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8151030: PPC64: AllocatePrefetchStyle=4 is out of range

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Cleanup prefetching code and use AllocatePrefetchLines=1 by default.

Reviewed-by: goetz, mhorie, lucy
This commit is contained in:
Martin Doerr 2020-04-27 10:01:04 +02:00
parent b2db7a0c9a
commit 0e07f5a7d7
1 changed files with 4 additions and 9 deletions
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13
src/hotspot/cpu/ppc/vm_version_ppc.cpp
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@ -209,15 +209,10 @@ void VM_Version::initialize() {
if (FLAG_IS_DEFAULT(AllocatePrefetchStyle)) AllocatePrefetchStyle = 1;
if (AllocatePrefetchStyle == 4) {
AllocatePrefetchStepSize = cache_line_size; // Need exact value.
if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) AllocatePrefetchLines = 12; // Use larger blocks by default.
if (AllocatePrefetchDistance < 0) AllocatePrefetchDistance = 2*cache_line_size; // Default is not defined?
} else {
if (cache_line_size > AllocatePrefetchStepSize) AllocatePrefetchStepSize = cache_line_size;
if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) AllocatePrefetchLines = 3; // Optimistic value.
if (AllocatePrefetchDistance < 0) AllocatePrefetchDistance = 3*cache_line_size; // Default is not defined?
}
if (cache_line_size > AllocatePrefetchStepSize) AllocatePrefetchStepSize = cache_line_size;
// PPC processors have an automatic prefetch engine.
if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) AllocatePrefetchLines = 1;
if (AllocatePrefetchDistance < 0) AllocatePrefetchDistance = 3 * cache_line_size;
assert(AllocatePrefetchLines > 0, "invalid value");
if (AllocatePrefetchLines < 1) { // Set valid value in product VM.