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105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/**
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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 */
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