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* @file libavutil/timer.h
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* high precision timer, useful to profile code
*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVUTIL_TIMER_H
#define AVUTIL_TIMER_H
#include <stdlib.h>
#include <stdint.h>
#include "config.h"
#if ARCH_X86 || ARCH_PPC || ARCH_BFIN
#define AV_READ_TIME read_time
#if ARCH_X86
static inline uint64_t read_time(void)
{
uint32_t a, d;
__asm__ volatile("rdtsc\n\t"
: "=a" (a), "=d" (d));
return ((uint64_t)d << 32) + a;
}
#elif ARCH_BFIN
static inline uint64_t read_time(void)
{
union {
struct {
unsigned lo;
unsigned hi;
} p;
unsigned long long c;
} t;
__asm__ volatile ("%0=cycles; %1=cycles2;" : "=d" (t.p.lo), "=d" (t.p.hi));
return t.c;
}
#else //FIXME check ppc64
static inline uint64_t read_time(void)
{
uint32_t tbu, tbl, temp;
/* from section 2.2.1 of the 32-bit PowerPC PEM */
__asm__ volatile(
"1:\n"
"mftbu %2\n"
"mftb %0\n"
"mftbu %1\n"
"cmpw %2,%1\n"
"bne 1b\n"
: "=r"(tbl), "=r"(tbu), "=r"(temp)
:
: "cc");
return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
}
#endif
#elif HAVE_GETHRTIME
#define AV_READ_TIME gethrtime
#endif
#ifdef AV_READ_TIME
#define START_TIMER \
uint64_t tend;\
uint64_t tstart= AV_READ_TIME();\
#define STOP_TIMER(id) \
tend= AV_READ_TIME();\
{\
static uint64_t tsum=0;\
static int tcount=0;\
static int tskip_count=0;\
if(tcount<2 || tend - tstart < 8*tsum/tcount || tend - tstart < 2000){\
tsum+= tend - tstart;\
tcount++;\
}else\
tskip_count++;\
if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
av_log(NULL, AV_LOG_ERROR, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n",\
tsum*10/tcount, id, tcount, tskip_count);\
}\
}
#else
#define START_TIMER
#define STOP_TIMER(id) {}
#endif
#endif /* AVUTIL_TIMER_H */