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Bug 885169 - Reverse the default register allocation order so that low registers like eax on x86/x64 are preferred over high registers. r=h4writer

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This commit is contained in:
Dan Gohman 2013-06-24 15:58:00 -07:00
parent 1c369ade27
commit 3a0903c8f5
1 changed files with 6 additions and 4 deletions
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10
js/src/ion/RegisterSets.h
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@ -396,10 +396,12 @@ class TypedRegisterSet
#endif
}
T getAny() const {
JS_ASSERT(!empty());
int ireg;
JS_FLOOR_LOG2(ireg, bits_);
return T::FromCode(ireg);
// The choice of first or last here is mostly arbitrary, as they are
// about the same speed on popular architectures. We choose first, as
// it has the advantage of using the "lower" registers more often. These
// registers are sometimes more efficient (e.g. optimized encodings for
// EAX on x86).
return getFirst();
}
T getFirst() const {
JS_ASSERT(!empty());