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Implement sub.ll:test17, -X/C -> X/-C

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16863 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-10-09 02:50:40 +00:00
parent 23e2563226
commit a052f8297a
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Scalar/InstructionCombining.cpp
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@@ -946,6 +946,11 @@ Instruction *InstCombiner::visitDiv(BinaryOperator &I) {
return new ShiftInst(Instruction::Shr, I.getOperand(0), return new ShiftInst(Instruction::Shr, I.getOperand(0),
ConstantUInt::get(Type::UByteTy, C)); ConstantUInt::get(Type::UByteTy, C));
// -X/C -> X/-C
if (RHS->getType()->isSigned())
if (Value *LHSNeg = dyn_castNegVal(I.getOperand(0)))
return BinaryOperator::createDiv(LHSNeg, ConstantExpr::getNeg(RHS));
if (isa<PHINode>(I.getOperand(0)) && !RHS->isNullValue()) if (isa<PHINode>(I.getOperand(0)) && !RHS->isNullValue())
if (Instruction *NV = FoldOpIntoPhi(I)) if (Instruction *NV = FoldOpIntoPhi(I))
return NV; return NV;