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swscale: Execute sfence and emms depending on runtime flags. 

Originally committed as revision 29127 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Ramiro Polla 2009-04-02 18:31:22 +00:00
parent 3dd2f87e61
commit 5b7c7dd329
1 changed files with 4 additions and 17 deletions
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21
libswscale/swscale_template.c
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@ -26,15 +26,6 @@
#undef PAVGB
#undef PREFETCH
#undef PREFETCHW
#undef EMMS
#undef SFENCE
#if HAVE_AMD3DNOW
/* On K6 femms is faster than emms. On K7 femms is directly mapped to emms. */
#define EMMS "femms"
#else
#define EMMS "emms"
#endif
#if HAVE_AMD3DNOW
#define PREFETCH "prefetch"
@ -47,12 +38,6 @@
#define PREFETCHW " # nop"
#endif
#if HAVE_MMX2
#define SFENCE "sfence"
#else
#define SFENCE " # nop"
#endif
#if HAVE_MMX2
#define PAVGB(a,b) "pavgb " #a ", " #b " \n\t"
#elif HAVE_AMD3DNOW
@ -3209,8 +3194,10 @@ static int RENAME(swScale)(SwsContext *c, uint8_t* src[], int srcStride[], int s
fillPlane(dst[3], dstStride[3], dstW, dstY-lastDstY, lastDstY, 255);
#if HAVE_MMX
__asm__ volatile(SFENCE:::"memory");
__asm__ volatile(EMMS:::"memory");
if (flags & SWS_CPU_CAPS_MMX2 ) __asm__ volatile("sfence":::"memory");
/* On K6 femms is faster than emms. On K7 femms is directly mapped to emms. */
if (flags & SWS_CPU_CAPS_3DNOW) __asm__ volatile("femms" :::"memory");
else __asm__ volatile("emms" :::"memory");
#endif
/* store changed local vars back in the context */
c->dstY= dstY;