   // rdx - # of additional locals
@@ -1239,7 +1236,6 @@
     __ testl(rdx, rdx);
     __ jcc(Assembler::lessEqual, exit); // do nothing if rdx <= 0
     __ bind(loop);
-    if (TaggedStackInterpreter) __ push((int) NULL_WORD);  // push tag
     __ push((int) NULL_WORD); // initialize local variables
     __ decrementl(rdx); // until everything initialized
     __ jcc(Assembler::greater, loop);
@@ -1486,7 +1482,7 @@
   const int stub_code = frame::entry_frame_after_call_words;
   const int extra_stack = methodOopDesc::extra_stack_entries();
   const int method_stack = (method->max_locals() + method->max_stack() + extra_stack) *
-                           Interpreter::stackElementWords();
+                           Interpreter::stackElementWords;
   return (overhead_size + method_stack + stub_code);
 }
 
@@ -1507,9 +1503,9 @@
   // It is also guaranteed to be walkable even though it is in a skeletal state
 
   // fixed size of an interpreter frame:
-  int max_locals = method->max_locals() * Interpreter::stackElementWords();
+  int max_locals = method->max_locals() * Interpreter::stackElementWords;
   int extra_locals = (method->max_locals() - method->size_of_parameters()) *
-                     Interpreter::stackElementWords();
+                     Interpreter::stackElementWords;
 
   int overhead = frame::sender_sp_offset -
                  frame::interpreter_frame_initial_sp_offset;
@@ -1518,9 +1514,9 @@
   // for the callee's params we only need to account for the extra
   // locals.
   int size = overhead +
-         (callee_locals - callee_param_count)*Interpreter::stackElementWords() +
+         (callee_locals - callee_param_count)*Interpreter::stackElementWords +
          moncount * frame::interpreter_frame_monitor_size() +
-         tempcount* Interpreter::stackElementWords() + popframe_extra_args;
+         tempcount* Interpreter::stackElementWords + popframe_extra_args;
   if (interpreter_frame != NULL) {
 #ifdef ASSERT
     if (!EnableMethodHandles)
@@ -1544,7 +1540,7 @@
 
     // Set last_sp
     intptr_t*  esp = (intptr_t*) monbot -
-                     tempcount*Interpreter::stackElementWords() -
+                     tempcount*Interpreter::stackElementWords -
                      popframe_extra_args;
     interpreter_frame->interpreter_frame_set_last_sp(esp);
 
@@ -1650,7 +1646,7 @@
     __ get_method(rax);
     __ load_unsigned_short(rax, Address(rax, in_bytes(methodOopDesc::
                                                 size_of_parameters_offset())));
-    __ shll(rax, Interpreter::logStackElementSize());
+    __ shll(rax, Interpreter::logStackElementSize);
     __ restore_locals(); // XXX do we need this?
     __ subptr(r14, rax);
     __ addptr(r14, wordSize);
--- a/src/cpu/x86/vm/templateTable_x86_32.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/templateTable_x86_32.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -50,7 +50,7 @@
 static inline Address aaddress(int n)            { return iaddress(n); }
 
 static inline Address iaddress(Register r)       {
-  return Address(rdi, r, Interpreter::stackElementScale(), Interpreter::value_offset_in_bytes());
+  return Address(rdi, r, Interpreter::stackElementScale());
 }
 static inline Address laddress(Register r)       {
   return Address(rdi, r, Interpreter::stackElementScale(), Interpreter::local_offset_in_bytes(1));
@@ -59,12 +59,9 @@
   return Address(rdi, r, Interpreter::stackElementScale(), Interpreter::local_offset_in_bytes(0));
 }
 
-static inline Address faddress(Register r)       { return iaddress(r); };
-static inline Address daddress(Register r)       {
-  assert(!TaggedStackInterpreter, "This doesn't work");
-  return laddress(r);
-};
-static inline Address aaddress(Register r)       { return iaddress(r); };
+static inline Address faddress(Register r)       { return iaddress(r); }
+static inline Address daddress(Register r)       { return laddress(r); }
+static inline Address aaddress(Register r)       { return iaddress(r); }
 
 // expression stack
 // (Note: Must not use symmetric equivalents at_rsp_m1/2 since they store
@@ -448,7 +445,6 @@
   // Get the local value into tos
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 
@@ -456,18 +452,15 @@
   transition(vtos, itos);
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
   __ push(itos);
   locals_index(rbx, 3);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 void TemplateTable::fast_iload() {
   transition(vtos, itos);
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 
@@ -476,7 +469,6 @@
   locals_index(rbx);
   __ movptr(rax, laddress(rbx));
   NOT_LP64(__ movl(rdx, haddress(rbx)));
-  debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
 }
 
 
@@ -484,26 +476,13 @@
   transition(vtos, ftos);
   locals_index(rbx);
   __ fld_s(faddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 
 void TemplateTable::dload() {
   transition(vtos, dtos);
   locals_index(rbx);
-  if (TaggedStackInterpreter) {
-    // Get double out of locals array, onto temp stack and load with
-    // float instruction into ST0
-    __ movl(rax, laddress(rbx));
-    __ movl(rdx, haddress(rbx));
-    __ push(rdx);  // push hi first
-    __ push(rax);
-    __ fld_d(Address(rsp, 0));
-    __ addptr(rsp, 2*wordSize);
-    debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
-  } else {
-    __ fld_d(daddress(rbx));
-  }
+  __ fld_d(daddress(rbx));
 }
 
 
@@ -511,7 +490,6 @@
   transition(vtos, atos);
   locals_index(rbx);
   __ movptr(rax, aaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagReference, rbx));
 }
 
 
@@ -527,7 +505,6 @@
   transition(vtos, itos);
   locals_index_wide(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 
@@ -536,7 +513,6 @@
   locals_index_wide(rbx);
   __ movptr(rax, laddress(rbx));
   NOT_LP64(__ movl(rdx, haddress(rbx)));
-  debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
 }
 
 
@@ -544,26 +520,13 @@
   transition(vtos, ftos);
   locals_index_wide(rbx);
   __ fld_s(faddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 
 void TemplateTable::wide_dload() {
   transition(vtos, dtos);
   locals_index_wide(rbx);
-  if (TaggedStackInterpreter) {
-    // Get double out of locals array, onto temp stack and load with
-    // float instruction into ST0
-    __ movl(rax, laddress(rbx));
-    __ movl(rdx, haddress(rbx));
-    __ push(rdx);  // push hi first
-    __ push(rax);
-    __ fld_d(Address(rsp, 0));
-    __ addl(rsp, 2*wordSize);
-    debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
-  } else {
-    __ fld_d(daddress(rbx));
-  }
+  __ fld_d(daddress(rbx));
 }
 
 
@@ -571,7 +534,6 @@
   transition(vtos, atos);
   locals_index_wide(rbx);
   __ movptr(rax, aaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagReference, rbx));
 }
 
 void TemplateTable::index_check(Register array, Register index) {
@@ -672,7 +634,6 @@
   // load index out of locals
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 
   // rdx: array
   index_check(rdx, rax);
@@ -695,7 +656,6 @@
 void TemplateTable::iload(int n) {
   transition(vtos, itos);
   __ movl(rax, iaddress(n));
-  debug_only(__ verify_local_tag(frame::TagValue, n));
 }
 
 
@@ -703,39 +663,24 @@
   transition(vtos, ltos);
   __ movptr(rax, laddress(n));
   NOT_LP64(__ movptr(rdx, haddress(n)));
-  debug_only(__ verify_local_tag(frame::TagCategory2, n));
 }
 
 
 void TemplateTable::fload(int n) {
   transition(vtos, ftos);
   __ fld_s(faddress(n));
-  debug_only(__ verify_local_tag(frame::TagValue, n));
 }
 
 
 void TemplateTable::dload(int n) {
   transition(vtos, dtos);
-  if (TaggedStackInterpreter) {
-    // Get double out of locals array, onto temp stack and load with
-    // float instruction into ST0
-    __ movl(rax, laddress(n));
-    __ movl(rdx, haddress(n));
-    __ push(rdx);  // push hi first
-    __ push(rax);
-    __ fld_d(Address(rsp, 0));
-    __ addptr(rsp, 2*wordSize);  // reset rsp
-    debug_only(__ verify_local_tag(frame::TagCategory2, n));
-  } else {
-    __ fld_d(daddress(n));
-  }
+  __ fld_d(daddress(n));
 }
 
 
 void TemplateTable::aload(int n) {
   transition(vtos, atos);
   __ movptr(rax, aaddress(n));
-  debug_only(__ verify_local_tag(frame::TagReference, n));
 }
 
 
@@ -809,7 +754,6 @@
   transition(itos, vtos);
   locals_index(rbx);
   __ movl(iaddress(rbx), rax);
-  __ tag_local(frame::TagValue, rbx);
 }
 
 
@@ -818,7 +762,6 @@
   locals_index(rbx);
   __ movptr(laddress(rbx), rax);
   NOT_LP64(__ movptr(haddress(rbx), rdx));
-  __ tag_local(frame::TagCategory2, rbx);
 }
 
 
@@ -826,34 +769,21 @@
   transition(ftos, vtos);
   locals_index(rbx);
   __ fstp_s(faddress(rbx));
-  __ tag_local(frame::TagValue, rbx);
 }
 
 
 void TemplateTable::dstore() {
   transition(dtos, vtos);
   locals_index(rbx);
-  if (TaggedStackInterpreter) {
-    // Store double on stack and reload into locals nonadjacently
-    __ subptr(rsp, 2 * wordSize);
-    __ fstp_d(Address(rsp, 0));
-    __ pop(rax);
-    __ pop(rdx);
-    __ movptr(laddress(rbx), rax);
-    __ movptr(haddress(rbx), rdx);
-    __ tag_local(frame::TagCategory2, rbx);
-  } else {
-    __ fstp_d(daddress(rbx));
-  }
+  __ fstp_d(daddress(rbx));
 }
 
 
 void TemplateTable::astore() {
   transition(vtos, vtos);
-  __ pop_ptr(rax, rdx);   // will need to pop tag too
+  __ pop_ptr(rax);
   locals_index(rbx);
   __ movptr(aaddress(rbx), rax);
-  __ tag_local(rdx, rbx);    // need to store same tag in local may be returnAddr
 }
 
 
@@ -862,7 +792,6 @@
   __ pop_i(rax);
   locals_index_wide(rbx);
   __ movl(iaddress(rbx), rax);
-  __ tag_local(frame::TagValue, rbx);
 }
 
 
@@ -872,7 +801,6 @@
   locals_index_wide(rbx);
   __ movptr(laddress(rbx), rax);
   NOT_LP64(__ movl(haddress(rbx), rdx));
-  __ tag_local(frame::TagCategory2, rbx);
 }
 
