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PHINode::hasConstantValue should never return the PHI itself, even if the

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PHI is its only operand.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22676 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-08-05 15:37:31 +00:00
parent 80f4d88a97
commit d7231ac523
1 changed files with 5 additions and 2 deletions
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7
lib/VMCore/Instructions.cpp
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@ -138,8 +138,11 @@ void PHINode::resizeOperands(unsigned NumOps) {
Value *PHINode::hasConstantValue(bool AllowNonDominatingInstruction) const {
// If the PHI node only has one incoming value, eliminate the PHI node...
if (getNumIncomingValues() == 1)
return getIncomingValue(0);
if (getIncomingValue(0) != this) // not X = phi X
return getIncomingValue(0);
else
return UndefValue::get(getType()); // Self cycle is dead.
// Otherwise if all of the incoming values are the same for the PHI, replace
// the PHI node with the incoming value.
//