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Speculatively revert r108429 to fix the clang self-host.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108436 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson
2010-07-15 18:18:57 +00:00
parent 40bf5e7a68
commit 11acba0470
2 changed files with 28 additions and 19 deletions
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lib/Transforms/InstCombine/InstCombineSelect.cpp
+28
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@@ -699,6 +699,34 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
SI.setOperand(2, TrueVal);
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;
}