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Bug 1039667 - IonMonkey: Clear the Guard flag when folding away MBoundsCheck instructions r=jandem

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This commit is contained in:
Dan Gohman 2014-07-17 11:56:38 -07:00
parent cd119e9fd0
commit 2d63854c6a
1 changed files with 5 additions and 1 deletions
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6
js/src/jit/MIR.cpp
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@ -3225,8 +3225,12 @@ MBoundsCheck::foldsTo(TempAllocator &alloc)
if (index()->isConstant() && length()->isConstant()) {
uint32_t len = length()->toConstant()->value().toInt32();
uint32_t idx = index()->toConstant()->value().toInt32();
if (idx + uint32_t(minimum()) < len && idx + uint32_t(maximum()) < len)
if (idx + uint32_t(minimum()) < len && idx + uint32_t(maximum()) < len) {
// This bounds check will never fail, so we can clear the Guard flag
// and allow it to be deleted.
setNotGuard();
return index();
}
}
return this;