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Revert r153423 as this is causing failures on our internal nightly testers.

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Original commit message:
Use the new range metadata in computeMaskedBits and add a new optimization to
instruction simplify that lets us remove an and when loading a boolean value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153452 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier
2012-03-26 18:07:14 +00:00
parent 81748bc320
commit cde6650bd0
3 changed files with 0 additions and 56 deletions
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15
lib/Analysis/InstructionSimplify.cpp
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@ -1370,21 +1370,6 @@ static Value *SimplifyAndInst(Value *Op0, Value *Op1, const Query &Q,
return Op1;
}
unsigned Bitwidth = Op1->getType()->getScalarSizeInBits();
APInt DemandedMask = APInt::getAllOnesValue(Bitwidth);
APInt KnownZero0 = APInt::getNullValue(Bitwidth);
APInt KnownOne0 = APInt::getNullValue(Bitwidth);
ComputeMaskedBits(Op0, DemandedMask, KnownZero0, KnownOne0);
APInt KnownZero1 = APInt::getNullValue(Bitwidth);
APInt KnownOne1 = APInt::getNullValue(Bitwidth);
ComputeMaskedBits(Op1, DemandedMask, KnownZero1, KnownOne1);
if ((KnownZero0 | KnownOne1).isAllOnesValue())
return Op0;
if ((KnownZero1 | KnownOne0).isAllOnesValue())
return Op1;
// Try some generic simplifications for associative operations.
if (Value *V = SimplifyAssociativeBinOp(Instruction::And, Op0, Op1, Q,
MaxRecurse))