sse2 & ssse3 versions of dct_quantize.

core2: mmx2=154 sse2=73 ssse3=66 (cycles)
k8: mmx2=179 sse2=149
p4: mmx2=284 sse2=194

Originally committed as revision 9003 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/i386/mpegvideo_mmx.c

@@ -673,6 +673,12 @@ static void  denoise_dct_sse2(MpegEncContext *s, DCTELEM *block){
     );
 }
 
+#ifdef HAVE_SSSE3
+#define HAVE_SSSE3_BAK
+#endif
+#undef HAVE_SSSE3
+
+#undef HAVE_SSE2
 #undef HAVE_MMX2
 #define RENAME(a) a ## _MMX
 #define RENAMEl(a) a ## _mmx
@@ -685,12 +691,22 @@ static void  denoise_dct_sse2(MpegEncContext *s, DCTELEM *block){
 #define RENAMEl(a) a ## _mmx2
 #include "mpegvideo_mmx_template.c"
 
+#define HAVE_SSE2
 #undef RENAME
 #undef RENAMEl
 #define RENAME(a) a ## _SSE2
 #define RENAMEl(a) a ## _sse2
 #include "mpegvideo_mmx_template.c"
 
+#ifdef HAVE_SSSE3_BAK
+#define HAVE_SSSE3
+#undef RENAME
+#undef RENAMEl
+#define RENAME(a) a ## _SSSE3
+#define RENAMEl(a) a ## _sse2
+#include "mpegvideo_mmx_template.c"
+#endif
+
 void MPV_common_init_mmx(MpegEncContext *s)
 {
     if (mm_flags & MM_MMX) {
@@ -713,6 +729,11 @@ void MPV_common_init_mmx(MpegEncContext *s)
         }
 
         if(dct_algo==FF_DCT_AUTO || dct_algo==FF_DCT_MMX){
+#ifdef HAVE_SSSE3
+            if(mm_flags & MM_SSSE3){
+                s->dct_quantize= dct_quantize_SSSE3;
+            } else
+#endif
             if(mm_flags & MM_SSE2){
                 s->dct_quantize= dct_quantize_SSE2;
             } else if(mm_flags & MM_MMXEXT){