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improve support for fgetsign

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45322 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-12-22 21:26:52 +00:00
parent b16f55f3c8
commit d268a497f9
1 changed files with 6 additions and 0 deletions
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6
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -1323,6 +1323,11 @@ void SelectionDAG::ComputeMaskedBits(SDOperand Op, uint64_t Mask,
KnownZero |= (~InMask) & Mask;
return;
}
case ISD::FGETSIGN:
// All bits are zero except the low bit.
KnownZero = MVT::getIntVTBitMask(Op.getValueType()) ^ 1;
return;
case ISD::ADD: {
// If either the LHS or the RHS are Zero, the result is zero.
ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
@ -3703,6 +3708,7 @@ std::string SDNode::getOperationName(const SelectionDAG *G) const {
case ISD::FDIV: return "fdiv";
case ISD::FREM: return "frem";
case ISD::FCOPYSIGN: return "fcopysign";
case ISD::FGETSIGN: return "fgetsign";
case ISD::SETCC: return "setcc";
case ISD::SELECT: return "select";