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Bug 1031607 - IonMonkey: Constant-fold MBoundsCheck in GVN r=jandem

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This commit is contained in:
Dan Gohman 2014-06-30 09:10:24 -07:00
parent d9e98ea58a
commit 9749d5002a
2 changed files with 14 additions and 0 deletions
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13
js/src/jit/MIR.cpp
View File

@ -3065,6 +3065,19 @@ MSqrt::trySpecializeFloat32(TempAllocator &alloc) {
setPolicyType(MIRType_Float32);
}
MDefinition *
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)
return index();
}
return this;
}
bool
jit::ElementAccessIsDenseNative(MDefinition *obj, MDefinition *id)
{

1
js/src/jit/MIR.h
View File

@ -6270,6 +6270,7 @@ class MBoundsCheck
void setMaximum(int32_t n) {
maximum_ = n;
}
MDefinition *foldsTo(TempAllocator &alloc);
bool congruentTo(const MDefinition *ins) const {
if (!ins->isBoundsCheck())
return false;