diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index d4aaa7a9ee6..38f82c04296 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -3467,8 +3467,8 @@ SDValue X86TargetLowering::LowerFormalArguments( FuncInfo->getForwardedMustTailRegParms(); CCInfo.analyzeMustTailForwardedRegisters(Forwards, RegParmTypes, CC_X86); - // Conservatively forward AL on x86_64, since it might be used for varargs. - if (Is64Bit && !CCInfo.isAllocated(X86::AL)) { + // Forward AL for SysV x86_64 targets, since it is used for varargs. + if (Is64Bit && !IsWin64 && !CCInfo.isAllocated(X86::AL)) { unsigned ALVReg = MF.addLiveIn(X86::AL, &X86::GR8RegClass); Forwards.push_back(ForwardedRegister(ALVReg, X86::AL, MVT::i8)); } |
