diff options
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index d1ded33384..cae9aadfca 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -1585,13 +1585,12 @@ bool X86TargetLowering::isUsedByReturnOnly(SDNode *N) const { return false; SDNode *Copy = *N->use_begin(); - if (Copy->getOpcode() != ISD::CopyToReg && - Copy->getOpcode() != ISD::FP_EXTEND) - return false; - - // If anything is glued to the copy, then we can't safely perform a tail call. - if (Copy->getOpcode() == ISD::CopyToReg && - Copy->getNumOperands() == 4) + if (Copy->getOpcode() == ISD::CopyToReg) { + // If the copy has a glue operand, we conservatively assume it isn't safe to + // perform a tail call. + if (Copy->getOperand(Copy->getNumOperands()-1).getValueType() == MVT::Glue) + return false; + } else if (Copy->getOpcode() != ISD::FP_EXTEND) return false; bool HasRet = false; |