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Fold (X > -1) | (Y > -1) --> (X&Y > -1)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21552 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-04-26 01:18:33 +00:00
parent 855adb1ac4
commit d36f979085
1 changed files with 3 additions and 1 deletions
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4
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -1075,8 +1075,10 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
if (cast<ConstantSDNode>(LR)->isAllOnesValue()) {
// (X == -1) & (Y == -1) -> (X&Y == -1)
// (X != -1) | (Y != -1) -> (X&Y != -1)
// (X > -1) | (Y > -1) -> (X&Y > -1)
if ((Opcode == ISD::AND && Op2 == ISD::SETEQ) ||
(Opcode == ISD::OR && Op2 == ISD::SETNE))
(Opcode == ISD::OR && Op2 == ISD::SETNE) ||
(Opcode == ISD::OR && Op2 == ISD::SETGT))
return getSetCC(Op2, VT,
getNode(ISD::AND, LR.getValueType(), LL, RL), LR);
// (X > -1) & (Y > -1) -> (X|Y > -1)