diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp index 64708c4d4f7..063d4a799e4 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp @@ -2512,6 +2512,16 @@ Instruction *InstCombiner::visitXor(BinaryOperator &I) { if ((A == C && B == D) || (A == D && B == C)) return BinaryOperator::CreateXor(A, B); } + // (A | ~B) ^ (~A | B) -> A ^ B + if (match(Op0I, m_Or(m_Value(A), m_Not(m_Value(B)))) && + match(Op1I, m_Or(m_Not(m_Specific(A)), m_Specific(B)))) { + return BinaryOperator::CreateXor(A, B); + } + // (~A | B) ^ (A | ~B) -> A ^ B + if (match(Op0I, m_Or(m_Not(m_Value(A)), m_Value(B))) && + match(Op1I, m_Or(m_Specific(A), m_Not(m_Specific(B))))) { + return BinaryOperator::CreateXor(A, B); + } // (A ^ B)^(A | B) -> A & B if (match(Op0I, m_Xor(m_Value(A), m_Value(B))) && match(Op1I, m_Or(m_Value(C), m_Value(D)))) { |