 
@@ -888,10 +816,9 @@
 
 void TemplateTable::wide_astore() {
   transition(vtos, vtos);
-  __ pop_ptr(rax, rdx);
+  __ pop_ptr(rax);
   locals_index_wide(rbx);
   __ movptr(aaddress(rbx), rax);
-  __ tag_local(rdx, rbx);
 }
 
 
@@ -990,7 +917,7 @@
 
   // Pop stack arguments
   __ bind(done);
-  __ addptr(rsp, 3 * Interpreter::stackElementSize());
+  __ addptr(rsp, 3 * Interpreter::stackElementSize);
 }
 
 
@@ -1024,7 +951,6 @@
 void TemplateTable::istore(int n) {
   transition(itos, vtos);
   __ movl(iaddress(n), rax);
-  __ tag_local(frame::TagValue, n);
 }
 
 
@@ -1032,58 +958,45 @@
   transition(ltos, vtos);
   __ movptr(laddress(n), rax);
   NOT_LP64(__ movptr(haddress(n), rdx));
-  __ tag_local(frame::TagCategory2, n);
 }
 
 
 void TemplateTable::fstore(int n) {
   transition(ftos, vtos);
   __ fstp_s(faddress(n));
-  __ tag_local(frame::TagValue, n);
 }
 
 
 void TemplateTable::dstore(int n) {
   transition(dtos, vtos);
-  if (TaggedStackInterpreter) {
-    __ subptr(rsp, 2 * wordSize);
-    __ fstp_d(Address(rsp, 0));
-    __ pop(rax);
-    __ pop(rdx);
-    __ movl(laddress(n), rax);
-    __ movl(haddress(n), rdx);
-    __ tag_local(frame::TagCategory2, n);
-  } else {
-    __ fstp_d(daddress(n));
-  }
+  __ fstp_d(daddress(n));
 }
 
 
 void TemplateTable::astore(int n) {
   transition(vtos, vtos);
-  __ pop_ptr(rax, rdx);
+  __ pop_ptr(rax);
   __ movptr(aaddress(n), rax);
-  __ tag_local(rdx, n);
 }
 
 
 void TemplateTable::pop() {
   transition(vtos, vtos);
-  __ addptr(rsp, Interpreter::stackElementSize());
+  __ addptr(rsp, Interpreter::stackElementSize);
 }
 
 
 void TemplateTable::pop2() {
   transition(vtos, vtos);
-  __ addptr(rsp, 2*Interpreter::stackElementSize());
+  __ addptr(rsp, 2*Interpreter::stackElementSize);
 }
 
 
 void TemplateTable::dup() {
   transition(vtos, vtos);
   // stack: ..., a
-  __ load_ptr_and_tag(0, rax, rdx);
-  __ push_ptr(rax, rdx);
+  __ load_ptr(0, rax);
+  __ push_ptr(rax);
   // stack: ..., a, a
 }
 
@@ -1091,11 +1004,11 @@
 void TemplateTable::dup_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b
-  __ load_ptr_and_tag(0, rax, rdx);  // load b
-  __ load_ptr_and_tag(1, rcx, rbx);  // load a
-  __ store_ptr_and_tag(1, rax, rdx); // store b
-  __ store_ptr_and_tag(0, rcx, rbx); // store a
-  __ push_ptr(rax, rdx);             // push b
+  __ load_ptr( 0, rax);  // load b
+  __ load_ptr( 1, rcx);  // load a
+  __ store_ptr(1, rax);  // store b
+  __ store_ptr(0, rcx);  // store a
+  __ push_ptr(rax);      // push b
   // stack: ..., b, a, b
 }
 
@@ -1103,15 +1016,15 @@
 void TemplateTable::dup_x2() {
   transition(vtos, vtos);
   // stack: ..., a, b, c
-  __ load_ptr_and_tag(0, rax, rdx);  // load c
-  __ load_ptr_and_tag(2, rcx, rbx);  // load a
-  __ store_ptr_and_tag(2, rax, rdx); // store c in a
-  __ push_ptr(rax, rdx);             // push c
+  __ load_ptr( 0, rax);  // load c
+  __ load_ptr( 2, rcx);  // load a
+  __ store_ptr(2, rax);  // store c in a
+  __ push_ptr(rax);      // push c
   // stack: ..., c, b, c, c
-  __ load_ptr_and_tag(2, rax, rdx);  // load b
-  __ store_ptr_and_tag(2, rcx, rbx); // store a in b
+  __ load_ptr( 2, rax);  // load b
+  __ store_ptr(2, rcx);  // store a in b
   // stack: ..., c, a, c, c
-  __ store_ptr_and_tag(1, rax, rdx); // store b in c
+  __ store_ptr(1, rax);  // store b in c
   // stack: ..., c, a, b, c
 }
 
@@ -1119,10 +1032,10 @@
 void TemplateTable::dup2() {
   transition(vtos, vtos);
   // stack: ..., a, b
-  __ load_ptr_and_tag(1, rax, rdx);  // load a
-  __ push_ptr(rax, rdx);             // push a
-  __ load_ptr_and_tag(1, rax, rdx);  // load b
-  __ push_ptr(rax, rdx);             // push b
+  __ load_ptr(1, rax);  // load a
+  __ push_ptr(rax);     // push a
+  __ load_ptr(1, rax);  // load b
+  __ push_ptr(rax);     // push b
   // stack: ..., a, b, a, b
 }
 
@@ -1130,17 +1043,17 @@
 void TemplateTable::dup2_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b, c
-  __ load_ptr_and_tag(0, rcx, rbx);  // load c
-  __ load_ptr_and_tag(1, rax, rdx);  // load b
-  __ push_ptr(rax, rdx);             // push b
-  __ push_ptr(rcx, rbx);             // push c
+  __ load_ptr( 0, rcx);  // load c
+  __ load_ptr( 1, rax);  // load b
+  __ push_ptr(rax);      // push b
+  __ push_ptr(rcx);      // push c
   // stack: ..., a, b, c, b, c
-  __ store_ptr_and_tag(3, rcx, rbx); // store c in b
+  __ store_ptr(3, rcx);  // store c in b
   // stack: ..., a, c, c, b, c
-  __ load_ptr_and_tag(4, rcx, rbx);  // load a
-  __ store_ptr_and_tag(2, rcx, rbx); // store a in 2nd c
+  __ load_ptr( 4, rcx);  // load a
+  __ store_ptr(2, rcx);  // store a in 2nd c
   // stack: ..., a, c, a, b, c
-  __ store_ptr_and_tag(4, rax, rdx); // store b in a
+  __ store_ptr(4, rax);  // store b in a
   // stack: ..., b, c, a, b, c
   // stack: ..., b, c, a, b, c
 }
@@ -1149,19 +1062,19 @@
 void TemplateTable::dup2_x2() {
   transition(vtos, vtos);
   // stack: ..., a, b, c, d
-  __ load_ptr_and_tag(0, rcx, rbx);  // load d
-  __ load_ptr_and_tag(1, rax, rdx);  // load c
-  __ push_ptr(rax, rdx);             // push c
-  __ push_ptr(rcx, rbx);             // push d
+  __ load_ptr( 0, rcx);  // load d
+  __ load_ptr( 1, rax);  // load c
+  __ push_ptr(rax);      // push c
+  __ push_ptr(rcx);      // push d
   // stack: ..., a, b, c, d, c, d
-  __ load_ptr_and_tag(4, rax, rdx);  // load b
-  __ store_ptr_and_tag(2, rax, rdx); // store b in d
-  __ store_ptr_and_tag(4, rcx, rbx); // store d in b
+  __ load_ptr( 4, rax);  // load b
+  __ store_ptr(2, rax);  // store b in d
+  __ store_ptr(4, rcx);  // store d in b
   // stack: ..., a, d, c, b, c, d
-  __ load_ptr_and_tag(5, rcx, rbx);  // load a
-  __ load_ptr_and_tag(3, rax, rdx);  // load c
-  __ store_ptr_and_tag(3, rcx, rbx); // store a in c
-  __ store_ptr_and_tag(5, rax, rdx); // store c in a
+  __ load_ptr( 5, rcx);  // load a
+  __ load_ptr( 3, rax);  // load c
+  __ store_ptr(3, rcx);  // store a in c
+  __ store_ptr(5, rax);  // store c in a
   // stack: ..., c, d, a, b, c, d
   // stack: ..., c, d, a, b, c, d
 }
@@ -1170,10 +1083,10 @@
 void TemplateTable::swap() {
   transition(vtos, vtos);
   // stack: ..., a, b
-  __ load_ptr_and_tag(1, rcx, rbx);  // load a
-  __ load_ptr_and_tag(0, rax, rdx);  // load b
-  __ store_ptr_and_tag(0, rcx, rbx); // store a in b
-  __ store_ptr_and_tag(1, rax, rdx); // store b in a
+  __ load_ptr( 1, rcx);  // load a
+  __ load_ptr( 0, rax);  // load b
+  __ store_ptr(0, rcx);  // store a in b
+  __ store_ptr(1, rax);  // store b in a
   // stack: ..., b, a
 }
 
@@ -1181,12 +1094,12 @@
 void TemplateTable::iop2(Operation op) {
   transition(itos, itos);
   switch (op) {
-    case add  :                    __ pop_i(rdx); __ addl (rax, rdx); break;
+    case add  :                   __ pop_i(rdx); __ addl (rax, rdx); break;
     case sub  : __ mov(rdx, rax); __ pop_i(rax); __ subl (rax, rdx); break;
-    case mul  :                    __ pop_i(rdx); __ imull(rax, rdx); break;
-    case _and :                    __ pop_i(rdx); __ andl (rax, rdx); break;
-    case _or  :                    __ pop_i(rdx); __ orl  (rax, rdx); break;
-    case _xor :                    __ pop_i(rdx); __ xorl (rax, rdx); break;
+    case mul  :                   __ pop_i(rdx); __ imull(rax, rdx); break;
+    case _and :                   __ pop_i(rdx); __ andl (rax, rdx); break;
+    case _or  :                   __ pop_i(rdx); __ orl  (rax, rdx); break;
+    case _xor :                   __ pop_i(rdx); __ xorl (rax, rdx); break;
     case shl  : __ mov(rcx, rax); __ pop_i(rax); __ shll (rax);      break; // implicit masking of lower 5 bits by Intel shift instr.
     case shr  : __ mov(rcx, rax); __ pop_i(rax); __ sarl (rax);      break; // implicit masking of lower 5 bits by Intel shift instr.
     case ushr : __ mov(rcx, rax); __ pop_i(rax); __ shrl (rax);      break; // implicit masking of lower 5 bits by Intel shift instr.
@@ -1199,13 +1112,13 @@
   transition(ltos, ltos);
   __ pop_l(rbx, rcx);
   switch (op) {
-    case add : __ addl(rax, rbx); __ adcl(rdx, rcx); break;
-    case sub : __ subl(rbx, rax); __ sbbl(rcx, rdx);
-               __ mov(rax, rbx); __ mov(rdx, rcx); break;
-    case _and: __ andl(rax, rbx); __ andl(rdx, rcx); break;
-    case _or : __ orl (rax, rbx); __ orl (rdx, rcx); break;
-    case _xor: __ xorl(rax, rbx); __ xorl(rdx, rcx); break;
-    default : ShouldNotReachHere();
+    case add  : __ addl(rax, rbx); __ adcl(rdx, rcx); break;
+    case sub  : __ subl(rbx, rax); __ sbbl(rcx, rdx);
+                __ mov (rax, rbx); __ mov (rdx, rcx); break;
+    case _and : __ andl(rax, rbx); __ andl(rdx, rcx); break;
+    case _or  : __ orl (rax, rbx); __ orl (rdx, rcx); break;
+    case _xor : __ xorl(rax, rbx); __ xorl(rdx, rcx); break;
+    default   : ShouldNotReachHere();
   }
 }
 
