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6954029: Improve implicit null check generation with compressed oops

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Hoist DecodeN instruction above null check

Reviewed-by: never, twisti
This commit is contained in:
Vladimir Kozlov 2010-06-02 09:49:32 -07:00
parent be95b163a6
commit a3005a16fc
9 changed files with 119 additions and 21 deletions
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7
hotspot/src/cpu/sparc/vm/vm_version_sparc.cpp
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@ -65,13 +65,6 @@ void VM_Version::initialize() {
FLAG_SET_DEFAULT(UseInlineCaches, false);
}
#ifdef _LP64
// Single issue niagara1 is slower for CompressedOops
// but niagaras after that it's fine.
if (!is_niagara1_plus()) {
if (FLAG_IS_DEFAULT(UseCompressedOops)) {
FLAG_SET_ERGO(bool, UseCompressedOops, false);
}
}
// 32-bit oops don't make sense for the 64-bit VM on sparc
// since the 32-bit VM has the same registers and smaller objects.
Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);