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There can be more than one PHINode at the start of the block. 

llvm-svn: 31362
This commit is contained in:
Devang Patel 2006-11-01 23:04:45 +00:00
parent 3557a39494
commit 2cb4f83b38
1 changed files with 4 additions and 5 deletions
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9
llvm/lib/Transforms/Scalar/CondPropagate.cpp
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@ -196,11 +196,10 @@ void CondProp::RevectorBlockTo(BasicBlock *FromBB, BasicBlock *ToBB) {
// Get the old block we are threading through. // Get the old block we are threading through.
BasicBlock *OldSucc = FromBr->getSuccessor(0); BasicBlock *OldSucc = FromBr->getSuccessor(0);
// OldSucc had multiple successors. If ToBB has multiple predecessors, the // OldSucc had multiple successors. If ToBB has multiple predecessors, then
// edge between them would be critical, which we already took care of. // the edge between them would be critical, which we already took care of.
// If ToBB has single operand PHI node than take care of it here. // If ToBB has single operand PHI node then take care of it here.
if (isa<PHINode>(ToBB->begin())) { while (PHINode *PN = dyn_cast<PHINode>(ToBB->begin())) {
PHINode *PN = cast<PHINode>(ToBB->begin());
assert(PN->getNumIncomingValues() == 1 && "Critical Edge Found!"); assert(PN->getNumIncomingValues() == 1 && "Critical Edge Found!");
PN->replaceAllUsesWith(PN->getIncomingValue(0)); PN->replaceAllUsesWith(PN->getIncomingValue(0));
PN->eraseFromParent(); PN->eraseFromParent();