diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 507e6f2a85..ce052f724e 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -1762,11 +1762,12 @@ bool InstCombiner::SimplifyDemandedBits(Value *V, APInt DemandedMask, APInt KnownZero2(BitWidth, 0), KnownOne2(BitWidth, 0); APInt AllOnes = APInt::getAllOnesValue(BitWidth); - ComputeMaskedBits(I->getOperand(0), AllOnes, - KnownZero2, KnownOne2, Depth+1); + if (SimplifyDemandedBits(I->getOperand(0), AllOnes, + KnownZero2, KnownOne2, Depth+1)) + return true; + uint32_t Leaders = KnownZero2.countLeadingOnes(); - APInt HighZeros = APInt::getHighBitsSet(BitWidth, Leaders); - if (SimplifyDemandedBits(I->getOperand(1), ~HighZeros, + if (SimplifyDemandedBits(I->getOperand(1), AllOnes, KnownZero2, KnownOne2, Depth+1)) return true; |