changeset 42910:1196b2e0adca

8171410: aarch64: long multiplyExact shifts by 31 instead of 63 Reviewed-by: aph
author enevill
date Sun, 18 Dec 2016 17:26:44 -0500
parents e440bfad5d9a
children 7f9cad2b64bc
files hotspot/src/cpu/aarch64/vm/aarch64.ad
diffstat 1 files changed, 4 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
--- a/hotspot/src/cpu/aarch64/vm/aarch64.ad	Wed Dec 21 11:51:57 2016 +0300
+++ b/hotspot/src/cpu/aarch64/vm/aarch64.ad	Sun Dec 18 17:26:44 2016 -0500
@@ -14086,7 +14086,7 @@
 
   format %{ "mul   rscratch1, $op1, $op2\t#overflow check long\n\t"
             "smulh rscratch2, $op1, $op2\n\t"
-            "cmp   rscratch2, rscratch1, ASR #31\n\t"
+            "cmp   rscratch2, rscratch1, ASR #63\n\t"
             "movw  rscratch1, #0x80000000\n\t"
             "cselw rscratch1, rscratch1, zr, NE\n\t"
             "cmpw  rscratch1, #1" %}
@@ -14094,7 +14094,7 @@
   ins_encode %{
     __ mul(rscratch1, $op1$$Register, $op2$$Register);   // Result bits 0..63
     __ smulh(rscratch2, $op1$$Register, $op2$$Register); // Result bits 64..127
-    __ cmp(rscratch2, rscratch1, Assembler::ASR, 31);    // Top is pure sign ext
+    __ cmp(rscratch2, rscratch1, Assembler::ASR, 63);    // Top is pure sign ext
     __ movw(rscratch1, 0x80000000);                    // Develop 0 (EQ),
     __ cselw(rscratch1, rscratch1, zr, Assembler::NE); // or 0x80000000 (NE)
     __ cmpw(rscratch1, 1);                             // 0x80000000 - 1 => VS
@@ -14112,7 +14112,7 @@
 
   format %{ "mul   rscratch1, $op1, $op2\t#overflow check long\n\t"
             "smulh rscratch2, $op1, $op2\n\t"
-            "cmp   rscratch2, rscratch1, ASR #31\n\t"
+            "cmp   rscratch2, rscratch1, ASR #63\n\t"
             "b$cmp $labl" %}
   ins_cost(4 * INSN_COST); // Branch is rare so treat as INSN_COST
   ins_encode %{
@@ -14120,7 +14120,7 @@
     Assembler::Condition cond = (Assembler::Condition)$cmp$$cmpcode;
     __ mul(rscratch1, $op1$$Register, $op2$$Register);   // Result bits 0..63
     __ smulh(rscratch2, $op1$$Register, $op2$$Register); // Result bits 64..127
-    __ cmp(rscratch2, rscratch1, Assembler::ASR, 31);    // Top is pure sign ext
+    __ cmp(rscratch2, rscratch1, Assembler::ASR, 63);    // Top is pure sign ext
     __ br(cond == Assembler::VS ? Assembler::NE : Assembler::EQ, *L);
   %}