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don't insert an and node if it isn't needed here, this can prevent folding 

of lowered target nodes.

llvm-svn: 25804
This commit is contained in:
Chris Lattner 2006-01-30 04:22:28 +00:00
parent f0b24d2dc0
commit d6f5ae4455
1 changed files with 3 additions and 1 deletions
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4
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -1284,7 +1284,9 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
} else { } else {
// Make sure the condition is either zero or one. It may have been // Make sure the condition is either zero or one. It may have been
// promoted from something else. // promoted from something else.
Tmp1 = DAG.getZeroExtendInReg(Tmp1, MVT::i1); unsigned NumBits = MVT::getSizeInBits(Tmp1.getValueType());
if (!TLI.MaskedValueIsZero(Tmp1, (~0ULL >> (64-NumBits))^1))
Tmp1 = DAG.getZeroExtendInReg(Tmp1, MVT::i1);
Result = DAG.getSelectCC(Tmp1, Result = DAG.getSelectCC(Tmp1,
DAG.getConstant(0, Tmp1.getValueType()), DAG.getConstant(0, Tmp1.getValueType()),
Tmp2, Tmp3, ISD::SETNE); Tmp2, Tmp3, ISD::SETNE);