(commit by michael)

memset() in MMX

Originally committed as revision 263 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index be76e30..5e79e20 100644 (file)
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -162,7 +162,27 @@ static int h263_decode_frame(AVCodecContext *avctx,
                 s->c_dc_scale = 8;
             }
 
+#ifdef HAVE_MMX
+            if (mm_flags & MM_MMX) {
+                asm volatile(
+                       "pxor %%mm7, %%mm7              \n\t"
+                       "movl $-128*6, %%eax            \n\t"
+                       "1:                             \n\t"
+                       "movq %%mm7, (%0, %%eax)        \n\t"
+                       "movq %%mm7, 8(%0, %%eax)       \n\t"
+                       "movq %%mm7, 16(%0, %%eax)      \n\t"
+                       "movq %%mm7, 24(%0, %%eax)      \n\t"
+                       "addl $32, %%eax                \n\t"
+                       " js 1b                         \n\t"
+                       : : "r" (((int)s->block)+128*6)
+                       : "%eax"
+                );
+            }else{
+                memset(s->block, 0, sizeof(s->block));
+            }
+#else
             memset(s->block, 0, sizeof(s->block));
+#endif
             s->mv_dir = MV_DIR_FORWARD;
             s->mv_type = MV_TYPE_16X16; 
             if (s->h263_msmpeg4) {