skip MMX code in rgb24tobgr24 if the size of the input is smaller than the

size of the units the MMX code processes

Originally committed as revision 23015 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

diff --git a/libswscale/rgb2rgb_template.c b/libswscale/rgb2rgb_template.c
index 2e2066b..f06e4ed 100644 (file)
--- a/libswscale/rgb2rgb_template.c
+++ b/libswscale/rgb2rgb_template.c
@@ -1435,6 +1435,8 @@ static inline void RENAME(rgb24tobgr24)(const uint8_t *src, uint8_t *dst, long s
 #ifdef HAVE_MMX
        long mmx_size= 23 - src_size;
        asm volatile (
+               "test %%"REG_a", %%"REG_a"      \n\t"
+               "jns 2f                         \n\t"
                "movq "MANGLE(mask24r)", %%mm5  \n\t"
                "movq "MANGLE(mask24g)", %%mm6  \n\t"
                "movq "MANGLE(mask24b)", %%mm7  \n\t"
@@ -1471,6 +1473,7 @@ static inline void RENAME(rgb24tobgr24)(const uint8_t *src, uint8_t *dst, long s
                MOVNTQ" %%mm1, 16(%2, %%"REG_a")\n\t"
                "add $24, %%"REG_a"             \n\t"
                " js 1b                         \n\t"
+               "2:                             \n\t"
                : "+a" (mmx_size)
                : "r" (src-mmx_size), "r"(dst-mmx_size)
        );