| /* |
| * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <inttypes.h> |
| #include <stdio.h> |
| #include "softfloat.h" |
| #include "common.h" |
| #include "log.h" |
| |
| #undef printf |
| |
| static const SoftFloat FLOAT_0_017776489257 = {0x1234, 12}; |
| static const SoftFloat FLOAT_1374_40625 = {0xabcd, 25}; |
| static const SoftFloat FLOAT_0_1249694824218 = {0xFFF, 15}; |
| |
| |
| static av_const double av_sf2double(SoftFloat v) { |
| v.exp -= ONE_BITS +1; |
| if(v.exp > 0) return (double)v.mant * (double)(1 << v.exp); |
| else return (double)v.mant / (double)(1 << (-v.exp)); |
| } |
| |
| void av_sincos_sf(int a, int *s, int *c) |
| { |
| int idx, sign; |
| int sv, cv; |
| int st, ct; |
| |
| idx = a >> 26; |
| sign = (idx << 27) >> 31; |
| cv = av_costbl_1_sf[idx & 0xf]; |
| cv = (cv ^ sign) - sign; |
| |
| idx -= 8; |
| sign = (idx << 27) >> 31; |
| sv = av_costbl_1_sf[idx & 0xf]; |
| sv = (sv ^ sign) - sign; |
| |
| idx = a >> 21; |
| ct = av_costbl_2_sf[idx & 0x1f]; |
| st = av_sintbl_2_sf[idx & 0x1f]; |
| |
| idx = (int)(((int64_t)cv * ct - (int64_t)sv * st + 0x20000000) >> 30); |
| |
| sv = (int)(((int64_t)cv * st + (int64_t)sv * ct + 0x20000000) >> 30); |
| |
| cv = idx; |
| |
| idx = a >> 16; |
| ct = av_costbl_3_sf[idx & 0x1f]; |
| st = av_sintbl_3_sf[idx & 0x1f]; |
| |
| idx = (int)(((int64_t)cv * ct - (int64_t)sv * st + 0x20000000) >> 30); |
| |
| sv = (int)(((int64_t)cv * st + (int64_t)sv * ct + 0x20000000) >> 30); |
| cv = idx; |
| |
| idx = a >> 11; |
| |
| ct = (int)(((int64_t)av_costbl_4_sf[idx & 0x1f] * (0x800 - (a & 0x7ff)) + |
| (int64_t)av_costbl_4_sf[(idx & 0x1f)+1]*(a & 0x7ff) + |
| 0x400) >> 11); |
| st = (int)(((int64_t)av_sintbl_4_sf[idx & 0x1f] * (0x800 - (a & 0x7ff)) + |
| (int64_t)av_sintbl_4_sf[(idx & 0x1f) + 1] * (a & 0x7ff) + |
| 0x400) >> 11); |
| |
| *c = (int)(((int64_t)cv * ct + (int64_t)sv * st + 0x20000000) >> 30); |
| |
| *s = (int)(((int64_t)cv * st + (int64_t)sv * ct + 0x20000000) >> 30); |
| } |
| |
| int main(void){ |
| SoftFloat one= av_int2sf(1, 0); |
| SoftFloat sf1, sf2, sf3; |
| double d1, d2, d3; |
| int i, j; |
| av_log_set_level(AV_LOG_DEBUG); |
| |
| d1= 1; |
| for(i= 0; i<10; i++){ |
| d1= 1/(d1+1); |
| } |
| printf("test1 double=%d\n", (int)(d1 * (1<<24))); |
| |
| sf1= one; |
| for(i= 0; i<10; i++){ |
| sf1= av_div_sf(one, av_normalize_sf(av_add_sf(one, sf1))); |
| } |
| printf("test1 sf =%d\n", av_sf2int(sf1, 24)); |
| |
| |
| for(i= 0; i<100; i++){ |
| START_TIMER |
| d1= i; |
| d2= i/100.0; |
| for(j= 0; j<1000; j++){ |
| d1= (d1+1)*d2; |
| } |
| STOP_TIMER("float add mul") |
| } |
| printf("test2 double=%d\n", (int)(d1 * (1<<24))); |
| |
| for(i= 0; i<100; i++){ |
| START_TIMER |
| sf1= av_int2sf(i, 0); |
| sf2= av_div_sf(av_int2sf(i, 2), av_int2sf(200, 3)); |
| for(j= 0; j<1000; j++){ |
| sf1= av_mul_sf(av_add_sf(sf1, one),sf2); |
| } |
| STOP_TIMER("softfloat add mul") |
| } |
| printf("test2 sf =%d (%d %d)\n", av_sf2int(sf1, 24), sf1.exp, sf1.mant); |
| |
| d1 = 0.0177764893; |
| d2 = 1374.40625; |
| d3 = 0.1249694824; |
| d2 += d1; |
| d3 += d2; |
| printf("test3 double: %.10lf\n", d3); |
| |
| sf1 = FLOAT_0_017776489257; |
| sf2 = FLOAT_1374_40625; |
| sf3 = FLOAT_0_1249694824218; |
| sf2 = av_add_sf(sf1, sf2); |
| sf3 = av_add_sf(sf3, sf2); |
| printf("test3 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf3), sf3.mant, sf3.exp); |
| |
| sf1 = av_int2sf(0xFFFFFFF0, 0); |
| printf("test4 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf1), sf1.mant, sf1.exp); |
| sf1 = av_int2sf(0x00000010, 0); |
| printf("test4 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf1), sf1.mant, sf1.exp); |
| |
| sf1 = av_int2sf(0x1FFFFFFF, 0); |
| printf("test4 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf1), sf1.mant, sf1.exp); |
| sf1 = av_int2sf(0xE0000001, 0); |
| printf("test4 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf1), sf1.mant, sf1.exp); |
| |
| return 0; |
| |
| } |