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77a2a8b4 | 1 | /* s_sinf.c -- float version of s_sin.c. |
b168057a | 2 | Copyright (C) 2011-2015 Free Software Foundation, Inc. |
77a2a8b4 AZ |
3 | This file is part of the GNU C Library. |
4 | Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011 | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Library General Public License as | |
8 | published by the Free Software Foundation; either version 2 of the | |
9 | License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library 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 | Library General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Library General Public | |
59ba27a6 PE |
17 | License along with the GNU C Library; see the file COPYING.LIB. If |
18 | not, see <http://www.gnu.org/licenses/>. */ | |
77a2a8b4 AZ |
19 | |
20 | #include <errno.h> | |
1ed0291c RH |
21 | #include <math.h> |
22 | #include <math_private.h> | |
77a2a8b4 AZ |
23 | |
24 | static const float pio4 = 7.8539801e-1; | |
25 | ||
26 | float | |
27 | __sinf (float x) | |
28 | { | |
29 | float y[2], z = 0.0; | |
30 | float ix; | |
31 | int32_t n; | |
32 | ||
33 | ix = __builtin_fabsf (x); | |
34 | ||
35 | /* |x| ~< pi/4 */ | |
36 | if (ix <= pio4) | |
37 | { | |
38 | return __kernel_sinf (x, z, 0); | |
39 | /* sin(Inf or NaN) is NaN */ | |
40 | } | |
41 | else if (isnanf (ix)) | |
42 | { | |
43 | return x - x; | |
44 | } | |
45 | else if (isinff (ix)) | |
46 | { | |
47 | __set_errno (EDOM); | |
48 | return x - x; | |
49 | } | |
50 | ||
51 | /* argument reduction needed */ | |
52 | else | |
53 | { | |
54 | n = __ieee754_rem_pio2f (x, y); | |
55 | switch (n & 3) | |
56 | { | |
57 | case 0: | |
58 | return __kernel_sinf (y[0], y[1], 1); | |
59 | case 1: | |
60 | return __kernel_cosf (y[0], y[1]); | |
61 | case 2: | |
62 | return -__kernel_sinf (y[0], y[1], 1); | |
63 | default: | |
64 | return -__kernel_cosf (y[0], y[1]); | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
69 | weak_alias (__sinf, sinf) |