projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| f964490f RM |
1 | /* Compute sine and cosine of argument. |
| 2 | Copyright (C) 1997,1999,2004,2006 Free Software Foundation, Inc. | |
| 3 | This file is part of the GNU C Library. | |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and | |
| 5 | Jakub Jelinek <jj@ultra.linux.cz>. | |
| 6 | ||
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 8 | modify it under the terms of the GNU Lesser General Public | |
| 9 | License as published by the Free Software Foundation; either | |
| 10 | version 2.1 of the License, or (at your option) any later version. | |
| 11 | ||
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | Lesser General Public License for more details. | |
| 16 | ||
| 17 | You should have received a copy of the GNU Lesser General Public | |
| 18 | License along with the GNU C Library; if not, write to the Free | |
| 19 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 20 | 02111-1307 USA. */ | |
| 21 | ||
| 22 | #include <math.h> | |
| 23 | ||
| 24 | #include "math_private.h" | |
| 25 | #include <math_ldbl_opt.h> | |
| 26 | ||
| 27 | void | |
| 28 | __sincosl (long double x, long double *sinx, long double *cosx) | |
| 29 | { | |
| 30 | int64_t ix; | |
| 31 | ||
| 32 | /* High word of x. */ | |
| 33 | GET_LDOUBLE_MSW64 (ix, x); | |
| 34 | ||
| 35 | /* |x| ~< pi/4 */ | |
| 36 | ix &= 0x7fffffffffffffffLL; | |
| 37 | if (ix <= 0x3fe921fb54442d10LL) | |
| 38 | __kernel_sincosl (x, 0.0L, sinx, cosx, 0); | |
| 39 | else if (ix >= 0x7ff0000000000000LL) | |
| 40 | { | |
| 41 | /* sin(Inf or NaN) is NaN */ | |
| 42 | *sinx = *cosx = x - x; | |
| 43 | } | |
| 44 | else | |
| 45 | { | |
| 46 | /* Argument reduction needed. */ | |
| 47 | long double y[2]; | |
| 48 | int n; | |
| 49 | ||
| 50 | n = __ieee754_rem_pio2l (x, y); | |
| 51 | switch (n & 3) | |
| 52 | { | |
| 53 | case 0: | |
| 54 | __kernel_sincosl (y[0], y[1], sinx, cosx, 1); | |
| 55 | break; | |
| 56 | case 1: | |
| 57 | __kernel_sincosl (y[0], y[1], cosx, sinx, 1); | |
| 58 | *cosx = -*cosx; | |
| 59 | break; | |
| 60 | case 2: | |
| 61 | __kernel_sincosl (y[0], y[1], sinx, cosx, 1); | |
| 62 | *sinx = -*sinx; | |
| 63 | *cosx = -*cosx; | |
| 64 | break; | |
| 65 | default: | |
| 66 | __kernel_sincosl (y[0], y[1], cosx, sinx, 1); | |
| 67 | *sinx = -*sinx; | |
| 68 | break; | |
| 69 | } | |
| 70 | } | |
| 71 | } | |
| 72 | long_double_symbol (libm, __sincosl, sincosl); |