@@ -1299,7 +1212,6 @@
 
 void TemplateTable::fop2(Operation op) {
   transition(ftos, ftos);
-  __ pop_ftos_to_rsp();  // pop ftos into rsp
   switch (op) {
     case add: __ fadd_s (at_rsp());                break;
     case sub: __ fsubr_s(at_rsp());                break;
@@ -1315,7 +1227,6 @@
 
 void TemplateTable::dop2(Operation op) {
   transition(dtos, dtos);
-  __ pop_dtos_to_rsp();  // pop dtos into rsp
 
   switch (op) {
     case add: __ fadd_d (at_rsp());                break;
@@ -1557,10 +1468,8 @@
 
 void TemplateTable::float_cmp(bool is_float, int unordered_result) {
   if (is_float) {
-    __ pop_ftos_to_rsp();
     __ fld_s(at_rsp());
   } else {
-    __ pop_dtos_to_rsp();
     __ fld_d(at_rsp());
     __ pop(rdx);
   }
@@ -2854,7 +2763,6 @@
   transition(vtos, state);
   // get receiver
   __ movptr(rax, aaddress(0));
-  debug_only(__ verify_local_tag(frame::TagReference, 0));
   // access constant pool cache
   __ get_cache_and_index_at_bcp(rcx, rdx, 2);
   __ movptr(rbx, Address(rcx,
--- a/src/cpu/x86/vm/templateTable_x86_64.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/x86/vm/templateTable_x86_64.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -58,7 +58,7 @@
 }
 
 static inline Address iaddress(Register r) {
-  return Address(r14, r, Address::times_8, Interpreter::value_offset_in_bytes());
+  return Address(r14, r, Address::times_8);
 }
 
 static inline Address laddress(Register r) {
@@ -418,7 +418,6 @@
 void TemplateTable::locals_index(Register reg, int offset) {
   __ load_unsigned_byte(reg, at_bcp(offset));
   __ negptr(reg);
-  if (TaggedStackInterpreter) __ shlptr(reg, 1);  // index = index*2
 }
 
 void TemplateTable::iload() {
@@ -460,53 +459,45 @@
   // Get the local value into tos
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 void TemplateTable::fast_iload2() {
   transition(vtos, itos);
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
   __ push(itos);
   locals_index(rbx, 3);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 void TemplateTable::fast_iload() {
   transition(vtos, itos);
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 void TemplateTable::lload() {
   transition(vtos, ltos);
   locals_index(rbx);
   __ movq(rax, laddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
 }
 
 void TemplateTable::fload() {
   transition(vtos, ftos);
   locals_index(rbx);
   __ movflt(xmm0, faddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 void TemplateTable::dload() {
   transition(vtos, dtos);
   locals_index(rbx);
   __ movdbl(xmm0, daddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
 }
 
 void TemplateTable::aload() {
   transition(vtos, atos);
   locals_index(rbx);
   __ movptr(rax, aaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagReference, rbx));
 }
 
 void TemplateTable::locals_index_wide(Register reg) {
@@ -514,42 +505,36 @@
   __ bswapl(reg);
   __ shrl(reg, 16);
   __ negptr(reg);
-  if (TaggedStackInterpreter) __ shlptr(reg, 1);  // index = index*2
 }
 
 void TemplateTable::wide_iload() {
   transition(vtos, itos);
   locals_index_wide(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 void TemplateTable::wide_lload() {
   transition(vtos, ltos);
   locals_index_wide(rbx);
   __ movq(rax, laddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
 }
 
 void TemplateTable::wide_fload() {
   transition(vtos, ftos);
   locals_index_wide(rbx);
   __ movflt(xmm0, faddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 
 void TemplateTable::wide_dload() {
   transition(vtos, dtos);
   locals_index_wide(rbx);
   __ movdbl(xmm0, daddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
 }
 
 void TemplateTable::wide_aload() {
   transition(vtos, atos);
   locals_index_wide(rbx);
   __ movptr(rax, aaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagReference, rbx));
 }
 
 void TemplateTable::index_check(Register array, Register index) {
@@ -654,7 +639,6 @@
   // load index out of locals
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
-  debug_only(__ verify_local_tag(frame::TagValue, rbx));
 
   // eax: index
   // rdx: array
@@ -681,31 +665,26 @@
 void TemplateTable::iload(int n) {
   transition(vtos, itos);
   __ movl(rax, iaddress(n));
-  debug_only(__ verify_local_tag(frame::TagValue, n));
 }
 
 void TemplateTable::lload(int n) {
   transition(vtos, ltos);
   __ movq(rax, laddress(n));
-  debug_only(__ verify_local_tag(frame::TagCategory2, n));
 }
 
 void TemplateTable::fload(int n) {
   transition(vtos, ftos);
   __ movflt(xmm0, faddress(n));
-  debug_only(__ verify_local_tag(frame::TagValue, n));
 }
 
 void TemplateTable::dload(int n) {
   transition(vtos, dtos);
   __ movdbl(xmm0, daddress(n));
-  debug_only(__ verify_local_tag(frame::TagCategory2, n));
 }
 
 void TemplateTable::aload(int n) {
   transition(vtos, atos);
   __ movptr(rax, aaddress(n));
-  debug_only(__ verify_local_tag(frame::TagReference, n));
 }
 
 void TemplateTable::aload_0() {
@@ -791,36 +770,31 @@
   transition(itos, vtos);
   locals_index(rbx);
   __ movl(iaddress(rbx), rax);
-  __ tag_local(frame::TagValue, rbx);
 }
 
 void TemplateTable::lstore() {
   transition(ltos, vtos);
   locals_index(rbx);
   __ movq(laddress(rbx), rax);
-  __ tag_local(frame::TagCategory2, rbx);
 }
 
 void TemplateTable::fstore() {
   transition(ftos, vtos);
   locals_index(rbx);
   __ movflt(faddress(rbx), xmm0);
-  __ tag_local(frame::TagValue, rbx);
 }
 
 void TemplateTable::dstore() {
   transition(dtos, vtos);
   locals_index(rbx);
   __ movdbl(daddress(rbx), xmm0);
-  __ tag_local(frame::TagCategory2, rbx);
 }
 
 void TemplateTable::astore() {
   transition(vtos, vtos);
-  __ pop_ptr(rax, rdx);    // will need to pop tag too
+  __ pop_ptr(rax);
   locals_index(rbx);
   __ movptr(aaddress(rbx), rax);
-  __ tag_local(rdx, rbx);  // store tag from stack, might be returnAddr
 }
 
 void TemplateTable::wide_istore() {
@@ -828,7 +802,6 @@
   __ pop_i();
   locals_index_wide(rbx);
   __ movl(iaddress(rbx), rax);
-  __ tag_local(frame::TagValue, rbx);
 }
 
 void TemplateTable::wide_lstore() {
@@ -836,7 +809,6 @@
   __ pop_l();
   locals_index_wide(rbx);
   __ movq(laddress(rbx), rax);
-  __ tag_local(frame::TagCategory2, rbx);
 }
 
 void TemplateTable::wide_fstore() {
@@ -844,7 +816,6 @@
   __ pop_f();
   locals_index_wide(rbx);
   __ movflt(faddress(rbx), xmm0);
-  __ tag_local(frame::TagValue, rbx);
 }
 
 void TemplateTable::wide_dstore() {
@@ -852,15 +823,13 @@
   __ pop_d();
   locals_index_wide(rbx);
   __ movdbl(daddress(rbx), xmm0);
-  __ tag_local(frame::TagCategory2, rbx);
 }
 
 void TemplateTable::wide_astore() {
   transition(vtos, vtos);
-  __ pop_ptr(rax, rdx);    // will need to pop tag too
+  __ pop_ptr(rax);
   locals_index_wide(rbx);
   __ movptr(aaddress(rbx), rax);
-  __ tag_local(rdx, rbx);  // store tag from stack, might be returnAddr
 }
 
 void TemplateTable::iastore() {
@@ -972,7 +941,7 @@
 
   // Pop stack arguments
   __ bind(done);
-  __ addptr(rsp, 3 * Interpreter::stackElementSize());
+  __ addptr(rsp, 3 * Interpreter::stackElementSize);
 }
 
 void TemplateTable::bastore() {
@@ -1010,130 +979,125 @@
 void TemplateTable::istore(int n) {
   transition(itos, vtos);
   __ movl(iaddress(n), rax);
-  __ tag_local(frame::TagValue, n);
 }
 
 void TemplateTable::lstore(int n) {
   transition(ltos, vtos);
   __ movq(laddress(n), rax);
-  __ tag_local(frame::TagCategory2, n);
 }
 
 void TemplateTable::fstore(int n) {
   transition(ftos, vtos);
   __ movflt(faddress(n), xmm0);
-  __ tag_local(frame::TagValue, n);
 }
 
 void TemplateTable::dstore(int n) {
   transition(dtos, vtos);
   __ movdbl(daddress(n), xmm0);
-  __ tag_local(frame::TagCategory2, n);
 }
 
 void TemplateTable::astore(int n) {
   transition(vtos, vtos);
-  __ pop_ptr(rax, rdx);
+  __ pop_ptr(rax);
   __ movptr(aaddress(n), rax);
-  __ tag_local(rdx, n);
 }
 
 void TemplateTable::pop() {
   transition(vtos, vtos);
-  __ addptr(rsp, Interpreter::stackElementSize());
+  __ addptr(rsp, Interpreter::stackElementSize);
 }
 
 void TemplateTable::pop2() {
   transition(vtos, vtos);
-  __ addptr(rsp, 2 * Interpreter::stackElementSize());
+  __ addptr(rsp, 2 * Interpreter::stackElementSize);
 }
 
 void TemplateTable::dup() {
   transition(vtos, vtos);
-  __ load_ptr_and_tag(0, rax, rdx);
-  __ push_ptr(rax, rdx);
+  __ load_ptr(0, rax);
+  __ push_ptr(rax);
   // stack: ..., a, a
 }
 
