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Do not sibcall if stack needs to be dynamically aligned.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99620 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-03-26 16:26:03 +00:00
parent 3c262eec53
commit 2c12cb47d9
2 changed files with 17 additions and 0 deletions
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6
lib/Target/X86/X86ISelLowering.cpp
View File

@ -2290,6 +2290,7 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
return false;
// If -tailcallopt is specified, make fastcc functions tail-callable.
const MachineFunction &MF = DAG.getMachineFunction();
const Function *CallerF = DAG.getMachineFunction().getFunction();
if (GuaranteedTailCallOpt) {
if (IsTailCallConvention(CalleeCC) &&
@ -2301,6 +2302,11 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
// Look for obvious safe cases to perform tail call optimization that does not
// requite ABI changes. This is what gcc calls sibcall.
// Can't do sibcall if stack needs to be dynamically re-aligned. PEI needs to
// emit a special epilogue.
if (RegInfo->needsStackRealignment(MF))
return false;
// Do not sibcall optimize vararg calls unless the call site is not passing any
// arguments.
if (isVarArg && !Outs.empty())

11
test/CodeGen/X86/sibcall.ll
View File

@ -302,3 +302,14 @@ entry:
}
declare double @bar6(...)
define void @t19() alignstack(32) nounwind {
entry:
; CHECK: t19:
; CHECK: andl $-32
; CHECK: call {{_?}}foo
tail call void @foo() nounwind
ret void
}
declare void @foo()