projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 7799b7b3 | 1 | /* Compute sine and cosine of argument. |
| 940f0754 | 2 | Copyright (C) 1997, 2000 Free Software Foundation, Inc. |
| 7799b7b3 UD |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
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. | |
| 7799b7b3 UD |
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 | |
| 41bdb6e2 | 14 | Lesser General Public License for more details. |
| 7799b7b3 | 15 | |
| 41bdb6e2 AJ |
16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; if not, write to the Free | |
| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 19 | 02111-1307 USA. */ | |
| 7799b7b3 UD |
20 | |
| 21 | #include <math.h> | |
| 22 | ||
| 23 | #include "math_private.h" | |
| 24 | ||
| 25 | ||
| 26 | void | |
| 27 | __sincosf (float x, float *sinx, float *cosx) | |
| 28 | { | |
| 29 | int32_t ix; | |
| 30 | ||
| 31 | /* High word of x. */ | |
| 32 | GET_FLOAT_WORD (ix, x); | |
| 33 | ||
| 34 | /* |x| ~< pi/4 */ | |
| 35 | ix &= 0x7fffffff; | |
| 36 | if (ix <= 0x3f490fd8) | |
| 37 | { | |
| 38 | *sinx = __kernel_sinf (x, 0.0, 0); | |
| 39 | *cosx = __kernel_cosf (x, 0.0); | |
| 40 | } | |
| 940f0754 | 41 | else if (ix>=0x7f800000) |
| 7799b7b3 UD |
42 | { |
| 43 | /* sin(Inf or NaN) is NaN */ | |
| 44 | *sinx = *cosx = x - x; | |
| 45 | } | |
| 46 | else | |
| 47 | { | |
| 48 | /* Argument reduction needed. */ | |
| 49 | float y[2]; | |
| 50 | int n; | |
| 51 | ||
| 52 | n = __ieee754_rem_pio2f (x, y); | |
| 53 | switch (n & 3) | |
| 54 | { | |
| 55 | case 0: | |
| 56 | *sinx = __kernel_sinf (y[0], y[1], 1); | |
| 57 | *cosx = __kernel_cosf (y[0], y[1]); | |
| 58 | break; | |
| 59 | case 1: | |
| 60 | *sinx = __kernel_cosf (y[0], y[1]); | |
| 61 | *cosx = -__kernel_sinf (y[0], y[1], 1); | |
| 62 | break; | |
| 63 | case 2: | |
| 64 | *sinx = -__kernel_sinf (y[0], y[1], 1); | |
| 65 | *cosx = -__kernel_cosf (y[0], y[1]); | |
| 66 | break; | |
| 67 | default: | |
| 68 | *sinx = -__kernel_cosf (y[0], y[1]); | |
| 69 | *cosx = __kernel_sinf (y[0], y[1], 1); | |
| 70 | break; | |
| 71 | } | |
| 72 | } | |
| 73 | } | |
| 74 | weak_alias (__sincosf, sincosf) |