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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) if (!FunctionContainsEscapingAllocas)
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
if (CallInst *CI = dyn_cast<CallInst>(I)) { if (CallInst *CI = dyn_cast<CallInst>(I))
CI->setTailCall(); if (!CI->doesNotReturn()) {
MadeChange = true; CI->setTailCall();
} MadeChange = true;
}
return MadeChange; return MadeChange;
} }

12
test/Transforms/TailCallElim/no-return-calls.ll Normal file
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@ -0,0 +1,12 @@
; RUN: opt < %s -tailcallelim -S | FileCheck %s
define void @t() nounwind ssp {
entry:
; CHECK: entry:
; CHECK: %0 = call i32 @foo()
; CHECK: ret void
%0 = call i32 @foo() nounwind noreturn
ret void
}
declare i32 @foo()