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delete some obviously dead vector operations, which deletes a few thousand
operations from Duraids example. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37582 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -3245,8 +3245,10 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
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return &I;
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} else {
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if (ConstantVector *CP = dyn_cast<ConstantVector>(Op1)) {
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if (CP->isAllOnesValue())
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if (CP->isAllOnesValue()) // X & <-1,-1> -> X
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return ReplaceInstUsesWith(I, I.getOperand(0));
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} else if (isa<ConstantAggregateZero>(Op1)) {
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return ReplaceInstUsesWith(I, Op1); // X & <0,0> -> <0,0>
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}
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}
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@ -3714,7 +3716,14 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) {
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if (SimplifyDemandedBits(&I, APInt::getAllOnesValue(BitWidth),
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KnownZero, KnownOne))
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return &I;
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} else if (isa<ConstantAggregateZero>(Op1)) {
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return ReplaceInstUsesWith(I, Op0); // X | <0,0> -> X
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} else if (ConstantVector *CP = dyn_cast<ConstantVector>(Op1)) {
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if (CP->isAllOnesValue()) // X | <-1,-1> -> <-1,-1>
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return ReplaceInstUsesWith(I, I.getOperand(1));
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}
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// or X, -1 == -1
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if (ConstantInt *RHS = dyn_cast<ConstantInt>(Op1)) {
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@ -4107,6 +4116,8 @@ Instruction *InstCombiner::visitXor(BinaryOperator &I) {
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if (SimplifyDemandedBits(&I, APInt::getAllOnesValue(BitWidth),
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KnownZero, KnownOne))
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return &I;
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} else if (isa<ConstantAggregateZero>(Op1)) {
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return ReplaceInstUsesWith(I, Op0); // X ^ <0,0> -> X
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}
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if (ConstantInt *RHS = dyn_cast<ConstantInt>(Op1)) {
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