diff options
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 8320fc1b882..1a15bea0d92 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -3092,9 +3092,13 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee, if (isCalleeStructRet || isCallerStructRet) return false; - // An stdcall caller is expected to clean up its arguments; the callee - // isn't going to do that. - if (!CCMatch && CallerCC == CallingConv::X86_StdCall) + // An stdcall/thiscall caller is expected to clean up its arguments; the + // callee isn't going to do that. + // FIXME: this is more restrictive than needed. We could produce a tailcall + // when the stack adjustment matches. For example, with a thiscall that takes + // only one argument. + if (!CCMatch && (CallerCC == CallingConv::X86_StdCall || + CallerCC == CallingConv::X86_ThisCall)) return false; // Do not sibcall optimize vararg calls unless all arguments are passed via |
