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Fix a bug that occurs when the constant value is the result of an invoke. In

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particular, invoke ret values are only live in the normal dest of the invoke
not in the unwind dest.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17108 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-18 01:21:17 +00:00
parent 963869e41a
commit 28e792c232
1 changed files with 6 additions and 5 deletions
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11
lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -95,10 +95,12 @@ namespace {
void run();
/// dominates - Return true if BB1 dominates BB2 using the DT.
/// dominates - Return true if I1 dominates I2 using the DominatorTree.
///
bool dominates(BasicBlock *BB1, BasicBlock *BB2) const {
return DT[BB1]->dominates(DT[BB2]);
bool dominates(Instruction *I1, Instruction *I2) const {
if (InvokeInst *II = dyn_cast<InvokeInst>(I1))
I1 = II->getNormalDest()->begin();
return DT[I1->getParent()]->dominates(DT[I2->getParent()]);
}
private:
@ -339,8 +341,7 @@ void PromoteMem2Reg::run() {
for (unsigned i = 0, e = PNs.size(); i != e; ++i)
if (PNs[i]) {
if (Value *V = hasConstantValue(PNs[i])) {
if (!isa<Instruction>(V) ||
dominates(cast<Instruction>(V)->getParent(), I->first)) {
if (!isa<Instruction>(V) || dominates(cast<Instruction>(V), PNs[i])) {
PNs[i]->replaceAllUsesWith(V);
PNs[i]->eraseFromParent();
PNs[i] = 0;