changeset 27455:6898858b15dc

8060252: JDK-7173584 compiler changes regress SPECjvm2008 on SPARC Summary: arraycopy code misses opportunities to optimize copies to just allocated array. Reviewed-by: kvn
author roland
date Mon, 20 Oct 2014 22:53:37 +0200
parents cbd4c87b9b55
children 854b988388f3
files hotspot/src/share/vm/opto/library_call.cpp
diffstat 1 files changed, 4 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/hotspot/src/share/vm/opto/library_call.cpp	Mon Nov 03 12:02:40 2014 -0800
+++ b/hotspot/src/share/vm/opto/library_call.cpp	Mon Oct 20 22:53:37 2014 +0200
@@ -4697,6 +4697,10 @@
   Node* dest_offset = argument(3);  // type: int
   Node* length      = argument(4);  // type: int
 
+  // Check for allocation before we add nodes that would confuse
+  // tightly_coupled_allocation()
+  AllocateArrayNode* alloc = tightly_coupled_allocation(dest, NULL);
+
   // The following tests must be performed
   // (1) src and dest are arrays.
   // (2) src and dest arrays must have elements of the same BasicType
@@ -4870,7 +4874,6 @@
     return true;
   }
 
-  AllocateArrayNode* alloc = tightly_coupled_allocation(dest, NULL);
   ArrayCopyNode* ac = ArrayCopyNode::make(this, true, src, src_offset, dest, dest_offset, length, alloc != NULL,
                                           // Create LoadRange and LoadKlass nodes for use during macro expansion here
                                           // so the compiler has a chance to eliminate them: during macro expansion,