diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 15 |
1 files changed, 2 insertions, 13 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 9c6ff8acc5..e4ddecf756 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -2934,20 +2934,9 @@ Instruction *InstCombiner::visitSDiv(BinaryOperator &I) { if (Value *LHSNeg = dyn_castNegVal(Op0)) { if (ConstantInt *CI = dyn_cast<ConstantInt>(LHSNeg)) { ConstantInt *RHSNeg = cast<ConstantInt>(ConstantExpr::getNeg(RHS)); - APInt RHSNegAPI(RHSNeg->getValue()); - - APInt NegOne = -APInt(RHSNeg->getBitWidth(), 1, true); - APInt TwoToExp(RHSNeg->getBitWidth(), 1 << (RHSNeg->getBitWidth() - 1)); - - if ((RHS->getValue().isNegative() && - RHSNegAPI.slt(TwoToExp - 1)) || - (RHS->getValue().isNonNegative() && - RHSNegAPI.sgt(TwoToExp * NegOne))) { + if (RHS != RHSNeg) { ConstantInt *CINeg = cast<ConstantInt>(ConstantExpr::getNeg(CI)); - APInt CINegAPI(CINeg->getValue()); - - if ((CI->getValue().isNegative() && CINegAPI.slt(TwoToExp - 1)) || - (CI->getValue().isNonNegative() && CINegAPI.sgt(TwoToExp*NegOne))) + if (CI != CINeg) return BinaryOperator::CreateSDiv(LHSNeg, ConstantExpr::getNeg(RHS)); } |