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ffmpeg / libavutil / timer.h @ 2f5421d5

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