 void TemplateTable::dup_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b
-  __ load_ptr_and_tag(0, rax, rdx);  // load b
-  __ load_ptr_and_tag(1, rcx, rbx);  // load a
-  __ store_ptr_and_tag(1, rax, rdx); // store b
-  __ store_ptr_and_tag(0, rcx, rbx); // store a
-  __ push_ptr(rax, rdx);             // push b
+  __ load_ptr( 0, rax);  // load b
+  __ load_ptr( 1, rcx);  // load a
+  __ store_ptr(1, rax);  // store b
+  __ store_ptr(0, rcx);  // store a
+  __ push_ptr(rax);      // push b
   // stack: ..., b, a, b
 }
 
 void TemplateTable::dup_x2() {
   transition(vtos, vtos);
   // stack: ..., a, b, c
-  __ load_ptr_and_tag(0, rax, rdx);  // load c
-  __ load_ptr_and_tag(2, rcx, rbx);  // load a
-  __ store_ptr_and_tag(2, rax, rdx); // store c in a
-  __ push_ptr(rax, rdx);             // push c
+  __ load_ptr( 0, rax);  // load c
+  __ load_ptr( 2, rcx);  // load a
+  __ store_ptr(2, rax);  // store c in a
+  __ push_ptr(rax);      // push c
   // stack: ..., c, b, c, c
-  __ load_ptr_and_tag(2, rax, rdx);  // load b
-  __ store_ptr_and_tag(2, rcx, rbx); // store a in b
+  __ load_ptr( 2, rax);  // load b
+  __ store_ptr(2, rcx);  // store a in b
   // stack: ..., c, a, c, c
-  __ store_ptr_and_tag(1, rax, rdx); // store b in c
+  __ store_ptr(1, rax);  // store b in c
   // stack: ..., c, a, b, c
 }
 
 void TemplateTable::dup2() {
   transition(vtos, vtos);
   // stack: ..., a, b
-  __ load_ptr_and_tag(1, rax, rdx);  // load a
-  __ push_ptr(rax, rdx);             // push a
-  __ load_ptr_and_tag(1, rax, rdx);  // load b
-  __ push_ptr(rax, rdx);             // push b
+  __ load_ptr(1, rax);  // load a
+  __ push_ptr(rax);     // push a
+  __ load_ptr(1, rax);  // load b
+  __ push_ptr(rax);     // push b
   // stack: ..., a, b, a, b
 }
 
 void TemplateTable::dup2_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b, c
-  __ load_ptr_and_tag(0, rcx, rbx);  // load c
-  __ load_ptr_and_tag(1, rax, rdx);  // load b
-  __ push_ptr(rax, rdx);             // push b
-  __ push_ptr(rcx, rbx);             // push c
+  __ load_ptr( 0, rcx);  // load c
+  __ load_ptr( 1, rax);  // load b
+  __ push_ptr(rax);      // push b
+  __ push_ptr(rcx);      // push c
   // stack: ..., a, b, c, b, c
-  __ store_ptr_and_tag(3, rcx, rbx); // store c in b
+  __ store_ptr(3, rcx);  // store c in b
   // stack: ..., a, c, c, b, c
-  __ load_ptr_and_tag(4, rcx, rbx);  // load a
-  __ store_ptr_and_tag(2, rcx, rbx); // store a in 2nd c
+  __ load_ptr( 4, rcx);  // load a
+  __ store_ptr(2, rcx);  // store a in 2nd c
   // stack: ..., a, c, a, b, c
-  __ store_ptr_and_tag(4, rax, rdx); // store b in a
+  __ store_ptr(4, rax);  // store b in a
   // stack: ..., b, c, a, b, c
 }
 
 void TemplateTable::dup2_x2() {
   transition(vtos, vtos);
   // stack: ..., a, b, c, d
-  __ load_ptr_and_tag(0, rcx, rbx);  // load d
-  __ load_ptr_and_tag(1, rax, rdx);  // load c
-  __ push_ptr(rax, rdx);             // push c
-  __ push_ptr(rcx, rbx);             // push d
+  __ load_ptr( 0, rcx);  // load d
+  __ load_ptr( 1, rax);  // load c
+  __ push_ptr(rax);      // push c
+  __ push_ptr(rcx);      // push d
   // stack: ..., a, b, c, d, c, d
-  __ load_ptr_and_tag(4, rax, rdx);  // load b
-  __ store_ptr_and_tag(2, rax, rdx); // store b in d
-  __ store_ptr_and_tag(4, rcx, rbx); // store d in b
+  __ load_ptr( 4, rax);  // load b
+  __ store_ptr(2, rax);  // store b in d
+  __ store_ptr(4, rcx);  // store d in b
   // stack: ..., a, d, c, b, c, d
-  __ load_ptr_and_tag(5, rcx, rbx);  // load a
-  __ load_ptr_and_tag(3, rax, rdx);  // load c
-  __ store_ptr_and_tag(3, rcx, rbx); // store a in c
-  __ store_ptr_and_tag(5, rax, rdx); // store c in a
+  __ load_ptr( 5, rcx);  // load a
+  __ load_ptr( 3, rax);  // load c
+  __ store_ptr(3, rcx);  // store a in c
+  __ store_ptr(5, rax);  // store c in a
   // stack: ..., c, d, a, b, c, d
 }
 
 void TemplateTable::swap() {
   transition(vtos, vtos);
   // stack: ..., a, b
-  __ load_ptr_and_tag(1, rcx, rbx);  // load a
-  __ load_ptr_and_tag(0, rax, rdx);  // load b
-  __ store_ptr_and_tag(0, rcx, rbx); // store a in b
-  __ store_ptr_and_tag(1, rax, rdx); // store b in a
+  __ load_ptr( 1, rcx);  // load a
+  __ load_ptr( 0, rax);  // load b
+  __ store_ptr(0, rcx);  // store a in b
+  __ store_ptr(1, rax);  // store b in a
   // stack: ..., b, a
 }
 
@@ -1156,12 +1120,12 @@
 void TemplateTable::lop2(Operation op) {
   transition(ltos, ltos);
   switch (op) {
-  case add  :                    __ pop_l(rdx); __ addptr (rax, rdx); break;
-  case sub  : __ mov(rdx, rax);  __ pop_l(rax); __ subptr (rax, rdx); break;
-  case _and :                    __ pop_l(rdx); __ andptr (rax, rdx); break;
-  case _or  :                    __ pop_l(rdx); __ orptr  (rax, rdx); break;
-  case _xor :                    __ pop_l(rdx); __ xorptr (rax, rdx); break;
-  default : ShouldNotReachHere();
+  case add  :                    __ pop_l(rdx); __ addptr(rax, rdx); break;
+  case sub  : __ mov(rdx, rax);  __ pop_l(rax); __ subptr(rax, rdx); break;
+  case _and :                    __ pop_l(rdx); __ andptr(rax, rdx); break;
+  case _or  :                    __ pop_l(rdx); __ orptr (rax, rdx); break;
+  case _xor :                    __ pop_l(rdx); __ xorptr(rax, rdx); break;
+  default   : ShouldNotReachHere();
   }
 }
 
@@ -1250,7 +1214,7 @@
   switch (op) {
   case add:
     __ addss(xmm0, at_rsp());
-    __ addptr(rsp, Interpreter::stackElementSize());
+    __ addptr(rsp, Interpreter::stackElementSize);
     break;
   case sub:
     __ movflt(xmm1, xmm0);
@@ -1259,7 +1223,7 @@
     break;
   case mul:
     __ mulss(xmm0, at_rsp());
-    __ addptr(rsp, Interpreter::stackElementSize());
+    __ addptr(rsp, Interpreter::stackElementSize);
     break;
   case div:
     __ movflt(xmm1, xmm0);
@@ -1282,7 +1246,7 @@
   switch (op) {
   case add:
     __ addsd(xmm0, at_rsp());
-    __ addptr(rsp, 2 * Interpreter::stackElementSize());
+    __ addptr(rsp, 2 * Interpreter::stackElementSize);
     break;
   case sub:
     __ movdbl(xmm1, xmm0);
@@ -1291,7 +1255,7 @@
     break;
   case mul:
     __ mulsd(xmm0, at_rsp());
-    __ addptr(rsp, 2 * Interpreter::stackElementSize());
+    __ addptr(rsp, 2 * Interpreter::stackElementSize);
     break;
   case div:
     __ movdbl(xmm1, xmm0);
@@ -2782,7 +2746,6 @@
 
   // get receiver
   __ movptr(rax, aaddress(0));
-  debug_only(__ verify_local_tag(frame::TagReference, 0));
   // access constant pool cache
   __ get_cache_and_index_at_bcp(rcx, rdx, 2);
   __ movptr(rbx,
@@ -2858,7 +2821,6 @@
   if (load_receiver) {
     __ movl(recv, flags);
     __ andl(recv, 0xFF);
-    if (TaggedStackInterpreter) __ shll(recv, 1);  // index*2
     Address recv_addr(rsp, recv, Address::times_8, -Interpreter::expr_offset_in_bytes(1));
     __ movptr(recv, recv_addr);
     __ verify_oop(recv);
@@ -3610,13 +3572,11 @@
   __ load_unsigned_byte(rax, at_bcp(3)); // get number of dimensions
   // last dim is on top of stack; we want address of first one:
   // first_addr = last_addr + (ndims - 1) * wordSize
-  if (TaggedStackInterpreter) __ shll(rax, 1);  // index*2
   __ lea(c_rarg1, Address(rsp, rax, Address::times_8, -wordSize));
   call_VM(rax,
           CAST_FROM_FN_PTR(address, InterpreterRuntime::multianewarray),
           c_rarg1);
   __ load_unsigned_byte(rbx, at_bcp(3));
-  if (TaggedStackInterpreter) __ shll(rbx, 1);  // index*2
   __ lea(rsp, Address(rsp, rbx, Address::times_8));
 }
 #endif // !CC_INTERP
--- a/src/cpu/zero/vm/interpreter_zero.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/cpu/zero/vm/interpreter_zero.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2003-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * Copyright 2007, 2008 Red Hat, Inc.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -38,24 +38,12 @@
   static int expr_index_at(int i) {
     return stackElementWords() * i;
   }
-  static int expr_tag_index_at(int i) {
-    assert(TaggedStackInterpreter, "should not call this");
-    Unimplemented();
-  }
 
   static int expr_offset_in_bytes(int i) {
     return stackElementSize() * i;
   }
-  static int expr_tag_offset_in_bytes(int i) {
-    assert(TaggedStackInterpreter, "should not call this");
-    Unimplemented();
-  }
 
