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Implement sub.ll:test17, -X/C -> X/-C
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16863 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -946,6 +946,11 @@ Instruction *InstCombiner::visitDiv(BinaryOperator &I) {
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return new ShiftInst(Instruction::Shr, I.getOperand(0),
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ConstantUInt::get(Type::UByteTy, C));
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// -X/C -> X/-C
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if (RHS->getType()->isSigned())
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if (Value *LHSNeg = dyn_castNegVal(I.getOperand(0)))
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return BinaryOperator::createDiv(LHSNeg, ConstantExpr::getNeg(RHS));
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if (isa<PHINode>(I.getOperand(0)) && !RHS->isNullValue())
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if (Instruction *NV = FoldOpIntoPhi(I))
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return NV;
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