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 60e81ebfd0c..add2f29b341 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp @@ -2010,6 +2010,16 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) { match(Op1, m_Not(m_Specific(A)))) return BinaryOperator::CreateOr(Builder->CreateNot(A), B); + // (A & (~B)) | (A ^ B) -> (A ^ B) + if (match(Op0, m_And(m_Value(A), m_Not(m_Value(B)))) && + match(Op1, m_Xor(m_Specific(A), m_Specific(B)))) + return BinaryOperator::CreateXor(A, B); + + // (A ^ B) | ( A & (~B)) -> (A ^ B) + if (match(Op0, m_Xor(m_Value(A), m_Value(B))) && + match(Op1, m_And(m_Specific(A), m_Not(m_Specific(B))))) + return BinaryOperator::CreateXor(A, B); + // (A & C)|(B & D) Value *C = nullptr, *D = nullptr; if (match(Op0, m_And(m_Value(A), m_Value(C))) && |