   static int local_index_at(int i) {
     assert(i <= 0, "local direction already negated");
-    return stackElementWords() * i + (value_offset_in_bytes() / wordSize);
+    return stackElementWords() * i;
   }
-  static int local_tag_index_at(int i) {
-    assert(TaggedStackInterpreter, "should not call this");
-    Unimplemented();
-  }
--- a/src/os_cpu/linux_x86/vm/globals_linux_x86.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/os_cpu/linux_x86/vm/globals_linux_x86.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2000-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,9 +30,9 @@
 define_pd_global(intx, ThreadStackSize,          1024); // 0 => use system default
 define_pd_global(intx, VMThreadStackSize,        1024);
 #else
-// ThreadStackSize 320 allows TaggedStackInterpreter and a couple of test cases
-// to run while keeping the number of threads that can be created high.
-// System default ThreadStackSize appears to be 512 which is too big.
+// ThreadStackSize 320 allows a couple of test cases to run while
+// keeping the number of threads that can be created high.  System
+// default ThreadStackSize appears to be 512 which is too big.
 define_pd_global(intx, ThreadStackSize,          320);
 define_pd_global(intx, VMThreadStackSize,        512);
 #endif // AMD64
--- a/src/os_cpu/solaris_x86/vm/globals_solaris_x86.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/os_cpu/solaris_x86/vm/globals_solaris_x86.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2000-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -31,8 +31,8 @@
 define_pd_global(intx, VMThreadStackSize,        1024);
 define_pd_global(uintx,JVMInvokeMethodSlack,     8*K);
 #else
-// ThreadStackSize 320 allows TaggedStackInterpreter and a couple of test cases
-// to run while keeping the number of threads that can be created high.
+// ThreadStackSize 320 allows a couple of test cases to run while
+// keeping the number of threads that can be created high.
 define_pd_global(intx, ThreadStackSize,          320);
 define_pd_global(intx, VMThreadStackSize,        512);
 define_pd_global(uintx,JVMInvokeMethodSlack,     10*K);
--- a/src/share/vm/interpreter/abstractInterpreter.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/interpreter/abstractInterpreter.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -167,60 +167,15 @@
   // Debugging/printing
   static void       print();                                    // prints the interpreter code
 
-  // Support for Tagged Stacks
-  //
-  // Tags are stored on the Java Expression stack above the value:
-  //
-  //  tag
-  //  value
-  //
-  // For double values:
-  //
-  //  tag2
-  //  high word
-  //  tag1
-  //  low word
-
  public:
-  static int stackElementWords()   { return TaggedStackInterpreter ? 2 : 1; }
-  static int stackElementSize()    { return stackElementWords()*wordSize; }
-  static int logStackElementSize() { return
-                 TaggedStackInterpreter? LogBytesPerWord+1 : LogBytesPerWord; }
-
-  // Tag is at pointer, value is one below for a stack growing down
-  // (or above for stack growing up)
-  static int  value_offset_in_bytes()  {
-    return TaggedStackInterpreter ?
-      frame::interpreter_frame_expression_stack_direction() * wordSize : 0;
-  }
-  static int  tag_offset_in_bytes()    {
-    assert(TaggedStackInterpreter, "should not call this");
-    return 0;
-  }
-
-  // Tagged Locals
-  // Locals are stored relative to Llocals:
-  //
-  // tag    <- Llocals[n]
-  // value
-  //
-  // Category 2 types are indexed as:
-  //
-  // tag    <- Llocals[-n]
-  // high word
-  // tag    <- Llocals[-n+1]
-  // low word
-  //
+  // Interpreter helpers
+  const static int stackElementWords   = 1;
+  const static int stackElementSize    = stackElementWords * wordSize;
+  const static int logStackElementSize = LogBytesPerWord;
 
   // Local values relative to locals[n]
   static int  local_offset_in_bytes(int n) {
-    return ((frame::interpreter_frame_expression_stack_direction() * n) *
-            stackElementSize()) + value_offset_in_bytes();
-  }
-  static int  local_tag_offset_in_bytes(int n) {
-    assert(TaggedStackInterpreter, "should not call this");
-    return ((frame::interpreter_frame_expression_stack_direction() * n) *
-            stackElementSize()) + tag_offset_in_bytes();
+    return ((frame::interpreter_frame_expression_stack_direction() * n) * stackElementSize);
   }
 
   // access to stacked values according to type:
@@ -237,29 +192,15 @@
   static jlong long_in_slot(intptr_t* slot_addr) {
     if (sizeof(intptr_t) >= sizeof(jlong)) {
       return *(jlong*) slot_addr;
-    } else if (!TaggedStackInterpreter) {
+    } else {
       return Bytes::get_native_u8((address)slot_addr);
-    } else {
-      assert(sizeof(intptr_t) * 2 == sizeof(jlong), "ILP32");
-      // assemble the long in memory order (not arithmetic order)
-      union { jlong j; jint i[2]; } u;
-      u.i[0] = (jint) slot_addr[0*stackElementSize()];
-      u.i[1] = (jint) slot_addr[1*stackElementSize()];
-      return u.j;
     }
   }
   static void set_long_in_slot(intptr_t* slot_addr, jlong value) {
     if (sizeof(intptr_t) >= sizeof(jlong)) {
       *(jlong*) slot_addr = value;
-    } else if (!TaggedStackInterpreter) {
+    } else {
       Bytes::put_native_u8((address)slot_addr, value);
-    } else {
-      assert(sizeof(intptr_t) * 2 == sizeof(jlong), "ILP32");
-      // assemble the long in memory order (not arithmetic order)
-      union { jlong j; jint i[2]; } u;
-      u.j = value;
-      slot_addr[0*stackElementSize()] = (intptr_t) u.i[0];
-      slot_addr[1*stackElementSize()] = (intptr_t) u.i[1];
     }
   }
   static void get_jvalue_in_slot(intptr_t* slot_addr, BasicType type, jvalue* value) {
--- a/src/share/vm/interpreter/bytecodeInterpreter.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/interpreter/bytecodeInterpreter.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 2002-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -2692,219 +2692,141 @@
 // The implementations are platform dependent. We have to worry about alignment
 // issues on some machines which can change on the same platform depending on
 // whether it is an LP64 machine also.
-#ifdef ASSERT
-void BytecodeInterpreter::verify_stack_tag(intptr_t *tos, frame::Tag tag, int offset) {
-  if (TaggedStackInterpreter) {
-    frame::Tag t = (frame::Tag)tos[Interpreter::expr_tag_index_at(-offset)];
-    assert(t == tag, "stack tag mismatch");
-  }
-}
-#endif // ASSERT
-
 address BytecodeInterpreter::stack_slot(intptr_t *tos, int offset) {
-  debug_only(verify_stack_tag(tos, frame::TagValue, offset));
   return (address) tos[Interpreter::expr_index_at(-offset)];
 }
 
 jint BytecodeInterpreter::stack_int(intptr_t *tos, int offset) {
-  debug_only(verify_stack_tag(tos, frame::TagValue, offset));
   return *((jint*) &tos[Interpreter::expr_index_at(-offset)]);
 }
 
 jfloat BytecodeInterpreter::stack_float(intptr_t *tos, int offset) {
-  debug_only(verify_stack_tag(tos, frame::TagValue, offset));
   return *((jfloat *) &tos[Interpreter::expr_index_at(-offset)]);
 }
 
 oop BytecodeInterpreter::stack_object(intptr_t *tos, int offset) {
-  debug_only(verify_stack_tag(tos, frame::TagReference, offset));
   return (oop)tos [Interpreter::expr_index_at(-offset)];
 }
 
 jdouble BytecodeInterpreter::stack_double(intptr_t *tos, int offset) {
-  debug_only(verify_stack_tag(tos, frame::TagValue, offset));
-  debug_only(verify_stack_tag(tos, frame::TagValue, offset-1));
   return ((VMJavaVal64*) &tos[Interpreter::expr_index_at(-offset)])->d;
 }
 
 jlong BytecodeInterpreter::stack_long(intptr_t *tos, int offset) {
-  debug_only(verify_stack_tag(tos, frame::TagValue, offset));
-  debug_only(verify_stack_tag(tos, frame::TagValue, offset-1));
   return ((VMJavaVal64 *) &tos[Interpreter::expr_index_at(-offset)])->l;
 }
 
-void BytecodeInterpreter::tag_stack(intptr_t *tos, frame::Tag tag, int offset) {
-  if (TaggedStackInterpreter)
-    tos[Interpreter::expr_tag_index_at(-offset)] = (intptr_t)tag;
-}
-
 // only used for value types
 void BytecodeInterpreter::set_stack_slot(intptr_t *tos, address value,
                                                         int offset) {
-  tag_stack(tos, frame::TagValue, offset);
   *((address *)&tos[Interpreter::expr_index_at(-offset)]) = value;
 }
 
 void BytecodeInterpreter::set_stack_int(intptr_t *tos, int value,
                                                        int offset) {
-  tag_stack(tos, frame::TagValue, offset);
   *((jint *)&tos[Interpreter::expr_index_at(-offset)]) = value;
 }
 
 void BytecodeInterpreter::set_stack_float(intptr_t *tos, jfloat value,
                                                          int offset) {
-  tag_stack(tos, frame::TagValue, offset);
   *((jfloat *)&tos[Interpreter::expr_index_at(-offset)]) = value;
 }
 
 void BytecodeInterpreter::set_stack_object(intptr_t *tos, oop value,
                                                           int offset) {
-  tag_stack(tos, frame::TagReference, offset);
   *((oop *)&tos[Interpreter::expr_index_at(-offset)]) = value;
 }
 
 // needs to be platform dep for the 32 bit platforms.
 void BytecodeInterpreter::set_stack_double(intptr_t *tos, jdouble value,
                                                           int offset) {
-  tag_stack(tos, frame::TagValue, offset);
-  tag_stack(tos, frame::TagValue, offset-1);
   ((VMJavaVal64*)&tos[Interpreter::expr_index_at(-offset)])->d = value;
 }
 
 void BytecodeInterpreter::set_stack_double_from_addr(intptr_t *tos,
                                               address addr, int offset) {
-  tag_stack(tos, frame::TagValue, offset);
-  tag_stack(tos, frame::TagValue, offset-1);
   (((VMJavaVal64*)&tos[Interpreter::expr_index_at(-offset)])->d =
                         ((VMJavaVal64*)addr)->d);
 }
 
 void BytecodeInterpreter::set_stack_long(intptr_t *tos, jlong value,
                                                         int offset) {
-  tag_stack(tos, frame::TagValue, offset);
   ((VMJavaVal64*)&tos[Interpreter::expr_index_at(-offset+1)])->l = 0xdeedbeeb;
-  tag_stack(tos, frame::TagValue, offset-1);
   ((VMJavaVal64*)&tos[Interpreter::expr_index_at(-offset)])->l = value;
 }
 
 void BytecodeInterpreter::set_stack_long_from_addr(intptr_t *tos,
                                             address addr, int offset) {
-  tag_stack(tos, frame::TagValue, offset);
   ((VMJavaVal64*)&tos[Interpreter::expr_index_at(-offset+1)])->l = 0xdeedbeeb;
-  tag_stack(tos, frame::TagValue, offset-1);
   ((VMJavaVal64*)&tos[Interpreter::expr_index_at(-offset)])->l =
                         ((VMJavaVal64*)addr)->l;
 }
 
