1 files changed, 9 insertions, 1 deletions
diff --git a/llvm/include/llvm/ADT/APInt.h b/llvm/include/llvm/ADT/APInt.h
index 220e408da15..a29cfe5fbca 100644
--- a/llvm/include/llvm/ADT/APInt.h
+++ b/llvm/include/llvm/ADT/APInt.h
@@ -691,7 +691,15 @@ public:
   /// Performs a bitwise AND operation on this APInt and RHS. RHS is
   /// logically zero-extended or truncated to match the bit-width of
   /// the LHS.
-  APInt &operator&=(uint64_t RHS);
+  APInt &operator&=(uint64_t RHS) {
+    if (isSingleWord()) {
+      VAL &= RHS;
+      return *this;
+    }
+    pVal[0] &= RHS;
+    memset(pVal+1, 0, (getNumWords() - 1) * APINT_WORD_SIZE);
+    return *this;
+  }
 
   /// \brief Bitwise OR assignment operator.
   ///