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Fix a really obvious huge gaping bug, add a comment
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8620 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -50,7 +50,7 @@ bool TailCallElim::runOnFunction(Function &F) {
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// Loop over the function, looking for any returning blocks...
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for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
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if (ReturnInst *Ret = dyn_cast<ReturnInst>(BB->getTerminator()))
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if (Ret != BB->begin())
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if (Ret != BB->begin()) // Make sure there is something before the ret...
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if (CallInst *CI = dyn_cast<CallInst>(Ret->getPrev()))
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// Make sure the tail call is to the current function, and that the
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// return either returns void or returns the value computed by the
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@ -74,6 +74,7 @@ bool TailCallElim::runOnFunction(Function &F) {
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for (Function::aiterator I = F.abegin(), E = F.aend(); I!=E; ++I){
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PHINode *PN = new PHINode(I->getType(), I->getName()+".tr",
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InsertPos);
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I->replaceAllUsesWith(PN); // Everyone use the PHI node now!
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PN->addIncoming(I, NewEntry);
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ArgumentPHIs.push_back(PN);
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}
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