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HChange is only deletable under certain circumstances.

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R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/11092075

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12702 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
svenpanne@chromium.org 2012-10-11 14:14:03 +00:00
parent 348736efaa
commit 86bcbcdc0b
1 changed files with 6 additions and 4 deletions
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10
src/hydrogen-instructions.h
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@ -1194,7 +1194,7 @@ class HUnaryOperation: public HTemplateInstruction<1> {
return reinterpret_cast<HUnaryOperation*>(value);
}
HValue* value() { return OperandAt(0); }
HValue* value() const { return OperandAt(0); }
virtual void PrintDataTo(StringStream* stream);
};
@ -1270,8 +1270,8 @@ class HChange: public HUnaryOperation {
virtual HType CalculateInferredType();
virtual HValue* Canonicalize();
Representation from() { return value()->representation(); }
Representation to() { return representation(); }
Representation from() const { return value()->representation(); }
Representation to() const { return representation(); }
bool deoptimize_on_undefined() const {
return CheckFlag(kDeoptimizeOnUndefined);
}
@ -1292,7 +1292,9 @@ class HChange: public HUnaryOperation {
virtual bool DataEquals(HValue* other) { return true; }
private:
virtual bool IsDeletable() const { return true; }
virtual bool IsDeletable() const {
return !from().IsTagged() || value()->type().IsSmi();
}
};