workaround gcc bug "m" (0)

avoiding useage of ebx

Originally committed as revision 283 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavcodec/i386/mpegvideo_mmx_template.c b/libavcodec/i386/mpegvideo_mmx_template.c
index 71df065..ffe5c84 100644 (file)
--- a/libavcodec/i386/mpegvideo_mmx_template.c
+++ b/libavcodec/i386/mpegvideo_mmx_template.c
@@ -67,17 +67,17 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
 #if 1
        asm volatile (
                "xorl %%edx, %%edx      \n\t"
-               "mul %%ebx              \n\t"
+               "mul %%ecx              \n\t"
                : "=d" (temp_block[0]), "=a"(dummy)
-               : "a" (block[0] + (q >> 1)), "b" (inverse[q])
+               : "a" (block[0] + (q >> 1)), "c" (inverse[q])
        );
 #else
        asm volatile (
                "xorl %%edx, %%edx      \n\t"
-               "divw %%bx              \n\t"
+               "divw %%cx              \n\t"
                "movzwl %%ax, %%eax     \n\t"
                : "=a" (temp_block[0])
-               : "a" (block[0] + (q >> 1)), "b" (q)
+               : "a" (block[0] + (q >> 1)), "c" (q)
                : "%edx"
        );
 #endif
@@ -119,8 +119,10 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
        SPREADW(%%mm3)
        "movd %4, %%mm4                 \n\t"
        SPREADW(%%mm4)
+#ifndef HAVE_MMX2      
        "movd %5, %%mm5                 \n\t"
        SPREADW(%%mm5)
+#endif
        "pxor %%mm7, %%mm7              \n\t"
        "movd %%eax, %%mm2              \n\t"
        SPREADW(%%mm2)
@@ -160,9 +162,9 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
        : "+a" (last_non_zero_p1)
        : "r" (block+64), "r" (qmat+64), 
 #ifdef HAVE_MMX2
-         "m" (maxLevel),          "m" (minLevel),                    "m" (0 /* dummy */), "g" (2*i - 128),
+         "m" (maxLevel),          "m" (minLevel),                    "m" (minLevel /* dummy */), "g" (2*i - 128),
 #else
-         "m" (0x7FFF - maxLevel), "m" (0x7FFF -maxLevel + minLevel), "m" (minLevel),      "g" (2*i - 128),
+         "m" (0x7FFF - maxLevel), "m" (0x7FFF -maxLevel + minLevel), "m" (minLevel),             "g" (2*i - 128),
 #endif
          "r" (inv_zigzag_direct16+64), "r" (temp_block+64)
     );