forked from OSchip/llvm-project
Remove the rest of my instcombine changes. Back to the drawing board on this one.
llvm-svn: 108530
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0e5fb020a0
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@ -700,33 +700,5 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
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return &SI;
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}
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// select (A == 0 | B == 0), T, F--> select (A != 0 & B != 0), F, T
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// Note: This is a canonicalization rather than an optimization, and is used
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// to expose opportunities to other instcombine transforms.
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Instruction* CondInst = dyn_cast<Instruction>(CondVal);
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if (CondInst && CondInst->hasOneUse() &&
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CondInst->getOpcode() == Instruction::Or) {
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ICmpInst *LHSCmp = dyn_cast<ICmpInst>(CondInst->getOperand(0));
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ICmpInst *RHSCmp = dyn_cast<ICmpInst>(CondInst->getOperand(1));
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if (LHSCmp && LHSCmp->hasOneUse() &&
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LHSCmp->getPredicate() == ICmpInst::ICMP_EQ &&
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RHSCmp && RHSCmp->hasOneUse() &&
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RHSCmp->getPredicate() == ICmpInst::ICMP_EQ) {
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ConstantInt* C1 = dyn_cast<ConstantInt>(LHSCmp->getOperand(1));
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ConstantInt* C2 = dyn_cast<ConstantInt>(RHSCmp->getOperand(1));
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if (C1 && C1->isZero() && C2 && C2->isZero()) {
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LHSCmp->setPredicate(ICmpInst::ICMP_NE);
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RHSCmp->setPredicate(ICmpInst::ICMP_NE);
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Value *And =
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InsertNewInstBefore(BinaryOperator::CreateAnd(LHSCmp, RHSCmp,
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"and."+CondVal->getName()), SI);
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SI.setOperand(0, And);
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SI.setOperand(1, FalseVal);
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SI.setOperand(2, TrueVal);
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return &SI;
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}
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}
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}
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return 0;
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}
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