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InstCombine: Implement X - A*-B -> X + A*B.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119984 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2010-11-22 20:31:27 +00:00
parent 28ef0a5719
commit 93f8455d73
3 changed files with 29 additions and 16 deletions
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9
lib/Transforms/InstCombine/InstCombineAddSub.cpp
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@ -675,6 +675,15 @@ Instruction *InstCombiner::visitSub(BinaryOperator &I) {
C2);
return BinaryOperator::CreateMul(Op0, CP1);
}
// X - A*-B -> X + A*B
// X - -A*B -> X + A*B
Value *A, *B;
if (match(Op1I, m_Mul(m_Value(A), m_Neg(m_Value(B)))) ||
match(Op1I, m_Mul(m_Neg(m_Value(A)), m_Value(B)))) {
Value *NewMul = Builder->CreateMul(A, B);
return BinaryOperator::CreateAdd(Op0, NewMul);
}
}
}