2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "softfloat.h"
26 void av_sincos_sf(int a, int *s, int *c)
33 sign = (idx << 27) >> 31;
34 cv = av_costbl_1_sf[idx & 0xf];
35 cv = (cv ^ sign) - sign;
38 sign = (idx << 27) >> 31;
39 sv = av_costbl_1_sf[idx & 0xf];
40 sv = (sv ^ sign) - sign;
43 ct = av_costbl_2_sf[idx & 0x1f];
44 st = av_sintbl_2_sf[idx & 0x1f];
46 idx = (int)(((int64_t)cv * ct - (int64_t)sv * st + 0x20000000) >> 30);
48 sv = (int)(((int64_t)cv * st + (int64_t)sv * ct + 0x20000000) >> 30);
53 ct = av_costbl_3_sf[idx & 0x1f];
54 st = av_sintbl_3_sf[idx & 0x1f];
56 idx = (int)(((int64_t)cv * ct - (int64_t)sv * st + 0x20000000) >> 30);
58 sv = (int)(((int64_t)cv * st + (int64_t)sv * ct + 0x20000000) >> 30);
63 ct = (int)(((int64_t)av_costbl_4_sf[idx & 0x1f] * (0x800 - (a & 0x7ff)) +
64 (int64_t)av_costbl_4_sf[(idx & 0x1f)+1]*(a & 0x7ff) +
66 st = (int)(((int64_t)av_sintbl_4_sf[idx & 0x1f] * (0x800 - (a & 0x7ff)) +
67 (int64_t)av_sintbl_4_sf[(idx & 0x1f) + 1] * (a & 0x7ff) +
70 *c = (int)(((int64_t)cv * ct + (int64_t)sv * st + 0x20000000) >> 30);
72 *s = (int)(((int64_t)cv * st + (int64_t)sv * ct + 0x20000000) >> 30);
78 static const SoftFloat FLOAT_0_017776489257 = {0x1234, 12};
79 static const SoftFloat FLOAT_1374_40625 = {0xabcd, 25};
80 static const SoftFloat FLOAT_0_1249694824218 = {0xFFF, 15};
84 SoftFloat one= av_int2sf(1, 0);
85 SoftFloat sf1, sf2, sf3;
88 av_log_set_level(AV_LOG_DEBUG);
94 printf("test1 double=%d\n", (int)(d1 * (1<<24)));
98 sf1= av_div_sf(one, av_normalize_sf(av_add_sf(one, sf1)));
100 printf("test1 sf =%d\n", av_sf2int(sf1, 24));
103 for(i= 0; i<100; i++){
107 for(j= 0; j<1000; j++){
110 STOP_TIMER("float add mul")
112 printf("test2 double=%d\n", (int)(d1 * (1<<24)));
114 for(i= 0; i<100; i++){
116 sf1= av_int2sf(i, 0);
117 sf2= av_div_sf(av_int2sf(i, 2), av_int2sf(200, 3));
118 for(j= 0; j<1000; j++){
119 sf1= av_mul_sf(av_add_sf(sf1, one),sf2);
121 STOP_TIMER("softfloat add mul")
123 printf("test2 sf =%d (%d %d)\n", av_sf2int(sf1, 24), sf1.exp, sf1.mant);
130 printf("test3 double: %.10lf\n", d3);
132 sf1 = FLOAT_0_017776489257;
133 sf2 = FLOAT_1374_40625;
134 sf3 = FLOAT_0_1249694824218;
135 sf2 = av_add_sf(sf1, sf2);
136 sf3 = av_add_sf(sf3, sf2);
137 printf("test3 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf3), sf3.mant, sf3.exp);
139 sf1 = av_int2sf(0xFFFFFFF0, 0);
140 printf("test4 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf1), sf1.mant, sf1.exp);
141 sf1 = av_int2sf(0x00000010, 0);
142 printf("test4 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf1), sf1.mant, sf1.exp);
144 sf1 = av_int2sf(0x1FFFFFFF, 0);
145 printf("test4 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf1), sf1.mant, sf1.exp);
146 sf1 = av_int2sf(0xE0000001, 0);
147 printf("test4 softfloat: %.10lf (0x%08x %d)\n", (double)av_sf2double(sf1), sf1.mant, sf1.exp);