2
* @file libavutil/timer.h
3
* high precision timer, useful to profile code
5
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
7
* This file is part of FFmpeg.
9
* FFmpeg is free software; you can redistribute it and/or
10
* modify it under the terms of the GNU Lesser General Public
11
* License as published by the Free Software Foundation; either
12
* version 2.1 of the License, or (at your option) any later version.
14
* FFmpeg is distributed in the hope that it will be useful,
15
* but WITHOUT ANY WARRANTY; without even the implied warranty of
16
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17
* Lesser General Public License for more details.
19
* You should have received a copy of the GNU Lesser General Public
20
* License along with FFmpeg; if not, write to the Free Software
21
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24
#ifndef AVUTIL_TIMER_H
25
#define AVUTIL_TIMER_H
31
#if ARCH_X86 || ARCH_PPC || ARCH_BFIN
32
#define AV_READ_TIME read_time
34
static inline uint64_t read_time(void)
37
__asm__ volatile("rdtsc\n\t"
38
: "=a" (a), "=d" (d));
39
return ((uint64_t)d << 32) + a;
42
static inline uint64_t read_time(void)
51
__asm__ volatile ("%0=cycles; %1=cycles2;" : "=d" (t.p.lo), "=d" (t.p.hi));
54
#else //FIXME check ppc64
55
static inline uint64_t read_time(void)
57
uint32_t tbu, tbl, temp;
59
/* from section 2.2.1 of the 32-bit PowerPC PEM */
67
: "=r"(tbl), "=r"(tbu), "=r"(temp)
71
return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
75
#define AV_READ_TIME gethrtime
81
uint64_t tstart= AV_READ_TIME();\
83
#define STOP_TIMER(id) \
84
tend= AV_READ_TIME();\
86
static uint64_t tsum=0;\
88
static int tskip_count=0;\
89
if(tcount<2 || tend - tstart < 8*tsum/tcount || tend - tstart < 2000){\
90
tsum+= tend - tstart;\
94
if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
95
av_log(NULL, AV_LOG_ERROR, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n",\
96
tsum*10/tcount, id, tcount, tskip_count);\
101
#define STOP_TIMER(id) {}
104
#endif /* AVUTIL_TIMER_H */