| /* k_sinf.c -- float version of k_sin.c |
| Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011 |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If |
| not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include <math.h> |
| #include <fenv.h> |
| #include <math_private.h> |
| |
| |
| static const float twom27 = 7.4505806000e-09; |
| static const float half = 5.0000000000e-01; |
| static const float S1 = -1.6666667163e-01; |
| static const float S2 = 8.3333337680e-03; |
| static const float S3 = -1.9841270114e-04; |
| static const float S4 = 2.7557314297e-06; |
| static const float S5 = -2.5050759689e-08; |
| static const float S6 = 1.5896910177e-10; |
| |
| |
| float |
| __kernel_sinf (float x, float y, int iy) |
| { |
| float z, r, v; |
| float ix; |
| ix = __builtin_fabsf (x); |
| if (ix < twom27) |
| { /* |x| < 2**-27 */ |
| __feraiseexcept (FE_INEXACT); |
| return x; |
| } |
| z = x * x; |
| v = z * x; |
| r = S2 + z * (S3 + z * (S4 + z * (S5 + z * S6))); |
| if (iy == 0) |
| return x + v * (S1 + z * r); |
| else |
| return x - ((z * (half * y - v * r) - y) - v * S1); |
| } |
