diff options
Diffstat (limited to 'lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 75e6f50548..d08dfc4eab 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -2301,8 +2301,9 @@ 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. - // Do not sibcall optimize vararg calls for now. - if (isVarArg) + // Do not sibcall optimize vararg calls unless the call site is not passing any + // arguments. + if (isVarArg && !Outs.empty()) return false; // Also avoid sibcall optimization if either caller or callee uses struct |