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diff src/cpu/sparc/vm/vm_version_sparc.cpp @ 1367:9e321dcfa5b7

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6940726: Use BIS instruction for allocation prefetch on Sparc Summary: Use BIS instruction for allocation prefetch on Sparc Reviewed-by: twisti
author kvn
date Wed, 07 Apr 2010 12:39:27 -0700
parents 6476042f815c
children 3bfae429e2cf
line wrap: on
line diff
--- a/src/cpu/sparc/vm/vm_version_sparc.cpp	Wed Apr 07 10:35:56 2010 -0700
+++ b/src/cpu/sparc/vm/vm_version_sparc.cpp	Wed Apr 07 12:39:27 2010 -0700
@@ -86,9 +86,19 @@
     if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
       FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
     }
-    if (is_niagara1_plus() && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
-      // Use smaller prefetch distance on N2
-      FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
+    if (is_niagara1_plus()) {
+      if (AllocatePrefetchStyle > 0 && FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
+        // Use BIS instruction for allocation prefetch.
+        FLAG_SET_DEFAULT(AllocatePrefetchStyle, 3);
+        if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
+          // Use smaller prefetch distance on N2 with BIS
+          FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64);
+        }
+      }
+      if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
+        // Use different prefetch distance without BIS
+        FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
+      }
     }
 #endif
     if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {