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Fix a really obvious huge gaping bug, add a comment 

llvm-svn: 8620
This commit is contained in:
Chris Lattner 2003-09-20 05:24:00 +00:00
parent 0016085602
commit b6ac976247
1 changed files with 2 additions and 1 deletions
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3
llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
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@ -50,7 +50,7 @@ bool TailCallElim::runOnFunction(Function &F) {
// Loop over the function, looking for any returning blocks...
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
if (ReturnInst *Ret = dyn_cast<ReturnInst>(BB->getTerminator()))
if (Ret != BB->begin())
if (Ret != BB->begin()) // Make sure there is something before the ret...
if (CallInst *CI = dyn_cast<CallInst>(Ret->getPrev()))
// Make sure the tail call is to the current function, and that the
// return either returns void or returns the value computed by the
@ -74,6 +74,7 @@ bool TailCallElim::runOnFunction(Function &F) {
for (Function::aiterator I = F.abegin(), E = F.aend(); I!=E; ++I){
PHINode *PN = new PHINode(I->getType(), I->getName()+".tr",
InsertPos);
I->replaceAllUsesWith(PN); // Everyone use the PHI node now!
PN->addIncoming(I, NewEntry);
ArgumentPHIs.push_back(PN);
}