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Canonicalize (X+C1)*C2 -> X*C2+C1*C2
This implements Transforms/InstCombine/add.ll:test31 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26519 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1622,6 +1622,19 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
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if (Op1F->getValue() == 1.0)
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return ReplaceInstUsesWith(I, Op0); // Eliminate 'mul double %X, 1.0'
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}
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if (BinaryOperator *Op0I = dyn_cast<BinaryOperator>(Op0))
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if (Op0I->getOpcode() == Instruction::Add && Op0I->hasOneUse() &&
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isa<ConstantInt>(Op0I->getOperand(1))) {
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// Canonicalize (X+C1)*C2 -> X*C2+C1*C2.
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Instruction *Add = BinaryOperator::createMul(Op0I->getOperand(0),
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Op1, "tmp");
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InsertNewInstBefore(Add, I);
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Value *C1C2 = ConstantExpr::getMul(Op1,
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cast<Constant>(Op0I->getOperand(1)));
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return BinaryOperator::createAdd(Add, C1C2);
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}
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// Try to fold constant mul into select arguments.
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if (SelectInst *SI = dyn_cast<SelectInst>(Op0))
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