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cleanup, no functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83795 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-10-11 21:36:10 +00:00
parent d2c58366d8
commit a249847008
1 changed files with 33 additions and 34 deletions
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67
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -2656,14 +2656,14 @@ static bool isSignBitCheck(ICmpInst::Predicate pred, ConstantInt *RHS,
Instruction *InstCombiner::visitMul(BinaryOperator &I) {
bool Changed = SimplifyCommutative(I);
Value *Op0 = I.getOperand(0);
Value *Op0 = I.getOperand(0), *Op1 = I.getOperand(1);
if (isa<UndefValue>(I.getOperand(1))) // undef * X -> 0
if (isa<UndefValue>(Op1)) // undef * X -> 0
return ReplaceInstUsesWith(I, Constant::getNullValue(I.getType()));
// Simplify mul instructions with a constant RHS.
if (Constant *Op1 = dyn_cast<Constant>(I.getOperand(1))) {
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op1)) {
if (Constant *Op1C = dyn_cast<Constant>(Op1)) {
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op1C)) {
// ((X << C1)*C2) == (X * (C2 << C1))
if (BinaryOperator *SI = dyn_cast<BinaryOperator>(Op0))
@ -2673,7 +2673,7 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
ConstantExpr::getShl(CI, ShOp));
if (CI->isZero())
return ReplaceInstUsesWith(I, Op1); // X * 0 == 0
return ReplaceInstUsesWith(I, Op1C); // X * 0 == 0
if (CI->equalsInt(1)) // X * 1 == X
return ReplaceInstUsesWith(I, Op0);
if (CI->isAllOnesValue()) // X * -1 == 0 - X
@ -2684,11 +2684,11 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
return BinaryOperator::CreateShl(Op0,
ConstantInt::get(Op0->getType(), Val.logBase2()));
}
} else if (isa<VectorType>(Op1->getType())) {
if (Op1->isNullValue())
return ReplaceInstUsesWith(I, Op1);
} else if (isa<VectorType>(Op1C->getType())) {
if (Op1C->isNullValue())
return ReplaceInstUsesWith(I, Op1C);
if (ConstantVector *Op1V = dyn_cast<ConstantVector>(Op1)) {
if (ConstantVector *Op1V = dyn_cast<ConstantVector>(Op1C)) {
if (Op1V->isAllOnesValue()) // X * -1 == 0 - X
return BinaryOperator::CreateNeg(Op0, I.getName());
@ -2703,10 +2703,10 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
if (BinaryOperator *Op0I = dyn_cast<BinaryOperator>(Op0))
if (Op0I->getOpcode() == Instruction::Add && Op0I->hasOneUse() &&
isa<ConstantInt>(Op0I->getOperand(1)) && isa<ConstantInt>(Op1)) {
isa<ConstantInt>(Op0I->getOperand(1)) && isa<ConstantInt>(Op1C)) {
// Canonicalize (X+C1)*C2 -> X*C2+C1*C2.
Value *Add = Builder->CreateMul(Op0I->getOperand(0), Op1, "tmp");
Value *C1C2 = Builder->CreateMul(Op1, Op0I->getOperand(1));
Value *Add = Builder->CreateMul(Op0I->getOperand(0), Op1C, "tmp");
Value *C1C2 = Builder->CreateMul(Op1C, Op0I->getOperand(1));
return BinaryOperator::CreateAdd(Add, C1C2);
}
@ -2722,23 +2722,23 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
}
if (Value *Op0v = dyn_castNegVal(Op0)) // -X * -Y = X*Y
if (Value *Op1v = dyn_castNegVal(I.getOperand(1)))
if (Value *Op1v = dyn_castNegVal(Op1))
return BinaryOperator::CreateMul(Op0v, Op1v);
// (X / Y) * Y = X - (X % Y)
// (X / Y) * -Y = (X % Y) - X
{
Value *Op1 = I.getOperand(1);
Value *Op1C = Op1;
BinaryOperator *BO = dyn_cast<BinaryOperator>(Op0);
if (!BO ||
(BO->getOpcode() != Instruction::UDiv &&
BO->getOpcode() != Instruction::SDiv)) {
Op1 = Op0;
BO = dyn_cast<BinaryOperator>(I.getOperand(1));
Op1C = Op0;
BO = dyn_cast<BinaryOperator>(Op1);
}
Value *Neg = dyn_castNegVal(Op1);
Value *Neg = dyn_castNegVal(Op1C);
if (BO && BO->hasOneUse() &&
(BO->getOperand(1) == Op1 || BO->getOperand(1) == Neg) &&
(BO->getOperand(1) == Op1C || BO->getOperand(1) == Neg) &&
(BO->getOpcode() == Instruction::UDiv ||
BO->getOpcode() == Instruction::SDiv)) {
Value *Op0BO = BO->getOperand(0), *Op1BO = BO->getOperand(1);
@ -2746,10 +2746,9 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
// If the division is exact, X % Y is zero.
