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ffmpeg / libavutil / softfloat.c @ 80a07f6e

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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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#include <inttypes.h>
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#include <stdio.h>
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#include <assert.h>
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#include "softfloat.h"
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#include "common.h"
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#include "log.h"
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#undef printf
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int main(void){
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    SoftFloat one= av_int2sf(1, 0);
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    SoftFloat sf1, sf2;
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    double d1, d2;
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    int i, j;
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    av_log_set_level(AV_LOG_DEBUG);
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    d1= 1;
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    for(i= 0; i<10; i++){
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        d1= 1/(d1+1);
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    }
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    printf("test1 double=%d\n", (int)(d1 * (1<<24)));
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    sf1= one;
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    for(i= 0; i<10; i++){
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        sf1= av_div_sf(one, av_normalize_sf(av_add_sf(one, sf1)));
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    }
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    printf("test1 sf    =%d\n", av_sf2int(sf1, 24));
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    for(i= 0; i<100; i++){
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        START_TIMER
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        d1= i;
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        d2= i/100.0;
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        for(j= 0; j<1000; j++){
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            d1= (d1+1)*d2;
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        }
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        STOP_TIMER("float add mul")
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    }
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    printf("test2 double=%d\n", (int)(d1 * (1<<24)));
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    for(i= 0; i<100; i++){
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        START_TIMER
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        sf1= av_int2sf(i, 0);
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        sf2= av_div_sf(av_int2sf(i, 2), av_int2sf(200, 3));
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        for(j= 0; j<1000; j++){
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            sf1= av_mul_sf(av_add_sf(sf1, one),sf2);
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        }
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        STOP_TIMER("softfloat add mul")
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    }
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    printf("test2 sf    =%d (%d %d)\n", av_sf2int(sf1, 24), sf1.exp, sf1.mant);
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    return 0;
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}