diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index b2b94794f20..cb803f89157 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -2198,7 +2198,7 @@ X86TargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI, // Check if it's really possible to do a tail call. isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv, isVarArg, SR != NotStructReturn, - MF.getFunction()->hasStructRetAttr(), + MF.getFunction()->hasStructRetAttr(), CLI.RetTy, Outs, OutVals, Ins, DAG); // Sibcalls are automatically detected tailcalls which do not require @@ -2718,6 +2718,7 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee, bool isVarArg, bool isCalleeStructRet, bool isCallerStructRet, + Type *RetTy, const SmallVectorImpl<ISD::OutputArg> &Outs, const SmallVectorImpl<SDValue> &OutVals, const SmallVectorImpl<ISD::InputArg> &Ins, @@ -2729,6 +2730,13 @@ X86TargetLowering::IsEligibleForTailCallOptimization(SDValue Callee, // If -tailcallopt is specified, make fastcc functions tail-callable. const MachineFunction &MF = DAG.getMachineFunction(); const Function *CallerF = DAG.getMachineFunction().getFunction(); + + // If the function return type is x86_fp80 and the callee return type is not, + // then the FP_EXTEND of the call result is not a nop. It's not safe to + // perform a tailcall optimization here. + if (CallerF->getReturnType()->isX86_FP80Ty() && !RetTy->isX86_FP80Ty()) + return false; + CallingConv::ID CallerCC = CallerF->getCallingConv(); bool CCMatch = CallerCC == CalleeCC; |
