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Factor code out into the Utils library
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10530 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1906,29 +1906,9 @@ bool InstCombiner::transformConstExprCastCall(CallSite CS) {
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// PHINode simplification
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//
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Instruction *InstCombiner::visitPHINode(PHINode &PN) {
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// If the PHI node only has one incoming value, eliminate the PHI node...
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if (PN.getNumIncomingValues() == 1)
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return ReplaceInstUsesWith(PN, PN.getIncomingValue(0));
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// Otherwise if all of the incoming values are the same for the PHI, replace
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// the PHI node with the incoming value.
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//
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Value *InVal = 0;
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for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i)
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if (PN.getIncomingValue(i) != &PN) // Not the PHI node itself...
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if (InVal && PN.getIncomingValue(i) != InVal)
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return 0; // Not the same, bail out.
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else
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InVal = PN.getIncomingValue(i);
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// The only case that could cause InVal to be null is if we have a PHI node
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// that only has entries for itself. In this case, there is no entry into the
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// loop, so kill the PHI.
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//
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if (InVal == 0) InVal = Constant::getNullValue(PN.getType());
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// All of the incoming values are the same, replace the PHI node now.
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return ReplaceInstUsesWith(PN, InVal);
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if (Value *V = hasConstantValue(&PN))
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return ReplaceInstUsesWith(PN, V);
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return 0;
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}
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