Add instcombine patterns for the following transformations:
(x & y) | (x ^ y) -> x | y
(x & y) + (x ^ y) -> x | y
Patch by Manman Ren.
rdar://10770603
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155674 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index 05e702f..6a39fc3 100644
--- a/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -329,6 +329,20 @@
}
}
+ // Check for (x & y) + (x ^ y)
+ {
+ Value *A = 0, *B = 0;
+ if (match(RHS, m_Xor(m_Value(A), m_Value(B))) &&
+ (match(LHS, m_And(m_Specific(A), m_Specific(B))) ||
+ match(LHS, m_And(m_Specific(B), m_Specific(A)))))
+ return BinaryOperator::CreateOr(A, B);
+
+ if (match(LHS, m_Xor(m_Value(A), m_Value(B))) &&
+ (match(RHS, m_And(m_Specific(A), m_Specific(B))) ||
+ match(RHS, m_And(m_Specific(B), m_Specific(A)))))
+ return BinaryOperator::CreateOr(A, B);
+ }
+
return Changed ? &I : 0;
}