some benchmarking code

Originally committed as revision 1901 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 22 years ago
parent 9fe690c88f
commit b534c7f92a
  1. 29
      libavcodec/common.h

@ -1090,6 +1090,35 @@ if((y)<(x)){\
}
#endif
#ifdef ARCH_X86
static inline long long rdtsc()
{
long long l;
asm volatile( "rdtsc\n\t"
: "=A" (l)
);
return l;
}
#define START_TIMER \
static uint64_t tsum=0;\
static int tcount=0;\
static int tskip_count=0;\
uint64_t tend;\
uint64_t tstart= rdtsc();\
#define STOP_TIMER(id) \
tend= rdtsc();\
if(tcount<2 || tend - tstart < 4*tsum/tcount){\
tsum+= tend - tstart;\
tcount++;\
}else\
tskip_count++;\
if(256*256*256*64%(tcount+tskip_count)==0){\
fprintf(stderr, "%Ld dezicycles in %s, %d runs, %d skips\n", tsum*10/tcount, id, tcount, tskip_count);\
}
#endif
#define CLAMP_TO_8BIT(d) ((d > 0xff) ? 0xff : (d < 0) ? 0 : d)
/* avoid usage of various functions */

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