Merged r3211:3213 from branches/SDL-1.2: YUV MMX inline asm for GCC.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402482

src/video/SDL_yuv_sw.c

@@ -117,7 +117,7 @@ struct SDL_SW_YUVTexture
 
 /* The colorspace conversion functions */
 
-#if 0                           /*defined(__GNUC__) && defined(__i386__) && SDL_ASSEMBLY_ROUTINES */
+#if (__GNUC__ > 2) && defined(__i386__) && SDL_ASSEMBLY_ROUTINES
 extern void Color565DitherYV12MMX1X(int *colortab, Uint32 * rgb_2_pix,
                                     unsigned char *lum, unsigned char *cr,
                                     unsigned char *cb, unsigned char *out,
@@ -978,7 +978,7 @@ SDL_SW_SetupYUVDisplay(SDL_SW_YUVTexture * swdata, Uint32 target_format)
     case SDL_PIXELFORMAT_YV12:
     case SDL_PIXELFORMAT_IYUV:
         if (SDL_BYTESPERPIXEL(target_format) == 2) {
-#if 0                           /*defined(__GNUC__) && defined(__i386__) && SDL_ASSEMBLY_ROUTINES */
+#if (__GNUC__ > 2) && defined(__i386__) && SDL_ASSEMBLY_ROUTINES
             /* inline assembly functions */
             if (SDL_HasMMX() && (Rmask == 0xF800) &&
                 (Gmask == 0x07E0) && (Bmask == 0x001F) && (width & 15) == 0) {
@@ -998,7 +998,7 @@ SDL_SW_SetupYUVDisplay(SDL_SW_YUVTexture * swdata, Uint32 target_format)
             swdata->Display2X = Color24DitherYV12Mod2X;
         }
         if (SDL_BYTESPERPIXEL(target_format) == 4) {
-#if 0                           /*defined(__GNUC__) && defined(__i386__) && SDL_ASSEMBLY_ROUTINES */
+#if (__GNUC__ > 2) && defined(__i386__) && SDL_ASSEMBLY_ROUTINES
             /* inline assembly functions */
             if (SDL_HasMMX() && (Rmask == 0x00FF0000) &&
                 (Gmask == 0x0000FF00) &&