diff -Nuarp opencv-2.4.13.7/modules/core/include/opencv2/core/operations.hpp opencv-2.4.13.7.unsafe_xadd/modules/core/include/opencv2/core/operations.hpp
--- opencv-2.4.13.7/modules/core/include/opencv2/core/operations.hpp	2018-07-02 05:41:56.000000000 +0800
+++ opencv-2.4.13.7.unsafe_xadd/modules/core/include/opencv2/core/operations.hpp	2021-05-11 15:43:01.953963662 +0800
@@ -52,46 +52,8 @@
 #ifdef __cplusplus
 
 /////// exchange-add operation for atomic operations on reference counters ///////
-#ifdef CV_XADD
-  // allow to use user-defined macro
-#elif defined __GNUC__
-
-  #if defined __clang__ && __clang_major__ >= 3 && !defined __ANDROID__ && !defined __EMSCRIPTEN__  && !defined(__CUDACC__)
-    #ifdef __ATOMIC_SEQ_CST
-        #define CV_XADD(addr, delta) __c11_atomic_fetch_add((_Atomic(int)*)(addr), (delta), __ATOMIC_SEQ_CST)
-    #else
-        #define CV_XADD(addr, delta) __atomic_fetch_add((_Atomic(int)*)(addr), (delta), 5)
-    #endif
-  #elif __GNUC__*10 + __GNUC_MINOR__ >= 42
-
-    #if !(defined WIN32 || defined _WIN32) && (defined __i486__ || defined __i586__ || \
-        defined __i686__ || defined __MMX__ || defined __SSE__  || defined __ppc__) || \
-        defined _STLPORT_MAJOR || defined _LIBCPP_VERSION || \
-        defined __EMSCRIPTEN__
-
-      #define CV_XADD __sync_fetch_and_add
-    #else
-      #include <ext/atomicity.h>
-      #define CV_XADD __gnu_cxx::__exchange_and_add
-    #endif
-
-  #else
-    #include <bits/atomicity.h>
-    #if __GNUC__*10 + __GNUC_MINOR__ >= 34
-      #define CV_XADD __gnu_cxx::__exchange_and_add
-    #else
-      #define CV_XADD __exchange_and_add
-    #endif
-  #endif
-
-#elif defined WIN32 || defined _WIN32 || defined WINCE
-  namespace cv { CV_EXPORTS int _interlockedExchangeAdd(int* addr, int delta); }
-  #define CV_XADD cv::_interlockedExchangeAdd
-
-#else
-  static inline int CV_XADD(int* addr, int delta)
-  { int tmp = *addr; *addr += delta; return tmp; }
-#endif
+static inline int CV_XADD(int* addr, int delta)
+{ int tmp = *addr; *addr += delta; return tmp; }
 
 #include <limits>