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104 lines
2.7 KiB
104 lines
2.7 KiB
/** |
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* @file libavutil/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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