/src/ffmpeg/libavutil/ffmath.h
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1 | | /* |
2 | | * copyright (c) 2016 Ganesh Ajjanagadde <gajjanag@gmail.com> |
3 | | * |
4 | | * This file is part of FFmpeg. |
5 | | * |
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. |
10 | | * |
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. |
15 | | * |
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 |
19 | | */ |
20 | | |
21 | | /** |
22 | | * @file |
23 | | * internal math functions header |
24 | | */ |
25 | | |
26 | | #ifndef AVUTIL_FFMATH_H |
27 | | #define AVUTIL_FFMATH_H |
28 | | |
29 | | #include "attributes.h" |
30 | | #include "libm.h" |
31 | | |
32 | | /** |
33 | | * Compute 10^x for floating point values. Note: this function is by no means |
34 | | * "correctly rounded", and is meant as a fast, reasonably accurate approximation. |
35 | | * For instance, maximum relative error for the double precision variant is |
36 | | * ~ 1e-13 for very small and very large values. |
37 | | * This is ~2x faster than GNU libm's approach, which is still off by 2ulp on |
38 | | * some inputs. |
39 | | * @param x exponent |
40 | | * @return 10^x |
41 | | */ |
42 | | static av_always_inline double ff_exp10(double x) |
43 | 12.6M | { |
44 | 12.6M | return exp2(M_LOG2_10 * x); |
45 | 12.6M | } Line | Count | Source | 43 | 194 | { | 44 | 194 | return exp2(M_LOG2_10 * x); | 45 | 194 | } |
Line | Count | Source | 43 | 4.52M | { | 44 | 4.52M | return exp2(M_LOG2_10 * x); | 45 | 4.52M | } |
Line | Count | Source | 43 | 36.5k | { | 44 | 36.5k | return exp2(M_LOG2_10 * x); | 45 | 36.5k | } |
acelp_pitch_delay.c:ff_exp10 Line | Count | Source | 43 | 8.00M | { | 44 | 8.00M | return exp2(M_LOG2_10 * x); | 45 | 8.00M | } |
Unexecuted instantiation: wmaenc.c:ff_exp10 Unexecuted instantiation: aacenc.c:ff_exp10 Unexecuted instantiation: aaccoder.c:ff_exp10 Unexecuted instantiation: aacenc_is.c:ff_exp10 Unexecuted instantiation: aacenc_ltp.c:ff_exp10 Unexecuted instantiation: aacenc_pred.c:ff_exp10 Unexecuted instantiation: aacenc_tns.c:ff_exp10 Unexecuted instantiation: aacpsy.c:ff_exp10 Unexecuted instantiation: dcaenc.c:ff_exp10 Line | Count | Source | 43 | 100k | { | 44 | 100k | return exp2(M_LOG2_10 * x); | 45 | 100k | } |
|
46 | | |
47 | | static av_always_inline float ff_exp10f(float x) |
48 | 0 | { |
49 | 0 | return exp2f(M_LOG2_10 * x); |
50 | 0 | } Unexecuted instantiation: eval.c:ff_exp10f Unexecuted instantiation: wmaprodec.c:ff_exp10f Unexecuted instantiation: imc.c:ff_exp10f Unexecuted instantiation: acelp_pitch_delay.c:ff_exp10f Unexecuted instantiation: wmaenc.c:ff_exp10f Unexecuted instantiation: aacenc.c:ff_exp10f Unexecuted instantiation: aaccoder.c:ff_exp10f Unexecuted instantiation: aacenc_is.c:ff_exp10f Unexecuted instantiation: aacenc_ltp.c:ff_exp10f Unexecuted instantiation: aacenc_pred.c:ff_exp10f Unexecuted instantiation: aacenc_tns.c:ff_exp10f Unexecuted instantiation: aacpsy.c:ff_exp10f Unexecuted instantiation: dcaenc.c:ff_exp10f Unexecuted instantiation: on2avc.c:ff_exp10f |
51 | | |
52 | | /** |
53 | | * Compute x^y for floating point x, y. Note: this function is faster than the |
54 | | * libm variant due to mainly 2 reasons: |
55 | | * 1. It does not handle any edge cases. In particular, this is only guaranteed |
56 | | * to work correctly for x > 0. |
57 | | * 2. It is not as accurate as a standard nearly "correctly rounded" libm variant. |
58 | | * @param x base |
59 | | * @param y exponent |
60 | | * @return x^y |
61 | | */ |
62 | | static av_always_inline float ff_fast_powf(float x, float y) |
63 | 0 | { |
64 | 0 | return expf(logf(x) * y); |
65 | 0 | } Unexecuted instantiation: eval.c:ff_fast_powf Unexecuted instantiation: wmaprodec.c:ff_fast_powf Unexecuted instantiation: imc.c:ff_fast_powf Unexecuted instantiation: acelp_pitch_delay.c:ff_fast_powf Unexecuted instantiation: wmaenc.c:ff_fast_powf Unexecuted instantiation: aacenc.c:ff_fast_powf Unexecuted instantiation: aaccoder.c:ff_fast_powf Unexecuted instantiation: aacenc_is.c:ff_fast_powf Unexecuted instantiation: aacenc_ltp.c:ff_fast_powf Unexecuted instantiation: aacenc_pred.c:ff_fast_powf Unexecuted instantiation: aacenc_tns.c:ff_fast_powf Unexecuted instantiation: aacpsy.c:ff_fast_powf Unexecuted instantiation: dcaenc.c:ff_fast_powf Unexecuted instantiation: on2avc.c:ff_fast_powf |
66 | | |
67 | | #endif /* AVUTIL_FFMATH_H */ |