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7081933: Use zeroing elimination optimization for large array

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Don't zero new typeArray during runtime call if the allocation is followed by arraycopy into it.

Reviewed-by: twisti
This commit is contained in:
Vladimir Kozlov 2011-09-26 10:24:05 -07:00
parent 95c56a472b
commit 47e357e16f
13 changed files with 97 additions and 11 deletions
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4
hotspot/src/cpu/sparc/vm/stubGenerator_sparc.cpp
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@ -2359,10 +2359,10 @@ class StubGenerator: public StubCodeGenerator {
for (int off = 0; off < 64; off += 16) {
if (use_prefetch && (off & 31) == 0) {
if (ArraycopySrcPrefetchDistance > 0) {
__ prefetch(from, ArraycopySrcPrefetchDistance, Assembler::severalReads);
__ prefetch(from, ArraycopySrcPrefetchDistance+off, Assembler::severalReads);
}
if (ArraycopyDstPrefetchDistance > 0) {
__ prefetch(to, ArraycopyDstPrefetchDistance, Assembler::severalWritesAndPossiblyReads);
__ prefetch(to, ArraycopyDstPrefetchDistance+off, Assembler::severalWritesAndPossiblyReads);
}
}
__ ldx(from, off+0, O4);