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Implement xor.ll:test21: select (not C), A, B -> select C, B, A

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21495 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-04-24 07:30:14 +00:00
parent 6edb7e8c20
commit a1df33c0ee
1 changed files with 10 additions and 2 deletions
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12
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -311,7 +311,7 @@ bool InstCombiner::SimplifyCommutative(BinaryOperator &I) {
// //
static inline Value *dyn_castNegVal(Value *V) { static inline Value *dyn_castNegVal(Value *V) {
if (BinaryOperator::isNeg(V)) if (BinaryOperator::isNeg(V))
return BinaryOperator::getNegArgument(cast<BinaryOperator>(V)); return BinaryOperator::getNegArgument(V);
// Constants can be considered to be negated values if they can be folded. // Constants can be considered to be negated values if they can be folded.
if (ConstantInt *C = dyn_cast<ConstantInt>(V)) if (ConstantInt *C = dyn_cast<ConstantInt>(V))
@ -321,7 +321,7 @@ static inline Value *dyn_castNegVal(Value *V) {
static inline Value *dyn_castNotVal(Value *V) { static inline Value *dyn_castNotVal(Value *V) {
if (BinaryOperator::isNot(V)) if (BinaryOperator::isNot(V))
return BinaryOperator::getNotArgument(cast<BinaryOperator>(V)); return BinaryOperator::getNotArgument(V);
// Constants can be considered to be not'ed values... // Constants can be considered to be not'ed values...
if (ConstantIntegral *C = dyn_cast<ConstantIntegral>(V)) if (ConstantIntegral *C = dyn_cast<ConstantIntegral>(V))
@ -3885,6 +3885,14 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
} }
} }
} }
if (BinaryOperator::isNot(CondVal)) {
SI.setOperand(0, BinaryOperator::getNotArgument(CondVal));
SI.setOperand(1, FalseVal);
SI.setOperand(2, TrueVal);
return &SI;
}
return 0; return 0;
} }