Deprecate and undocument the FORCE{MMX|SSE|SSE2|SSE3} flags. These were originally introduced in TurboJPEG/IPP as a way to override the automatic CPU selection in the underlying IPP codec, which was closed source. They are not meaningful anymore, since libjpeg-turbo provides environment variables to accomplish the same thing and since it no longer necessarily uses x86 SIMD code behind the scenes.

turbojpeg.h

@@ -322,26 +322,6 @@ enum TJCS
  * OpenGL) order, not top-down (X11) order.
  */
 #define TJFLAG_BOTTOMUP        2
-/**
- * Turn off CPU auto-detection and force TurboJPEG to use MMX code (if the
- * underlying codec supports it.)
- */
-#define TJFLAG_FORCEMMX        8
-/**
- * Turn off CPU auto-detection and force TurboJPEG to use SSE code (if the
- * underlying codec supports it.)
- */
-#define TJFLAG_FORCESSE       16
-/**
- * Turn off CPU auto-detection and force TurboJPEG to use SSE2 code (if the
- * underlying codec supports it.)
- */
-#define TJFLAG_FORCESSE2      32
-/**
- * Turn off CPU auto-detection and force TurboJPEG to use SSE3 code (if the
- * underlying codec supports it.)
- */
-#define TJFLAG_FORCESSE3     128
 /**
  * When decompressing an image that was compressed using chrominance
  * subsampling, use the fastest chrominance upsampling algorithm available in
@@ -1056,6 +1036,13 @@ DLLEXPORT void DLLCALL tjFree(unsigned char *buffer);
 DLLEXPORT char* DLLCALL tjGetErrorStr(void);
 
 
+/* Deprecated functions and macros */
+#define TJFLAG_FORCEMMX        8
+#define TJFLAG_FORCESSE       16
+#define TJFLAG_FORCESSE2      32
+#define TJFLAG_FORCESSE3     128
+
+
 /* Backward compatibility functions and macros (nothing to see here) */
 #define NUMSUBOPT TJ_NUMSAMP
 #define TJ_444 TJSAMP_444