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Remove the rest of my instcombine changes. Back to the drawing board on this one.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108530 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2010-07-16 16:39:00 +00:00
parent e928ec9480
commit 835d425a16
1 changed files with 0 additions and 28 deletions
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28
lib/Transforms/InstCombine/InstCombineSelect.cpp
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@ -700,33 +700,5 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
return &SI;
}
// select (A == 0 | B == 0), T, F--> select (A != 0 & B != 0), F, T
// Note: This is a canonicalization rather than an optimization, and is used
// to expose opportunities to other instcombine transforms.
Instruction* CondInst = dyn_cast<Instruction>(CondVal);
if (CondInst && CondInst->hasOneUse() &&
CondInst->getOpcode() == Instruction::Or) {
ICmpInst *LHSCmp = dyn_cast<ICmpInst>(CondInst->getOperand(0));
ICmpInst *RHSCmp = dyn_cast<ICmpInst>(CondInst->getOperand(1));
if (LHSCmp && LHSCmp->hasOneUse() &&
LHSCmp->getPredicate() == ICmpInst::ICMP_EQ &&
RHSCmp && RHSCmp->hasOneUse() &&
RHSCmp->getPredicate() == ICmpInst::ICMP_EQ) {
ConstantInt* C1 = dyn_cast<ConstantInt>(LHSCmp->getOperand(1));
ConstantInt* C2 = dyn_cast<ConstantInt>(RHSCmp->getOperand(1));
if (C1 && C1->isZero() && C2 && C2->isZero()) {
LHSCmp->setPredicate(ICmpInst::ICMP_NE);
RHSCmp->setPredicate(ICmpInst::ICMP_NE);
Value *And =
InsertNewInstBefore(BinaryOperator::CreateAnd(LHSCmp, RHSCmp,
"and."+CondVal->getName()), SI);
SI.setOperand(0, And);
SI.setOperand(1, FalseVal);
SI.setOperand(2, TrueVal);
return &SI;
}
}
}
return 0;
}