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Fix InstCombine/2007-01-18-VectorInfLoop.ll, a case where instcombine

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infinitely loops.

llvm-svn: 33343
This commit is contained in:
Chris Lattner 2007-01-18 22:16:33 +00:00
parent f457b999c7
commit ef4715a124
1 changed files with 9 additions and 3 deletions
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12
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3062,10 +3062,16 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
// See if we can simplify any instructions used by the instruction whose sole // See if we can simplify any instructions used by the instruction whose sole
// purpose is to compute bits we don't care about. // purpose is to compute bits we don't care about.
uint64_t KnownZero, KnownOne; uint64_t KnownZero, KnownOne;
if (!isa<PackedType>(I.getType()) && if (!isa<PackedType>(I.getType())) {
SimplifyDemandedBits(&I, I.getType()->getIntegerTypeMask(), if (SimplifyDemandedBits(&I, I.getType()->getIntegerTypeMask(),
KnownZero, KnownOne)) KnownZero, KnownOne))
return &I; return &I;
} else {
if (ConstantPacked *CP = dyn_cast<ConstantPacked>(Op1)) {
if (CP->isAllOnesValue())
return ReplaceInstUsesWith(I, I.getOperand(0));
}
}
if (ConstantInt *AndRHS = dyn_cast<ConstantInt>(Op1)) { if (ConstantInt *AndRHS = dyn_cast<ConstantInt>(Op1)) {
uint64_t AndRHSMask = AndRHS->getZExtValue(); uint64_t AndRHSMask = AndRHS->getZExtValue();