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diff src/cpu/sparc/vm/vm_version_sparc.cpp @ 675:f6da6f0174ac

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6821700: tune VM flags for peak performance Summary: Tune C2 flags default values for performance. Reviewed-by: never, phh, iveresov, jmasa, ysr
author kvn
date Mon, 30 Mar 2009 18:19:31 -0700
parents c771b7f43bbf
children 6476042f815c
line wrap: on
line diff
--- a/src/cpu/sparc/vm/vm_version_sparc.cpp	Fri Mar 27 14:37:42 2009 -0700
+++ b/src/cpu/sparc/vm/vm_version_sparc.cpp	Mon Mar 30 18:19:31 2009 -0700
@@ -62,7 +62,7 @@
   if (is_niagara1()) {
     // Indirect branch is the same cost as direct
     if (FLAG_IS_DEFAULT(UseInlineCaches)) {
-      UseInlineCaches         = false;
+      FLAG_SET_DEFAULT(UseInlineCaches, false);
     }
 #ifdef _LP64
     // Single issue niagara1 is slower for CompressedOops
@@ -79,15 +79,19 @@
 #ifdef COMPILER2
     // Indirect branch is the same cost as direct
     if (FLAG_IS_DEFAULT(UseJumpTables)) {
-      UseJumpTables           = true;
+      FLAG_SET_DEFAULT(UseJumpTables, true);
     }
     // Single-issue, so entry and loop tops are
     // aligned on a single instruction boundary
     if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
-      InteriorEntryAlignment  = 4;
+      FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
     }
     if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
-      OptoLoopAlignment       = 4;
+      FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
+    }
+    if (is_niagara1_plus() && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
+      // Use smaller prefetch distance on N2
+      FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
     }
 #endif
   }
@@ -95,7 +99,7 @@
   // Use hardware population count instruction if available.
   if (has_hardware_popc()) {
     if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
-      UsePopCountInstruction = true;
+      FLAG_SET_DEFAULT(UsePopCountInstruction, true);
     }
   }