 // Locals
 
-#ifdef ASSERT
-void BytecodeInterpreter::verify_locals_tag(intptr_t *locals, frame::Tag tag,
-                                     int offset) {
-  if (TaggedStackInterpreter) {
-    frame::Tag t = (frame::Tag)locals[Interpreter::local_tag_index_at(-offset)];
-    assert(t == tag, "locals tag mismatch");
-  }
-}
-#endif // ASSERT
 address BytecodeInterpreter::locals_slot(intptr_t* locals, int offset) {
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset));
   return (address)locals[Interpreter::local_index_at(-offset)];
 }
 jint BytecodeInterpreter::locals_int(intptr_t* locals, int offset) {
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset));
   return (jint)locals[Interpreter::local_index_at(-offset)];
 }
 jfloat BytecodeInterpreter::locals_float(intptr_t* locals, int offset) {
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset));
   return (jfloat)locals[Interpreter::local_index_at(-offset)];
 }
 oop BytecodeInterpreter::locals_object(intptr_t* locals, int offset) {
-  debug_only(verify_locals_tag(locals, frame::TagReference, offset));
   return (oop)locals[Interpreter::local_index_at(-offset)];
 }
 jdouble BytecodeInterpreter::locals_double(intptr_t* locals, int offset) {
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset));
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset));
   return ((VMJavaVal64*)&locals[Interpreter::local_index_at(-(offset+1))])->d;
 }
 jlong BytecodeInterpreter::locals_long(intptr_t* locals, int offset) {
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset));
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset+1));
   return ((VMJavaVal64*)&locals[Interpreter::local_index_at(-(offset+1))])->l;
 }
 
 // Returns the address of locals value.
 address BytecodeInterpreter::locals_long_at(intptr_t* locals, int offset) {
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset));
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset+1));
   return ((address)&locals[Interpreter::local_index_at(-(offset+1))]);
 }
 address BytecodeInterpreter::locals_double_at(intptr_t* locals, int offset) {
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset));
-  debug_only(verify_locals_tag(locals, frame::TagValue, offset+1));
   return ((address)&locals[Interpreter::local_index_at(-(offset+1))]);
 }
 
-void BytecodeInterpreter::tag_locals(intptr_t *locals, frame::Tag tag, int offset) {
-  if (TaggedStackInterpreter)
-    locals[Interpreter::local_tag_index_at(-offset)] = (intptr_t)tag;
-}
-
 // Used for local value or returnAddress
 void BytecodeInterpreter::set_locals_slot(intptr_t *locals,
                                    address value, int offset) {
-  tag_locals(locals, frame::TagValue, offset);
   *((address*)&locals[Interpreter::local_index_at(-offset)]) = value;
 }
 void BytecodeInterpreter::set_locals_int(intptr_t *locals,
                                    jint value, int offset) {
-  tag_locals(locals, frame::TagValue, offset);
   *((jint *)&locals[Interpreter::local_index_at(-offset)]) = value;
 }
 void BytecodeInterpreter::set_locals_float(intptr_t *locals,
                                    jfloat value, int offset) {
-  tag_locals(locals, frame::TagValue, offset);
   *((jfloat *)&locals[Interpreter::local_index_at(-offset)]) = value;
 }
 void BytecodeInterpreter::set_locals_object(intptr_t *locals,
                                    oop value, int offset) {
-  tag_locals(locals, frame::TagReference, offset);
   *((oop *)&locals[Interpreter::local_index_at(-offset)]) = value;
 }
 void BytecodeInterpreter::set_locals_double(intptr_t *locals,
                                    jdouble value, int offset) {
-  tag_locals(locals, frame::TagValue, offset);
-  tag_locals(locals, frame::TagValue, offset+1);
   ((VMJavaVal64*)&locals[Interpreter::local_index_at(-(offset+1))])->d = value;
 }
 void BytecodeInterpreter::set_locals_long(intptr_t *locals,
                                    jlong value, int offset) {
-  tag_locals(locals, frame::TagValue, offset);
-  tag_locals(locals, frame::TagValue, offset+1);
   ((VMJavaVal64*)&locals[Interpreter::local_index_at(-(offset+1))])->l = value;
 }
 void BytecodeInterpreter::set_locals_double_from_addr(intptr_t *locals,
                                    address addr, int offset) {
-  tag_locals(locals, frame::TagValue, offset);
-  tag_locals(locals, frame::TagValue, offset+1);
   ((VMJavaVal64*)&locals[Interpreter::local_index_at(-(offset+1))])->d = ((VMJavaVal64*)addr)->d;
 }
 void BytecodeInterpreter::set_locals_long_from_addr(intptr_t *locals,
                                    address addr, int offset) {
-  tag_locals(locals, frame::TagValue, offset);
-  tag_locals(locals, frame::TagValue, offset+1);
   ((VMJavaVal64*)&locals[Interpreter::local_index_at(-(offset+1))])->l = ((VMJavaVal64*)addr)->l;
 }
 
 void BytecodeInterpreter::astore(intptr_t* tos,    int stack_offset,
                           intptr_t* locals, int locals_offset) {
-  // Copy tag from stack to locals.  astore's operand can be returnAddress
-  // and may not be TagReference
-  if (TaggedStackInterpreter) {
-    frame::Tag t = (frame::Tag) tos[Interpreter::expr_tag_index_at(-stack_offset)];
-    locals[Interpreter::local_tag_index_at(-locals_offset)] = (intptr_t)t;
-  }
   intptr_t value = tos[Interpreter::expr_index_at(-stack_offset)];
   locals[Interpreter::local_index_at(-locals_offset)] = value;
 }
@@ -2912,10 +2834,6 @@
 
 void BytecodeInterpreter::copy_stack_slot(intptr_t *tos, int from_offset,
                                    int to_offset) {
-  if (TaggedStackInterpreter) {
-    tos[Interpreter::expr_tag_index_at(-to_offset)] =
-                      (intptr_t)tos[Interpreter::expr_tag_index_at(-from_offset)];
-  }
   tos[Interpreter::expr_index_at(-to_offset)] =
                       (intptr_t)tos[Interpreter::expr_index_at(-from_offset)];
 }
@@ -2964,16 +2882,9 @@
 void BytecodeInterpreter::swap(intptr_t *tos) {
   // swap top two elements
   intptr_t val = tos[Interpreter::expr_index_at(1)];
-  frame::Tag t;
-  if (TaggedStackInterpreter) {
-    t = (frame::Tag) tos[Interpreter::expr_tag_index_at(1)];
-  }
   // Copy -2 entry to -1
   copy_stack_slot(tos, -2, -1);
   // Store saved -1 entry into -2
-  if (TaggedStackInterpreter) {
-    tos[Interpreter::expr_tag_index_at(2)] = (intptr_t)t;
-  }
   tos[Interpreter::expr_index_at(2)] = val;
 }
 // --------------------------------------------------------------------------------
--- a/src/share/vm/interpreter/interpreterRuntime.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/interpreter/interpreterRuntime.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1067,7 +1067,7 @@
   jlong_accessor u;
   jint* newval = (jint*)value;
   u.words[0] = newval[0];
-  u.words[1] = newval[Interpreter::stackElementWords()]; // skip if tag
+  u.words[1] = newval[Interpreter::stackElementWords]; // skip if tag
   fvalue.j = u.long_value;
 #endif // _LP64
 
@@ -1252,6 +1252,6 @@
   ArgumentSizeComputer asc(invoke->signature());
   int size_of_arguments = (asc.size() + (invoke->has_receiver() ? 1 : 0)); // receiver
   Copy::conjoint_bytes(src_address, dest_address,
-                       size_of_arguments * Interpreter::stackElementSize());
+                       size_of_arguments * Interpreter::stackElementSize);
 IRT_END
 #endif
--- a/src/share/vm/oops/methodOop.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/oops/methodOop.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -306,7 +306,7 @@
 
 int methodOopDesc::extra_stack_words() {
   // not an inline function, to avoid a header dependency on Interpreter
-  return extra_stack_entries() * Interpreter::stackElementSize();
+  return extra_stack_entries() * Interpreter::stackElementSize;
 }
 
 
--- a/src/share/vm/prims/methodHandles.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/prims/methodHandles.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -163,7 +163,7 @@
     default: ShouldNotReachHere();
     }
     // Return the size of the stack slots to move in bytes.
-    swap_bytes = swap_slots * Interpreter::stackElementSize();
+    swap_bytes = swap_slots * Interpreter::stackElementSize;
   }
 
   static int get_ek_adapter_opt_spread_info(EntryKind ek) {
@@ -219,7 +219,7 @@
   // Offset in words that the interpreter stack pointer moves when an argument is pushed.
   // The stack_move value must always be a multiple of this.
   static int stack_move_unit() {
-    return frame::interpreter_frame_expression_stack_direction() * Interpreter::stackElementWords();
+    return frame::interpreter_frame_expression_stack_direction() * Interpreter::stackElementWords;
   }
 
   enum { CONV_VMINFO_SIGN_FLAG = 0x80 };
--- a/src/share/vm/runtime/arguments.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/runtime/arguments.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -2867,12 +2867,6 @@
   }
 #endif // _LP64
 
-  // MethodHandles code does not support TaggedStackInterpreter.
-  if (EnableMethodHandles && TaggedStackInterpreter) {
-    warning("TaggedStackInterpreter is not supported by MethodHandles code.  Disabling TaggedStackInterpreter.");
-    TaggedStackInterpreter = false;
-  }
-
   // Check the GC selections again.
   if (!check_gc_consistency()) {
     return JNI_EINVAL;
@@ -2915,11 +2909,6 @@
   LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
 #endif // CC_INTERP
 
-#ifdef ZERO
-  // Clear flags not supported by Zero
-  FLAG_SET_DEFAULT(TaggedStackInterpreter, false);
-#endif // ZERO
-
 #ifdef COMPILER2
   if (!UseBiasedLocking || EmitSync != 0) {
     UseOptoBiasInlining = false;
--- a/src/share/vm/runtime/frame.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/runtime/frame.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -468,42 +468,16 @@
   return &((*interpreter_frame_locals_addr())[n]);
 }
 
