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Bug 779818 - Substitute MPhi of Magic type by the lazy argument constant. r=dvander

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This commit is contained in:
Nicolas B. Pierron 2012-08-06 17:23:39 -07:00
parent 6682b07503
commit 0c918a1289
1 changed files with 16 additions and 2 deletions
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18
js/src/ion/IonAnalysis.cpp
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@ -394,7 +394,21 @@ void
TypeAnalyzer::replaceRedundantPhi(MPhi *phi)
{
MBasicBlock *block = phi->block();
js::Value v = (phi->type() == MIRType_Undefined) ? UndefinedValue() : NullValue();
js::Value v;
switch (phi->type()) {
case MIRType_Undefined:
v = UndefinedValue();
break;
case MIRType_Null:
v = NullValue();
break;
case MIRType_Magic:
v = MagicValue(JS_OPTIMIZED_ARGUMENTS);
break;
default:
JS_NOT_REACHED("unexpected type");
return;
}
MConstant *c = MConstant::New(v);
// The instruction pass will insert the box
block->insertBefore(*(block->begin()), c);
@ -409,7 +423,7 @@ TypeAnalyzer::insertConversions()
// inputs of uses) does not conflict with input adjustment.
for (ReversePostorderIterator block(graph.rpoBegin()); block != graph.rpoEnd(); block++) {
for (MPhiIterator phi(block->phisBegin()); phi != block->phisEnd();) {
if (phi->type() <= MIRType_Null) {
if (phi->type() <= MIRType_Null || phi->type() == MIRType_Magic) {
replaceRedundantPhi(*phi);
phi = block->discardPhiAt(phi);
} else {