1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index 36a776618f5..776bef36abf 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -1717,6 +1717,14 @@ Instruction *InstCombiner::visitSub(BinaryOperator &I) {
       return BinaryOperator::CreateNeg(Y);
   }
 
+  // (sub (or A, B) (and A, B)) --> (xor A, B)
+  {
+    Value *A, *B;
+    if (match(Op1, m_And(m_Value(A), m_Value(B))) &&
+        match(Op0, m_c_Or(m_Specific(A), m_Specific(B))))
+      return BinaryOperator::CreateXor(A, B);
+  }
+
   // (sub (or A, B), (xor A, B)) --> (and A, B)
   {
     Value *A, *B;