diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp index 67a54018c37e..d92e126b080c 100644 --- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp @@ -694,11 +694,12 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) { return ReplaceInstUsesWith(I, RHS); // X + 0 --> X - // NOTE: -0 + +0 = +0 in non-default rounding modes. When we support them - // we must disable this. Note that 0.0-0.0 = -0.0, so this doesn't hold - // for SUB. - if (RHSC->isNullValue()) + if (!I.getType()->isFloatingPoint()) { // NOTE: -0 + +0 = +0. + if (RHSC->isNullValue()) + return ReplaceInstUsesWith(I, LHS); + } else if (cast<ConstantFP>(RHSC)->isExactlyValue(-0.0)) { return ReplaceInstUsesWith(I, LHS); + } // X + (signbit) --> X ^ signbit if (ConstantInt *CI = dyn_cast<ConstantInt>(RHSC)) {