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Move Sub simplifications and additional Add simplifications out of

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instcombine and into InstructionSimplify.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121861 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2010-12-15 14:07:39 +00:00
parent f8b1a5ea96
commit fea3b218d6
4 changed files with 77 additions and 39 deletions
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32
lib/Transforms/InstCombine/InstCombineAddSub.cpp
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@@ -154,17 +154,6 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
// X + X --> X << 1
if (LHS == RHS)
return BinaryOperator::CreateShl(LHS, ConstantInt::get(I.getType(), 1));
if (Instruction *RHSI = dyn_cast<Instruction>(RHS)) {
if (RHSI->getOpcode() == Instruction::Sub)
if (LHS == RHSI->getOperand(1)) // A + (B - A) --> B
return ReplaceInstUsesWith(I, RHSI->getOperand(0));
}
if (Instruction *LHSI = dyn_cast<Instruction>(LHS)) {
if (LHSI->getOpcode() == Instruction::Sub)
if (RHS == LHSI->getOperand(1)) // (B - A) + A --> B
return ReplaceInstUsesWith(I, LHSI->getOperand(0));
}
}
// -A + B --> B - A
@@ -201,11 +190,6 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
if (dyn_castFoldableMul(RHS, C2) == LHS)
return BinaryOperator::CreateMul(LHS, AddOne(C2));
// X + ~X --> -1 since ~X = -X-1
if (match(LHS, m_Not(m_Specific(RHS))) ||
match(RHS, m_Not(m_Specific(LHS))))
return ReplaceInstUsesWith(I, Constant::getAllOnesValue(I.getType()));
// A+B --> A|B iff A and B have no bits set in common.
if (const IntegerType *IT = dyn_cast<IntegerType>(I.getType())) {
APInt Mask = APInt::getAllOnesValue(IT->getBitWidth());
@@ -547,8 +531,9 @@ Value *InstCombiner::OptimizePointerDifference(Value *LHS, Value *RHS,
Instruction *InstCombiner::visitSub(BinaryOperator &I) {
Value *Op0 = I.getOperand(0), *Op1 = I.getOperand(1);
if (Op0 == Op1) // sub X, X -> 0
return ReplaceInstUsesWith(I, Constant::getNullValue(I.getType()));
if (Value *V = SimplifySubInst(Op0, Op1, I.hasNoSignedWrap(),
I.hasNoUnsignedWrap(), TD))
return ReplaceInstUsesWith(I, V);
if (Instruction *NV = SimplifyByFactorizing(I)) // (A*B)-(A*C) -> A*(B-C)
return NV;
@@ -561,10 +546,6 @@ Instruction *InstCombiner::visitSub(BinaryOperator &I) {
return Res;
}
if (isa<UndefValue>(Op0))
return ReplaceInstUsesWith(I, Op0); // undef - X -> undef
if (isa<UndefValue>(Op1))
return ReplaceInstUsesWith(I, Op1); // X - undef -> undef
if (I.getType()->isIntegerTy(1))
return BinaryOperator::CreateXor(Op0, Op1);
@@ -693,12 +674,7 @@ Instruction *InstCombiner::visitSub(BinaryOperator &I) {
}
if (BinaryOperator *Op0I = dyn_cast<BinaryOperator>(Op0)) {
if (Op0I->getOpcode() == Instruction::Add) {
if (Op0I->getOperand(0) == Op1) // (Y+X)-Y == X
return ReplaceInstUsesWith(I, Op0I->getOperand(1));
else if (Op0I->getOperand(1) == Op1) // (X+Y)-Y == X
return ReplaceInstUsesWith(I, Op0I->getOperand(0));
} else if (Op0I->getOpcode() == Instruction::Sub) {
if (Op0I->getOpcode() == Instruction::Sub) {
if (Op0I->getOperand(0) == Op1) // (X-Y)-X == -Y
return BinaryOperator::CreateNeg(Op0I->getOperand(1),
I.getName());