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reduce nesting.

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llvm-svn: 99358
This commit is contained in:
Chris Lattner 2010-03-24 00:12:57 +00:00
parent 01e2cd0da3
commit f468453934
1 changed files with 8 additions and 9 deletions
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17
lib/Target/X86/X86InstrInfo.td
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@ -473,15 +473,14 @@ def trunc_su : PatFrag<(ops node:$src), (trunc node:$src), [{
def or_is_add : PatFrag<(ops node:$lhs, node:$rhs), (or node:$lhs, node:$rhs),[{
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N->getOperand(1)))
return CurDAG->MaskedValueIsZero(N->getOperand(0), CN->getAPIntValue());
else {
unsigned BitWidth = N->getValueType(0).getScalarType().getSizeInBits();
APInt Mask = APInt::getAllOnesValue(BitWidth);
APInt KnownZero0, KnownOne0;
CurDAG->ComputeMaskedBits(N->getOperand(0), Mask, KnownZero0, KnownOne0, 0);
APInt KnownZero1, KnownOne1;
CurDAG->ComputeMaskedBits(N->getOperand(1), Mask, KnownZero1, KnownOne1, 0);
return (~KnownZero0 & ~KnownZero1) == 0;
}
unsigned BitWidth = N->getValueType(0).getScalarType().getSizeInBits();
APInt Mask = APInt::getAllOnesValue(BitWidth);
APInt KnownZero0, KnownOne0;
CurDAG->ComputeMaskedBits(N->getOperand(0), Mask, KnownZero0, KnownOne0, 0);
APInt KnownZero1, KnownOne1;
CurDAG->ComputeMaskedBits(N->getOperand(1), Mask, KnownZero1, KnownOne1, 0);
return (~KnownZero0 & ~KnownZero1) == 0;
}]>;
// 'shld' and 'shrd' instruction patterns. Note that even though these have