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Canonicalize (X+C1)*C2 -> X*C2+C1*C2

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This implements Transforms/InstCombine/add.ll:test31


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26519 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-04 06:04:02 +00:00
parent 5128d2323f
commit ab51f3fa96
1 changed files with 13 additions and 0 deletions
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13
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1622,6 +1622,19 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
if (Op1F->getValue() == 1.0)
return ReplaceInstUsesWith(I, Op0); // Eliminate 'mul double %X, 1.0'
}
if (BinaryOperator *Op0I = dyn_cast<BinaryOperator>(Op0))
if (Op0I->getOpcode() == Instruction::Add && Op0I->hasOneUse() &&
isa<ConstantInt>(Op0I->getOperand(1))) {
// Canonicalize (X+C1)*C2 -> X*C2+C1*C2.
Instruction *Add = BinaryOperator::createMul(Op0I->getOperand(0),
Op1, "tmp");
InsertNewInstBefore(Add, I);
Value *C1C2 = ConstantExpr::getMul(Op1,
cast<Constant>(Op0I->getOperand(1)));
return BinaryOperator::createAdd(Add, C1C2);
}
// Try to fold constant mul into select arguments.
if (SelectInst *SI = dyn_cast<SelectInst>(Op0))