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Implement: -A*-B == A*B

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5740 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-03-10 23:23:04 +00:00
parent 533741a764
commit a4f445b28c
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -342,6 +342,10 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
}
}
if (Value *Op0v = dyn_castNegVal(Op0)) // -X * -Y = X*Y
if (Value *Op1v = dyn_castNegVal(I.getOperand(1)))
return BinaryOperator::create(Instruction::Mul, Op0v, Op1v);
return Changed ? &I : 0;
}