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.
llvm-svn: 94937
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@ -184,10 +184,11 @@ bool TailCallElim::runOnFunction(Function &F) {
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if (!FunctionContainsEscapingAllocas)
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for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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if (CallInst *CI = dyn_cast<CallInst>(I)) {
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CI->setTailCall();
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MadeChange = true;
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}
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if (CallInst *CI = dyn_cast<CallInst>(I))
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if (!CI->doesNotReturn()) {
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CI->setTailCall();
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MadeChange = true;
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}
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return MadeChange;
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}
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@ -0,0 +1,12 @@
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; RUN: opt < %s -tailcallelim -S | FileCheck %s
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define void @t() nounwind ssp {
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entry:
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; CHECK: entry:
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; CHECK: %0 = call i32 @foo()
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; CHECK: ret void
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%0 = call i32 @foo() nounwind noreturn
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ret void
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}
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declare i32 @foo()
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