Fix bug in r10812.
BUG= TEST= Review URL: https://chromiumcodereview.appspot.com/9455016 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10816 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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@ -384,9 +384,18 @@ void HValue::DeleteAndReplaceWith(HValue* other) {
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if (other != NULL) ReplaceAllUsesWith(other);
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ASSERT(HasNoUses());
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// Clearing the operands includes going through the use list of each operand
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// to remove this HValue, which can be expensive. Instead, we simply mark it
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// as dead and remove it lazily from the operands' use lists.
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// to remove this HValue, which can be expensive. Instead, we mark this as
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// dead and only check the first item in the use list of each operand.
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// For the following items in the use lists we rely on the tail() method to
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// skip dead dead items and remove them lazily.
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SetFlag(kIsDead);
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for (int i = 0; i < OperandCount(); ++i) {
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HValue* operand = OperandAt(i);
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HUseListNode* first = operand->use_list_;
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if (first != NULL && first->index() == i && first->value() == this) {
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operand->use_list_ = first->tail();
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}
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}
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DeleteFromGraph();
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}
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