diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp index 3dbb1b190be..ac921331a01 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp @@ -630,16 +630,6 @@ Value *InstCombiner::SimplifyDemandedUseBits(Value *V, APInt DemandedMask, // Otherwise just hand the sub off to computeKnownBits to fill in // the known zeros and ones. computeKnownBits(V, KnownZero, KnownOne, Depth, CxtI); - - // Turn this into a xor if LHS is 2^n-1 and the remaining bits are known - // zero. - if (ConstantInt *C0 = dyn_cast<ConstantInt>(I->getOperand(0))) { - APInt I0 = C0->getValue(); - if ((I0 + 1).isPowerOf2() && (I0 | KnownZero).isAllOnesValue()) { - Instruction *Xor = BinaryOperator::CreateXor(I->getOperand(1), C0); - return InsertNewInstWith(Xor, *I); - } - } break; case Instruction::Shl: if (ConstantInt *SA = dyn_cast<ConstantInt>(I->getOperand(1))) { |
