merge asm fragments in H264_CHROMA_MC2_TMPL()

10% faster avg_h264_chroma_mc2_mmx2()
5% faster put_h264_chroma_mc2_mmx2()

Originally committed as revision 7897 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/i386/dsputil_h264_template_mmx.c

@@ -267,8 +267,6 @@ static void H264_CHROMA_MC2_TMPL(uint8_t *dst/*align 2*/, uint8_t *src/*align 1*
 {
     int CD=((1<<16)-1)*x*y + 8*y;
     int AB=((8<<16)-8)*x + 64 - CD;
-    int i;
-
     asm volatile(
         /* mm5 = {A,B,A,B} */
         /* mm6 = {C,D,C,D} */
@@ -277,50 +275,41 @@ static void H264_CHROMA_MC2_TMPL(uint8_t *dst/*align 2*/, uint8_t *src/*align 1*
         "punpckldq %%mm5, %%mm5\n\t"
         "punpckldq %%mm6, %%mm6\n\t"
         "pxor %%mm7, %%mm7\n\t"
-        :: "r"(AB), "r"(CD));
-
-    asm volatile(
         /* mm0 = src[0,1,1,2] */
-        "movd %0, %%mm0\n\t"
+        "movd %2, %%mm0\n\t"
         "punpcklbw %%mm7, %%mm0\n\t"
         "pshufw $0x94, %%mm0, %%mm0\n\t"
-        :: "m"(src[0]));
+        :: "r"(AB), "r"(CD), "m"(src[0]));
 
-    for(i=0; i<h; i++) {
-        asm volatile(
-            /* mm1 = A * src[0,1] + B * src[1,2] */
-            "movq    %%mm0, %%mm1\n\t"
-            "pmaddwd %%mm5, %%mm1\n\t"
-            ::);
 
-        src += stride;
-        asm volatile(
-            /* mm0 = src[0,1,1,2] */
-            "movd %0, %%mm0\n\t"
-            "punpcklbw %%mm7, %%mm0\n\t"
-            "pshufw $0x94, %%mm0, %%mm0\n\t"
-            :: "m"(src[0]));
-
-        asm volatile(
-            /* mm1 += C * src[0,1] + D * src[1,2] */
-            "movq    %%mm0, %%mm2\n\t"
-            "pmaddwd %%mm6, %%mm2\n\t"
-            "paddw   %%mm2, %%mm1\n\t"
-            ::);
+    asm volatile(
+        "1:\n\t"
+        "addl %4, %1\n\t"
+        /* mm1 = A * src[0,1] + B * src[1,2] */
+        "movq    %%mm0, %%mm1\n\t"
+        "pmaddwd %%mm5, %%mm1\n\t"
+        /* mm0 = src[0,1,1,2] */
+        "movd (%1), %%mm0\n\t"
+        "punpcklbw %%mm7, %%mm0\n\t"
+        "pshufw $0x94, %%mm0, %%mm0\n\t"
+        /* mm1 += C * src[0,1] + D * src[1,2] */
+        "movq    %%mm0, %%mm2\n\t"
+        "pmaddwd %%mm6, %%mm2\n\t"
+        "paddw   %%mm2, %%mm1\n\t"
+        /* dst[0,1] = pack((mm1 + 32) >> 6) */
+        "paddw %3, %%mm1\n\t"
+        "psrlw $6, %%mm1\n\t"
+        "packssdw %%mm7, %%mm1\n\t"
+        "packuswb %%mm7, %%mm1\n\t"
+        /* writes garbage to the right of dst.
+            * ok because partitions are processed from left to right. */
+        H264_CHROMA_OP4((%0), %%mm1, %%mm3)
+        "movd %%mm1, (%0)\n\t"
+        "addl %4, %0\n\t"
+        "subl $1, %2\n\t"
+        "jnz 1b\n\t"
+        : "+r" (dst), "+r"(src), "+r"(h) : "m" (ff_pw_32), "r"(stride));
 
-        asm volatile(
-            /* dst[0,1] = pack((mm1 + 32) >> 6) */
-            "paddw %1, %%mm1\n\t"
-            "psrlw $6, %%mm1\n\t"
-            "packssdw %%mm7, %%mm1\n\t"
-            "packuswb %%mm7, %%mm1\n\t"
-            /* writes garbage to the right of dst.
-             * ok because partitions are processed from left to right. */
-            H264_CHROMA_OP4(%0, %%mm1, %%mm3)
-            "movd %%mm1, %0\n\t"
-            : "=m" (dst[0]) : "m" (ff_pw_32));
-        dst += stride;
-    }
 }
 #endif