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It is not possible to determie dominance between two PHI nodes
based on their ordering. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35369 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -19,6 +19,7 @@
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#include "llvm/Assembly/Writer.h"
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#include "llvm/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/SetOperations.h"
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#include "llvm/Instructions.h"
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#include <algorithm>
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using namespace llvm;
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@ -265,6 +266,11 @@ bool DominatorSetBase::dominates(Instruction *A, Instruction *B) const {
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BasicBlock *BBA = A->getParent(), *BBB = B->getParent();
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if (BBA != BBB) return dominates(BBA, BBB);
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// It is not possible to determie dominance between two PHI nodes
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// based on their ordering.
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if (isa<PHINode>(A) && isa<PHINode>(B))
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return false;
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// Loop through the basic block until we find A or B.
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BasicBlock::iterator I = BBA->begin();
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for (; &*I != A && &*I != B; ++I) /*empty*/;
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