diff options
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp index b06bb1bb877..13f3f31fdf9 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp @@ -1335,18 +1335,6 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) { if (AndRHSMask == 1 && match(Op0LHS, m_Zero())) return BinaryOperator::CreateAnd(Op0RHS, AndRHS); - // (A - N) & AndRHS -> -N & AndRHS iff A&AndRHS==0 and AndRHS - // has 1's for all bits that the subtraction with A might affect. - if (Op0I->hasOneUse() && !match(Op0LHS, m_Zero())) { - uint32_t BitWidth = AndRHSMask.getBitWidth(); - uint32_t Zeros = AndRHSMask.countLeadingZeros(); - APInt Mask = APInt::getLowBitsSet(BitWidth, BitWidth - Zeros); - - if (MaskedValueIsZero(Op0LHS, Mask, 0, &I)) { - Value *NewNeg = Builder->CreateNeg(Op0RHS); - return BinaryOperator::CreateAnd(NewNeg, AndRHS); - } - } break; case Instruction::Shl: |
