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6940726: Use BIS instruction for allocation prefetch on Sparc

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Use BIS instruction for allocation prefetch on Sparc

Reviewed-by: twisti
This commit is contained in:
Vladimir Kozlov 2010-04-07 12:39:27 -07:00
parent 629d139cac
commit f6934fd3b7
6 changed files with 93 additions and 7 deletions
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16
hotspot/src/cpu/sparc/vm/vm_version_sparc.cpp
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@ -86,9 +86,19 @@ void VM_Version::initialize() {
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)) {