diff --git a/llvm/include/llvm/ADT/StringRef.h b/llvm/include/llvm/ADT/StringRef.h
--- a/llvm/include/llvm/ADT/StringRef.h
+++ b/llvm/include/llvm/ADT/StringRef.h
@@ -884,19 +884,19 @@
   inline bool operator!=(StringRef LHS, StringRef RHS) { return !(LHS == RHS); }
 
   inline bool operator<(StringRef LHS, StringRef RHS) {
-    return LHS.compare(RHS) == -1;
+    return LHS.compare(RHS) < 0;
   }
 
   inline bool operator<=(StringRef LHS, StringRef RHS) {
-    return LHS.compare(RHS) != 1;
+    return LHS.compare(RHS) <= 0;
   }
 
   inline bool operator>(StringRef LHS, StringRef RHS) {
-    return LHS.compare(RHS) == 1;
+    return LHS.compare(RHS) > 0;
   }
 
   inline bool operator>=(StringRef LHS, StringRef RHS) {
-    return LHS.compare(RHS) != -1;
+    return LHS.compare(RHS) >= 0;
   }
 
   inline std::string &operator+=(std::string &buffer, StringRef string) {