-frame::Tag frame::interpreter_frame_local_tag(int index) const {
-  const int n = Interpreter::local_tag_offset_in_bytes(index)/wordSize;
-  return (Tag)(*interpreter_frame_locals_addr()) [n];
-}
-
-void frame::interpreter_frame_set_local_tag(int index, Tag tag) const {
-  const int n = Interpreter::local_tag_offset_in_bytes(index)/wordSize;
-  (*interpreter_frame_locals_addr())[n] = (intptr_t)tag;
-}
-
 intptr_t* frame::interpreter_frame_expression_stack_at(jint offset) const {
   const int i = offset * interpreter_frame_expression_stack_direction();
-  const int n = ((i * Interpreter::stackElementSize()) +
-                 Interpreter::value_offset_in_bytes())/wordSize;
+  const int n = i * Interpreter::stackElementWords;
   return &(interpreter_frame_expression_stack()[n]);
 }
 
-frame::Tag frame::interpreter_frame_expression_stack_tag(jint offset) const {
-  const int i = offset * interpreter_frame_expression_stack_direction();
-  const int n = ((i * Interpreter::stackElementSize()) +
-                 Interpreter::tag_offset_in_bytes())/wordSize;
-  return (Tag)(interpreter_frame_expression_stack()[n]);
-}
-
-void frame::interpreter_frame_set_expression_stack_tag(jint offset,
-                                                       Tag tag) const {
-  const int i = offset * interpreter_frame_expression_stack_direction();
-  const int n = ((i * Interpreter::stackElementSize()) +
-                 Interpreter::tag_offset_in_bytes())/wordSize;
-  interpreter_frame_expression_stack()[n] = (intptr_t)tag;
-}
-
 jint frame::interpreter_frame_expression_stack_size() const {
   // Number of elements on the interpreter expression stack
   // Callers should span by stackElementWords
-  int element_size = Interpreter::stackElementWords();
+  int element_size = Interpreter::stackElementWords;
   if (frame::interpreter_frame_expression_stack_direction() < 0) {
     return (interpreter_frame_expression_stack() -
             interpreter_frame_tos_address() + 1)/element_size;
@@ -585,20 +559,12 @@
   for (i = 0; i < interpreter_frame_method()->max_locals(); i++ ) {
     intptr_t x = *interpreter_frame_local_at(i);
     st->print(" - local  [" INTPTR_FORMAT "]", x);
-    if (TaggedStackInterpreter) {
-      Tag x = interpreter_frame_local_tag(i);
-      st->print(" - local tag [" INTPTR_FORMAT "]", x);
-    }
     st->fill_to(23);
     st->print_cr("; #%d", i);
   }
   for (i = interpreter_frame_expression_stack_size() - 1; i >= 0; --i ) {
     intptr_t x = *interpreter_frame_expression_stack_at(i);
     st->print(" - stack  [" INTPTR_FORMAT "]", x);
-    if (TaggedStackInterpreter) {
-      Tag x = interpreter_frame_expression_stack_tag(i);
-      st->print(" - stack tag [" INTPTR_FORMAT "]", x);
-    }
     st->fill_to(23);
     st->print_cr("; #%d", i);
   }
@@ -950,103 +916,19 @@
     }
   }
 
-  if (TaggedStackInterpreter) {
-    // process locals & expression stack
-    InterpreterOopMap *mask = NULL;
-#ifdef ASSERT
-    InterpreterOopMap oopmap_mask;
-    OopMapCache::compute_one_oop_map(m, bci, &oopmap_mask);
-    mask = &oopmap_mask;
-#endif // ASSERT
-    oops_interpreted_locals_do(f, max_locals, mask);
-    oops_interpreted_expressions_do(f, signature, has_receiver,
-                                    m->max_stack(),
-                                    max_locals, mask);
+  InterpreterFrameClosure blk(this, max_locals, m->max_stack(), f);
+
+  // process locals & expression stack
+  InterpreterOopMap mask;
+  if (query_oop_map_cache) {
+    m->mask_for(bci, &mask);
   } else {
-    InterpreterFrameClosure blk(this, max_locals, m->max_stack(), f);
-
-    // process locals & expression stack
-    InterpreterOopMap mask;
-    if (query_oop_map_cache) {
-      m->mask_for(bci, &mask);
-    } else {
-      OopMapCache::compute_one_oop_map(m, bci, &mask);
-    }
-    mask.iterate_oop(&blk);
+    OopMapCache::compute_one_oop_map(m, bci, &mask);
   }
+  mask.iterate_oop(&blk);
 }
 
 
-void frame::oops_interpreted_locals_do(OopClosure *f,
-                                      int max_locals,
-                                      InterpreterOopMap *mask) {
-  // Process locals then interpreter expression stack
-  for (int i = 0; i < max_locals; i++ ) {
-    Tag tag = interpreter_frame_local_tag(i);
-    if (tag == TagReference) {
-      oop* addr = (oop*) interpreter_frame_local_at(i);
-      assert((intptr_t*)addr >= sp(), "must be inside the frame");
-      f->do_oop(addr);
-#ifdef ASSERT
-    } else {
-      assert(tag == TagValue, "bad tag value for locals");
-      oop* p = (oop*) interpreter_frame_local_at(i);
-      // Not always true - too bad.  May have dead oops without tags in locals.
-      // assert(*p == NULL || !(*p)->is_oop(), "oop not tagged on interpreter locals");
-      assert(*p == NULL || !mask->is_oop(i), "local oop map mismatch");
-#endif // ASSERT
-    }
-  }
-}
-
-void frame::oops_interpreted_expressions_do(OopClosure *f,
-                                      symbolHandle signature,
-                                      bool has_receiver,
-                                      int max_stack,
-                                      int max_locals,
-                                      InterpreterOopMap *mask) {
-  // There is no stack no matter what the esp is pointing to (native methods
-  // might look like expression stack is nonempty).
-  if (max_stack == 0) return;
-
-  // Point the top of the expression stack above arguments to a call so
-  // arguments aren't gc'ed as both stack values for callee and callee
-  // arguments in callee's locals.
-  int args_size = 0;
-  if (!signature.is_null()) {
-    args_size = ArgumentSizeComputer(signature).size() + (has_receiver ? 1 : 0);
-  }
-
-  intptr_t *tos_addr = interpreter_frame_tos_at(args_size);
-  assert(args_size != 0 || tos_addr == interpreter_frame_tos_address(), "these are same");
-  intptr_t *frst_expr = interpreter_frame_expression_stack_at(0);
-  // In case of exceptions, the expression stack is invalid and the esp
-  // will be reset to express this condition. Therefore, we call f only
-  // if addr is 'inside' the stack (i.e., addr >= esp for Intel).
-  bool in_stack;
-  if (interpreter_frame_expression_stack_direction() > 0) {
-    in_stack = (intptr_t*)frst_expr <= tos_addr;
-  } else {
-    in_stack = (intptr_t*)frst_expr >= tos_addr;
-  }
-  if (!in_stack) return;
-
-  jint stack_size = interpreter_frame_expression_stack_size() - args_size;
-  for (int j = 0; j < stack_size; j++) {
-    Tag tag = interpreter_frame_expression_stack_tag(j);
-    if (tag == TagReference) {
-      oop *addr = (oop*) interpreter_frame_expression_stack_at(j);
-      f->do_oop(addr);
-#ifdef ASSERT
-    } else {
-      assert(tag == TagValue, "bad tag value for stack element");
-      oop *p = (oop*) interpreter_frame_expression_stack_at((j));
-      assert(*p == NULL || !mask->is_oop(j+max_locals), "stack oop map mismatch");
-#endif // ASSERT
-    }
-  }
-}
-
 void frame::oops_interpreted_arguments_do(symbolHandle signature, bool has_receiver, OopClosure* f) {
   InterpretedArgumentOopFinder finder(signature, has_receiver, this, f);
   finder.oops_do();
@@ -1306,29 +1188,18 @@
 
   int max_locals = m->is_native() ? m->size_of_parameters() : m->max_locals();
 
-  if (TaggedStackInterpreter) {
-    InterpreterOopMap *mask = NULL;
-#ifdef ASSERT
-    InterpreterOopMap oopmap_mask;
-    methodHandle method(thread, m);
-    OopMapCache::compute_one_oop_map(method, bci, &oopmap_mask);
-    mask = &oopmap_mask;
-#endif // ASSERT
-    oops_interpreted_locals_do(&_check_oop, max_locals, mask);
-  } else {
-    // process dynamic part
-    InterpreterFrameClosure value_blk(this, max_locals, m->max_stack(),
-                                      &_check_value);
-    InterpreterFrameClosure   oop_blk(this, max_locals, m->max_stack(),
-                                      &_check_oop  );
-    InterpreterFrameClosure  dead_blk(this, max_locals, m->max_stack(),
-                                      &_zap_dead   );
+  // process dynamic part
+  InterpreterFrameClosure value_blk(this, max_locals, m->max_stack(),
+                                    &_check_value);
+  InterpreterFrameClosure   oop_blk(this, max_locals, m->max_stack(),
+                                    &_check_oop  );
+  InterpreterFrameClosure  dead_blk(this, max_locals, m->max_stack(),
+                                    &_zap_dead   );
 
-    // get frame map
-    InterpreterOopMap mask;
-    m->mask_for(bci, &mask);
-    mask.iterate_all( &oop_blk, &value_blk, &dead_blk);
-  }
+  // get frame map
+  InterpreterOopMap mask;
+  m->mask_for(bci, &mask);
+  mask.iterate_all( &oop_blk, &value_blk, &dead_blk);
 }
 
 
--- a/src/share/vm/runtime/frame.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/runtime/frame.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -191,26 +191,10 @@
   intptr_t*  interpreter_frame_mdx_addr() const;
 
  public:
-  // Tags for TaggedStackInterpreter
-  enum Tag {
-      TagValue = 0,          // Important: must be zero to use G0 on sparc.
-      TagReference = 0x555,  // Reference type - is an oop that needs gc.
-      TagCategory2 = 0x666   // Only used internally by interpreter
-                             // and not written to the java stack.
-      // The values above are chosen so that misuse causes a crash
-      // with a recognizable value.
-  };
-
-  static Tag tag_for_basic_type(BasicType typ) {
-    return (typ == T_OBJECT ? TagReference : TagValue);
-  }
-
   // Locals
 
   // The _at version returns a pointer because the address is used for GC.
   intptr_t* interpreter_frame_local_at(int index) const;
-  Tag       interpreter_frame_local_tag(int index) const;
-  void      interpreter_frame_set_local_tag(int index, Tag tag) const;
 
   void interpreter_frame_set_locals(intptr_t* locs);
 
@@ -260,8 +244,6 @@
 
   // The _at version returns a pointer because the address is used for GC.
   intptr_t* interpreter_frame_expression_stack_at(jint offset) const;
-  Tag       interpreter_frame_expression_stack_tag(jint offset) const;
-  void      interpreter_frame_set_expression_stack_tag(jint offset, Tag tag) const;
 
