| Elliott Hughes | 99ef447 | 2022-01-12 17:51:20 -0800 | [diff] [blame^] | 1 | /*- |
| 2 | * Copyright (c) 2017 Steven G. Kargl |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice unmodified, this list of conditions, and the following |
| 10 | * disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | /* |
| 28 | * The basic kernel for x in [0,0.25]. To use the kernel for sin(x), the |
| 29 | * argument to __kernel_sinpi() must be multiplied by pi. |
| 30 | */ |
| 31 | |
| 32 | static inline double |
| 33 | __kernel_sinpi(double x) |
| 34 | { |
| 35 | double_t hi, lo; |
| 36 | |
| 37 | hi = (float)x; |
| 38 | lo = x - hi; |
| 39 | lo = lo * (pi_lo + pi_hi) + hi * pi_lo; |
| 40 | hi *= pi_hi; |
| 41 | _2sumF(hi, lo); |
| 42 | return (__kernel_sin(hi, lo, 1)); |
| 43 | } |