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Change PHINode::hasConstantValue to have a DominatorTree argument

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instead of a bool argument, and to do the dominator check itself.
This makes it eaiser to use when DominatorTree information is
available.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80920 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-09-03 15:34:35 +00:00
parent dd12de686c
commit bccfc24c4e
7 changed files with 49 additions and 37 deletions
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11
lib/Transforms/Utils/BasicBlockUtils.cpp
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@@ -429,13 +429,10 @@ BasicBlock *llvm::SplitBlockPredecessors(BasicBlock *BB,
PN->addIncoming(InVal, NewBB);
// Check to see if we can eliminate this phi node.
if (Value *V = PN->hasConstantValue(DT != 0)) {
Instruction *I = dyn_cast<Instruction>(V);
if (!I || DT == 0 || DT->dominates(I, PN)) {
PN->replaceAllUsesWith(V);
if (AA) AA->deleteValue(PN);
PN->eraseFromParent();
}
if (Value *V = PN->hasConstantValue(DT)) {
PN->replaceAllUsesWith(V);
if (AA) AA->deleteValue(PN);
PN->eraseFromParent();
}
}