if (SDivOperator *SDiv = dyn_cast<SDivOperator>(BO))
if (SDiv->isExact()) {
if (Op1BO == Op1)
if (Op1BO == Op1C)
return ReplaceInstUsesWith(I, Op0BO);
else
return BinaryOperator::CreateNeg(Op0BO);
return BinaryOperator::CreateNeg(Op0BO);
}
Value *Rem;
@ -2759,7 +2758,7 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
Rem = Builder->CreateSRem(Op0BO, Op1BO);
Rem->takeName(BO);
if (Op1BO == Op1)
if (Op1BO == Op1C)
return BinaryOperator::CreateSub(Op0BO, Rem);
return BinaryOperator::CreateSub(Rem, Op0BO);
}
@ -2767,15 +2766,15 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
/// i1 mul -> i1 and.
if (I.getType() == Type::getInt1Ty(*Context))
return BinaryOperator::CreateAnd(Op0, I.getOperand(1));
return BinaryOperator::CreateAnd(Op0, Op1);
// X*(1 << Y) --> X << Y
// (1 << Y)*X --> X << Y
{
Value *Y;
if (match(Op0, m_Shl(m_One(), m_Value(Y))))
return BinaryOperator::CreateShl(I.getOperand(1), Y);
if (match(I.getOperand(1), m_Shl(m_One(), m_Value(Y))))
return BinaryOperator::CreateShl(Op1, Y);
if (match(Op1, m_Shl(m_One(), m_Value(Y))))
return BinaryOperator::CreateShl(Op0, Y);
}
@ -2788,9 +2787,9 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
Value *BoolCast = 0, *OtherOp = 0;
if (MaskedValueIsZero(Op0, Negative2))
BoolCast = Op0, OtherOp = I.getOperand(1);
else if (MaskedValueIsZero(I.getOperand(1), Negative2))
BoolCast = I.getOperand(1), OtherOp = Op0;
BoolCast = Op0, OtherOp = Op1;
else if (MaskedValueIsZero(Op1, Negative2))
BoolCast = Op1, OtherOp = Op0;
if (BoolCast) {
Value *V = Builder->CreateSub(Constant::getNullValue(I.getType()),
@ -2804,17 +2803,17 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
Instruction *InstCombiner::visitFMul(BinaryOperator &I) {
bool Changed = SimplifyCommutative(I);
Value *Op0 = I.getOperand(0);
Value *Op0 = I.getOperand(0), *Op1 = I.getOperand(1);
// Simplify mul instructions with a constant RHS...
if (Constant *Op1 = dyn_cast<Constant>(I.getOperand(1))) {
if (ConstantFP *Op1F = dyn_cast<ConstantFP>(Op1)) {
if (Constant *Op1C = dyn_cast<Constant>(Op1)) {
if (ConstantFP *Op1F = dyn_cast<ConstantFP>(Op1C)) {
// "In IEEE floating point, x*1 is not equivalent to x for nans. However,
// ANSI says we can drop signals, so we can do this anyway." (from GCC)
if (Op1F->isExactlyValue(1.0))
return ReplaceInstUsesWith(I, Op0); // Eliminate 'mul double %X, 1.0'
} else if (isa<VectorType>(Op1->getType())) {
if (ConstantVector *Op1V = dyn_cast<ConstantVector>(Op1)) {
} else if (isa<VectorType>(Op1C->getType())) {
if (ConstantVector *Op1V = dyn_cast<ConstantVector>(Op1C)) {
// As above, vector X*splat(1.0) -> X in all defined cases.
if (Constant *Splat = Op1V->getSplatValue()) {
if (ConstantFP *F = dyn_cast<ConstantFP>(Splat))
@ -2835,7 +2834,7 @@ Instruction *InstCombiner::visitFMul(BinaryOperator &I) {
}
if (Value *Op0v = dyn_castFNegVal(Op0)) // -X * -Y = X*Y
if (Value *Op1v = dyn_castFNegVal(I.getOperand(1)))
if (Value *Op1v = dyn_castFNegVal(Op1))
return BinaryOperator::CreateFMul(Op0v, Op1v);
return Changed ? &I : 0;