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Handle PHINode with only one incoming value.

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This fixes http://llvm.org/bugs/show_bug.cgi?id=979


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31358 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2006-11-01 22:26:43 +00:00
parent dba4aeaef1
commit 2c0565f8e0
1 changed files with 9 additions and 5 deletions
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14
lib/Transforms/Scalar/CondPropagate.cpp
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@ -196,11 +196,15 @@ void CondProp::RevectorBlockTo(BasicBlock *FromBB, BasicBlock *ToBB) {
// Get the old block we are threading through.
BasicBlock *OldSucc = FromBr->getSuccessor(0);
// ToBB should not have any PHI nodes in it to update, because OldSucc had
// multiple successors. If OldSucc had multiple successor and ToBB had
// multiple predecessors, the edge between them would be critical, which we
// already took care of.
assert(!isa<PHINode>(ToBB->begin()) && "Critical Edge Found!");
// OldSucc had multiple successors. If ToBB has multiple predecessors, 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 (isa<PHINode>(ToBB->begin())) {
PHINode *PN = cast<PHINode>(ToBB->begin());
assert(PN->getNumIncomingValues() == 1 && "Critical Edge Found!");
PN->replaceAllUsesWith(PN->getIncomingValue(0));
PN->eraseFromParent();
}
// Update PHI nodes in OldSucc to know that FromBB no longer branches to it.
OldSucc->removePredecessor(FromBB);