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This patch implements transform for pattern "( A & (~B)) | (A ^ B) -> (A ^ B)"
Differential Revision: http://reviews.llvm.org/D4652 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214477 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2010,6 +2010,16 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) {
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match(Op1, m_Not(m_Specific(A))))
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return BinaryOperator::CreateOr(Builder->CreateNot(A), B);
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// (A & (~B)) | (A ^ B) -> (A ^ B)
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if (match(Op0, m_And(m_Value(A), m_Not(m_Value(B)))) &&
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match(Op1, m_Xor(m_Specific(A), m_Specific(B))))
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return BinaryOperator::CreateXor(A, B);
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// (A ^ B) | ( A & (~B)) -> (A ^ B)
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if (match(Op0, m_Xor(m_Value(A), m_Value(B))) &&
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match(Op1, m_And(m_Specific(A), m_Not(m_Specific(B)))))
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return BinaryOperator::CreateXor(A, B);
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// (A & C)|(B & D)
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Value *C = nullptr, *D = nullptr;
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if (match(Op0, m_And(m_Value(A), m_Value(C))) &&
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@ -449,3 +449,23 @@ define i32 @test42(i32 %a, i32 %b) {
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%or = or i32 %xor, %and
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ret i32 %or
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}
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define i32 @test43(i32 %a, i32 %b) {
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; CHECK-LABEL: test43(
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; CHECK-NEXT: %or = xor i32 %a, %b
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%neg = xor i32 %b, -1
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%and = and i32 %a, %neg
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%xor = xor i32 %a, %b
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%or = or i32 %and, %xor
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ret i32 %or
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}
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define i32 @test44(i32 %a, i32 %b) {
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; CHECK-LABEL: test44(
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; CHECK-NEXT: %or = xor i32 %a, %b
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%xor = xor i32 %a, %b
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%neg = xor i32 %b, -1
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%and = and i32 %a, %neg
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%or = or i32 %xor, %and
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ret i32 %or
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}
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