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Do not mark no-return calls tail calls. It'll screw up special calls like longjmp and it doesn't make much sense for performance reason. If my logic is faulty, please let me know.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94937 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-01-31 00:59:31 +00:00
parent 3ed6f876c8
commit 56a5886b20
2 changed files with 17 additions and 4 deletions
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9
lib/Transforms/Scalar/TailRecursionElimination.cpp
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@@ -184,10 +184,11 @@ bool TailCallElim::runOnFunction(Function &F) {
if (!FunctionContainsEscapingAllocas)
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
if (CallInst *CI = dyn_cast<CallInst>(I)) {
CI->setTailCall();
MadeChange = true;
}
if (CallInst *CI = dyn_cast<CallInst>(I))
if (!CI->doesNotReturn()) {
CI->setTailCall();
MadeChange = true;
}
return MadeChange;
}