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Address Evan's comments for r151877.

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Specifically, remove the magic number when checking to see if the copy has a 
glue operand and simplify the checking logic.

rdar://10930395


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152041 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2012-03-05 19:27:12 +00:00
parent af71f16f93
commit c8d7eea264
1 changed files with 6 additions and 7 deletions
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13
lib/Target/X86/X86ISelLowering.cpp
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@ -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;