1 files changed, 5 insertions, 1 deletions
diff --git a/include/llvm/Support/KnownBits.h b/include/llvm/Support/KnownBits.h
index 2c77d40559b9..7a4de3e5ff12 100644
--- a/include/llvm/Support/KnownBits.h
+++ b/include/llvm/Support/KnownBits.h
@@ -25,7 +25,7 @@ struct KnownBits {
   APInt One;
 
 private:
-  // Internal constructor for creating a ConstantRange from two APInts.
+  // Internal constructor for creating a KnownBits from two APInts.
   KnownBits(APInt Zero, APInt One)
       : Zero(std::move(Zero)), One(std::move(One)) {}
 
@@ -193,6 +193,10 @@ public:
   unsigned countMaxPopulation() const {
     return getBitWidth() - Zero.countPopulation();
   }
+
+  /// Compute known bits resulting from adding LHS and RHS.
+  static KnownBits computeForAddSub(bool Add, bool NSW, const KnownBits &LHS,
+                                    KnownBits RHS);
 };
 
 } // end namespace llvm