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Implement rem.ll:test[7-9] and PR712

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26415 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-02-28 05:49:21 +00:00
parent c9c85c4768
commit 9794392781
1 changed files with 22 additions and 6 deletions
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28
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1867,12 +1867,28 @@ Instruction *InstCombiner::visitRem(BinaryOperator &I) {
if (isPowerOf2_64(C->getValue()))
return BinaryOperator::createAnd(Op0, SubOne(C));
if (SelectInst *SI = dyn_cast<SelectInst>(Op0))
if (Instruction *R = FoldOpIntoSelect(I, SI, this))
return R;
if (isa<PHINode>(Op0))
if (Instruction *NV = FoldOpIntoPhi(I))
return NV;
if (Instruction *Op0I = dyn_cast<Instruction>(Op0)) {
if (SelectInst *SI = dyn_cast<SelectInst>(Op0I)) {
if (Instruction *R = FoldOpIntoSelect(I, SI, this))
return R;
} else if (isa<PHINode>(Op0I)) {
if (Instruction *NV = FoldOpIntoPhi(I))
return NV;
} else if (Op0I->getOpcode() == Instruction::Mul) {
// X*C1%C2 --> 0 iff C1%C2 == 0
if (ConstantInt *MulRHS = dyn_cast<ConstantInt>(Op0I->getOperand(1))) {
if (ConstantExpr::getRem(MulRHS, RHS)->isNullValue())
return ReplaceInstUsesWith(I, Constant::getNullValue(I.getType()));
}
} else if (Op0I->getOpcode() == Instruction::Shl) {
// (X<<C1)%C2 --> 0 iff (1<<C1)%C2 == 0
if (Constant *ShRHS = dyn_cast<Constant>(Op0I->getOperand(1))) {
ShRHS = ConstantExpr::getShl(ConstantInt::get(I.getType(), 1), ShRHS);
if (ConstantExpr::getRem(ShRHS, RHS)->isNullValue())
return ReplaceInstUsesWith(I, Constant::getNullValue(I.getType()));
}
}
}
}
if (Instruction *RHSI = dyn_cast<Instruction>(I.getOperand(1))) {