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Implement rem.ll:test3
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14640 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1528,6 +1528,24 @@ Instruction *InstCombiner::visitSetCondInst(BinaryOperator &I) {
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// operand is a constant, simplify a bit.
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if (BinaryOperator *BO = dyn_cast<BinaryOperator>(Op0)) {
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switch (BO->getOpcode()) {
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case Instruction::Rem:
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// If we have a signed (X % (2^c)) == 0, turn it into an unsigned one.
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if (CI->isNullValue() && isa<ConstantSInt>(BO->getOperand(1)) &&
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BO->hasOneUse() &&
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cast<ConstantSInt>(BO->getOperand(1))->getValue() > 1)
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if (unsigned L2 =
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Log2(cast<ConstantSInt>(BO->getOperand(1))->getValue())) {
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const Type *UTy = BO->getType()->getUnsignedVersion();
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Value *NewX = InsertNewInstBefore(new CastInst(BO->getOperand(0),
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UTy, "tmp"), I);
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Constant *RHSCst = ConstantUInt::get(UTy, 1ULL << L2);
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Value *NewRem =InsertNewInstBefore(BinaryOperator::createRem(NewX,
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RHSCst, BO->getName()), I);
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return BinaryOperator::create(I.getOpcode(), NewRem,
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Constant::getNullValue(UTy));
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}
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break;
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case Instruction::Add:
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// Replace ((add A, B) != C) with (A != C-B) if B & C are constants.
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if (ConstantInt *BOp1C = dyn_cast<ConstantInt>(BO->getOperand(1))) {
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