   // top of expression stack
   intptr_t* interpreter_frame_tos_at(jint offset) const;
@@ -375,12 +357,6 @@
   void oops_interpreted_do(OopClosure* f, const RegisterMap* map, bool query_oop_map_cache = true);
 
  private:
-  void oops_interpreted_locals_do(OopClosure *f,
-                                 int max_locals,
-                                 InterpreterOopMap *mask);
-  void oops_interpreted_expressions_do(OopClosure *f, symbolHandle signature,
-                                 bool has_receiver, int max_stack, int max_locals,
-                                 InterpreterOopMap *mask);
   void oops_interpreted_arguments_do(symbolHandle signature, bool has_receiver, OopClosure* f);
 
   // Iteration of oops
--- a/src/share/vm/runtime/globals.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/runtime/globals.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -3497,9 +3497,6 @@
   develop(bool, TraceInvokeDynamic, false,                                  \
           "trace internal invoke dynamic operations")                       \
                                                                             \
-  product(bool, TaggedStackInterpreter, false,                              \
-          "Insert tags in interpreter execution stack for oopmap generaion")\
-                                                                            \
   diagnostic(bool, PauseAtStartup,      false,                              \
           "Causes the VM to pause at startup time and wait for the pause "  \
           "file to be removed (default: ./vm.paused.<pid>)")                \
--- a/src/share/vm/runtime/javaCalls.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/runtime/javaCalls.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * Copyright 1997-2010 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -417,17 +417,9 @@
       // Handle conversion
       _value[i] = (intptr_t)Handle::raw_resolve((oop *)_value[i]);
     }
-    // The parameters are moved to the parameters array to include the tags.
-    if (TaggedStackInterpreter) {
-      // Tags are interspersed with arguments.  Tags are first.
-      int tagged_index = i*2;
-      _parameters[tagged_index]   = _is_oop[i] ? frame::TagReference :
-                                                 frame::TagValue;
-      _parameters[tagged_index+1] = _value[i];
-    }
   }
   // Return argument vector
-  return TaggedStackInterpreter ? _parameters : _value;
+  return _value;
 }
 
 
--- a/src/share/vm/runtime/javaCalls.hpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/runtime/javaCalls.hpp	Fri Apr 30 08:37:24 2010 -0700
@@ -66,11 +66,9 @@
   };
 
   intptr_t    _value_buffer [_default_size + 1];
-  intptr_t    _parameter_buffer [_default_size*2 + 1];
   bool        _is_oop_buffer[_default_size + 1];
 
   intptr_t*   _value;
-  intptr_t*   _parameters;
   bool*       _is_oop;
   int         _size;
   int         _max_size;
@@ -81,7 +79,6 @@
     _value    = &_value_buffer[1];
     _is_oop   = &_is_oop_buffer[1];
 
-    _parameters = &_parameter_buffer[0];
     _max_size = _default_size;
     _size = 0;
     _start_at_zero = false;
@@ -99,11 +96,10 @@
     if (max_size > _default_size) {
       _value  = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1);
       _is_oop = NEW_RESOURCE_ARRAY(bool, max_size + 1);
-      if (TaggedStackInterpreter) {
-        _parameters  = NEW_RESOURCE_ARRAY(intptr_t, max_size*2 + 1);
-      }
+
       // Reserve room for potential receiver in value and is_oop
       _value++; _is_oop++;
+
       _max_size = max_size;
       _size = 0;
       _start_at_zero = false;
--- a/src/share/vm/runtime/sharedRuntime.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/runtime/sharedRuntime.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -1842,14 +1842,11 @@
 
       case T_OBJECT:
       case T_ARRAY:
-        if (!TaggedStackInterpreter) {
 #ifdef _LP64
-          return T_LONG;
+        return T_LONG;
 #else
-          return T_INT;
+        return T_INT;
 #endif
-        }
-        return T_OBJECT;
 
       case T_INT:
       case T_LONG:
@@ -2595,17 +2592,9 @@
   // Copy the locals.  Order is preserved so that loading of longs works.
   // Since there's no GC I can copy the oops blindly.
   assert( sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
-  if (TaggedStackInterpreter) {
-    for (int i = 0; i < max_locals; i++) {
-      // copy only each local separately to the buffer avoiding the tag
-      buf[i] = *fr.interpreter_frame_local_at(max_locals-i-1);
-    }
-  } else {
-    Copy::disjoint_words(
-                       (HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
+  Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
                        (HeapWord*)&buf[0],
                        max_locals);
-  }
 
   // Inflate locks.  Copy the displaced headers.  Be careful, there can be holes.
   int i = max_locals;
--- a/src/share/vm/runtime/vframe.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/runtime/vframe.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -244,51 +244,30 @@
   StackValueCollection* result = new StackValueCollection(length);
 
   // Get oopmap describing oops and int for current bci
-  if (TaggedStackInterpreter) {
-    for(int i=0; i < length; i++) {
-      // Find stack location
-      intptr_t *addr = locals_addr_at(i);
+  InterpreterOopMap oop_mask;
+  if (TraceDeoptimization && Verbose) {
+    methodHandle m_h(thread(), method());
+    OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask);
+  } else {
+    method()->mask_for(bci(), &oop_mask);
+  }
+  // handle locals
+  for(int i=0; i < length; i++) {
+    // Find stack location
+    intptr_t *addr = locals_addr_at(i);
 
-      // Depending on oop/int put it in the right package
-      StackValue *sv;
-      frame::Tag tag = fr().interpreter_frame_local_tag(i);
-      if (tag == frame::TagReference) {
-        // oop value
-        Handle h(*(oop *)addr);
-        sv = new StackValue(h);
-      } else {
-        // integer
-        sv = new StackValue(*addr);
-      }
-      assert(sv != NULL, "sanity check");
-      result->add(sv);
+    // Depending on oop/int put it in the right package
+    StackValue *sv;
+    if (oop_mask.is_oop(i)) {
+      // oop value
+      Handle h(*(oop *)addr);
+      sv = new StackValue(h);
+    } else {
+      // integer
+      sv = new StackValue(*addr);
     }
-  } else {
-    InterpreterOopMap oop_mask;
-    if (TraceDeoptimization && Verbose) {
-      methodHandle m_h(thread(), method());
-      OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask);
-    } else {
-      method()->mask_for(bci(), &oop_mask);
-    }
-    // handle locals
-    for(int i=0; i < length; i++) {
-      // Find stack location
-      intptr_t *addr = locals_addr_at(i);
-
-      // Depending on oop/int put it in the right package
-      StackValue *sv;
-      if (oop_mask.is_oop(i)) {
-        // oop value
-        Handle h(*(oop *)addr);
-        sv = new StackValue(h);
-      } else {
-        // integer
-        sv = new StackValue(*addr);
-      }
-      assert(sv != NULL, "sanity check");
-      result->add(sv);
-    }
+    assert(sv != NULL, "sanity check");
+    result->add(sv);
   }
   return result;
 }
@@ -331,53 +310,31 @@
   int nof_locals = method()->max_locals();
   StackValueCollection* result = new StackValueCollection(length);
 
-  if (TaggedStackInterpreter) {
-    // handle expressions
-    for(int i=0; i < length; i++) {
-      // Find stack location
-      intptr_t *addr = fr().interpreter_frame_expression_stack_at(i);
-      frame::Tag tag = fr().interpreter_frame_expression_stack_tag(i);
+  InterpreterOopMap oop_mask;
+  // Get oopmap describing oops and int for current bci
+  if (TraceDeoptimization && Verbose) {
+    methodHandle m_h(method());
+    OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask);
+  } else {
+    method()->mask_for(bci(), &oop_mask);
+  }
+  // handle expressions
+  for(int i=0; i < length; i++) {
+    // Find stack location
+    intptr_t *addr = fr().interpreter_frame_expression_stack_at(i);
 
-      // Depending on oop/int put it in the right package
-      StackValue *sv;
-      if (tag == frame::TagReference) {
-        // oop value
-        Handle h(*(oop *)addr);
-        sv = new StackValue(h);
-      } else {
-        // otherwise
-        sv = new StackValue(*addr);
-      }
-      assert(sv != NULL, "sanity check");
-      result->add(sv);
+    // Depending on oop/int put it in the right package
+    StackValue *sv;
+    if (oop_mask.is_oop(i + nof_locals)) {
+      // oop value
+      Handle h(*(oop *)addr);
+      sv = new StackValue(h);
+    } else {
+      // integer
+      sv = new StackValue(*addr);
     }
-  } else {
-    InterpreterOopMap oop_mask;
-    // Get oopmap describing oops and int for current bci
-    if (TraceDeoptimization && Verbose) {
-      methodHandle m_h(method());
-      OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask);
-    } else {
-      method()->mask_for(bci(), &oop_mask);
-    }
-    // handle expressions
-    for(int i=0; i < length; i++) {
-      // Find stack location
-      intptr_t *addr = fr().interpreter_frame_expression_stack_at(i);
-
-      // Depending on oop/int put it in the right package
-      StackValue *sv;
-      if (oop_mask.is_oop(i + nof_locals)) {
-        // oop value
-        Handle h(*(oop *)addr);
-        sv = new StackValue(h);
-      } else {
-        // integer
-        sv = new StackValue(*addr);
-      }
-      assert(sv != NULL, "sanity check");
-      result->add(sv);
-    }
+    assert(sv != NULL, "sanity check");
+    result->add(sv);
   }
   return result;
 }
--- a/src/share/vm/runtime/vframeArray.cpp	Fri Apr 30 04:27:25 2010 -0700
+++ b/src/share/vm/runtime/vframeArray.cpp	Fri Apr 30 08:37:24 2010 -0700
@@ -309,11 +309,6 @@
       default:
         ShouldNotReachHere();
     }
-    if (TaggedStackInterpreter) {
-      // Write tag to the stack
-      iframe()->interpreter_frame_set_expression_stack_tag(i,
-                                  frame::tag_for_basic_type(value->type()));
-    }
   }
 
 
@@ -335,11 +330,6 @@
       default:
         ShouldNotReachHere();
     }
-    if (TaggedStackInterpreter) {
-      // Write tag to stack
-      iframe()->interpreter_frame_set_local_tag(i,
-                                  frame::tag_for_basic_type(value->type()));
-    }
   }
 
   if (is_top_frame && JvmtiExport::can_pop_frame() && thread->popframe_forcing_deopt_reexecution()) {
@@ -354,9 +344,8 @@
       void* saved_args = thread->popframe_preserved_args();
       assert(saved_args != NULL, "must have been saved by interpreter");
 #ifdef ASSERT
-      int stack_words = Interpreter::stackElementWords();
       assert(popframe_preserved_args_size_in_words <=
-             iframe()->interpreter_frame_expression_stack_size()*stack_words,
+             iframe()->interpreter_frame_expression_stack_size()*Interpreter::stackElementWords,
              "expression stack size should have been extended");
 #endif // ASSERT
       int top_element = iframe()->interpreter_frame_expression_stack_size()-1;