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cleanups

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83797 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-10-11 22:00:32 +00:00
parent 833f0cc57f
commit 7acdf1de06
1 changed files with 18 additions and 20 deletions
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38
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -4041,34 +4041,32 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
}
if (ConstantInt *AndRHS = dyn_cast<ConstantInt>(Op1)) {
const APInt& AndRHSMask = AndRHS->getValue();
const APInt &AndRHSMask = AndRHS->getValue();
APInt NotAndRHS(~AndRHSMask);
// Optimize a variety of ((val OP C1) & C2) combinations...
if (isa<BinaryOperator>(Op0)) {
Instruction *Op0I = cast<Instruction>(Op0);
if (BinaryOperator *Op0I = dyn_cast<BinaryOperator>(Op0)) {
Value *Op0LHS = Op0I->getOperand(0);
Value *Op0RHS = Op0I->getOperand(1);
switch (Op0I->getOpcode()) {
default: break;
case Instruction::Xor:
case Instruction::Or:
// If the mask is only needed on one incoming arm, push it up.
if (Op0I->hasOneUse()) {
if (MaskedValueIsZero(Op0LHS, NotAndRHS)) {
// Not masking anything out for the LHS, move to RHS.
Value *NewRHS = Builder->CreateAnd(Op0RHS, AndRHS,
Op0RHS->getName()+".masked");
return BinaryOperator::Create(
cast<BinaryOperator>(Op0I)->getOpcode(), Op0LHS, NewRHS);
}
if (!isa<Constant>(Op0RHS) &&
MaskedValueIsZero(Op0RHS, NotAndRHS)) {
// Not masking anything out for the RHS, move to LHS.
Value *NewLHS = Builder->CreateAnd(Op0LHS, AndRHS,
Op0LHS->getName()+".masked");
return BinaryOperator::Create(
cast<BinaryOperator>(Op0I)->getOpcode(), NewLHS, Op0RHS);
}
if (!Op0I->hasOneUse()) break;
if (MaskedValueIsZero(Op0LHS, NotAndRHS)) {
// Not masking anything out for the LHS, move to RHS.
Value *NewRHS = Builder->CreateAnd(Op0RHS, AndRHS,
Op0RHS->getName()+".masked");
return BinaryOperator::Create(Op0I->getOpcode(), Op0LHS, NewRHS);
}
if (!isa<Constant>(Op0RHS) &&
MaskedValueIsZero(Op0RHS, NotAndRHS)) {
// Not masking anything out for the RHS, move to LHS.
Value *NewLHS = Builder->CreateAnd(Op0LHS, AndRHS,
Op0LHS->getName()+".masked");
return BinaryOperator::Create(Op0I->getOpcode(), NewLHS, Op0RHS);
}
break;
@ -5045,7 +5043,7 @@ Instruction *InstCombiner::visitXor(BinaryOperator &I) {
if (ConstantInt *RHS = dyn_cast<ConstantInt>(Op1)) {
if (RHS == ConstantInt::getTrue(*Context) && Op0->hasOneUse()) {
if (RHS->isOne() && Op0->hasOneUse()) {
// xor (cmp A, B), true = not (cmp A, B) = !cmp A, B
if (ICmpInst *ICI = dyn_cast<ICmpInst>(Op0))
return new ICmpInst(ICI->getInversePredicate(),