diff -Nuarp opencv-3.4.16/modules/core/include/opencv2/core/cvdef.h opencv-3.4.16.unsafe_xadd/modules/core/include/opencv2/core/cvdef.h
--- opencv-3.4.16/modules/core/include/opencv2/core/cvdef.h	2021-10-08 11:31:56.000000000 +0800
+++ opencv-3.4.16.unsafe_xadd/modules/core/include/opencv2/core/cvdef.h	2021-11-24 10:59:23.713464681 +0800
@@ -532,33 +532,7 @@ Cv64suf;
 *          exchange-add operation for atomic operations on reference counters            *
 \****************************************************************************************/
 
-#ifdef CV_XADD
-  // allow to use user-defined macro
-#elif defined __GNUC__ || defined __clang__
-#  if defined __clang__ && __clang_major__ >= 3 && !defined __ANDROID__ && !defined __EMSCRIPTEN__ && !defined(__CUDACC__)  && !defined __INTEL_COMPILER
-#    ifdef __ATOMIC_ACQ_REL
-#      define CV_XADD(addr, delta) __c11_atomic_fetch_add((_Atomic(int)*)(addr), delta, __ATOMIC_ACQ_REL)
-#    else
-#      define CV_XADD(addr, delta) __atomic_fetch_add((_Atomic(int)*)(addr), delta, 4)
-#    endif
-#  else
-#    if defined __ATOMIC_ACQ_REL && !defined __clang__
-       // version for gcc >= 4.7
-#      define CV_XADD(addr, delta) (int)__atomic_fetch_add((unsigned*)(addr), (unsigned)(delta), __ATOMIC_ACQ_REL)
-#    else
-#      define CV_XADD(addr, delta) (int)__sync_fetch_and_add((unsigned*)(addr), (unsigned)(delta))
-#    endif
-#  endif
-#elif defined _MSC_VER && !defined RC_INVOKED
-#  include <intrin.h>
-#  define CV_XADD(addr, delta) (int)_InterlockedExchangeAdd((long volatile*)addr, delta)
-#else
-  #ifdef OPENCV_FORCE_UNSAFE_XADD
-    CV_INLINE int CV_XADD(int* addr, int delta) { int tmp = *addr; *addr += delta; return tmp; }
-  #else
-    #error "OpenCV: can't define safe CV_XADD macro for current platform (unsupported). Define CV_XADD macro through custom port header (see OPENCV_INCLUDE_PORT_FILE)"
-  #endif
-#endif
+CV_INLINE int CV_XADD(void* addr, int delta) { int tmp = *(int*)addr; *(int*)addr += delta; return tmp; }
 
 
 /****************************************************************************************\