2021-08-16 22:26:31 +00:00
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/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
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╚──────────────────────────────────────────────────────────────────────────────╝
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2021-02-28 09:06:00 +00:00
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│ │
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2021-08-16 22:26:31 +00:00
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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2021-02-28 09:06:00 +00:00
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/math.h"
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2021-08-16 22:26:31 +00:00
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#include "libc/tinymath/expo.internal.h"
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#include "libc/tinymath/ldshape.internal.h"
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asm(".ident\t\"\\n\\n\
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Musl libc (MIT License)\\n\
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Copyright 2005-2014 Rich Felker, et. al.\"");
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asm(".include \"libc/disclaimer.inc\"");
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/* clang-format off */
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2021-02-28 09:06:00 +00:00
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/**
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* Returns hyperbolic sine of 𝑥.
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2022-07-21 03:31:16 +00:00
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*
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2021-08-16 22:26:31 +00:00
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* sinh(x) = (exp(x) - 1/exp(x))/2
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* = (exp(x)-1 + (exp(x)-1)/exp(x))/2
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* = x + x^3/6 + o(x^5)
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2021-02-28 09:06:00 +00:00
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*/
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2021-08-16 22:26:31 +00:00
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long double sinhl(long double x)
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{
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union ldshape u = {x};
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unsigned ex = u.i.se & 0x7fff;
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long double h, t, absx;
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h = 0.5;
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if (u.i.se & 0x8000)
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h = -h;
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/* |x| */
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u.i.se = ex;
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absx = u.f;
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/* |x| < log(LDBL_MAX) */
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if (ex < 0x3fff+13 || (ex == 0x3fff+13 && u.i.m>>32 < 0xb17217f7)) {
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t = expm1l(absx);
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if (ex < 0x3fff) {
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if (ex < 0x3fff-32)
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return x;
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return h*(2*t - t*t/(1+t));
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}
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return h*(t + t/(t+1));
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}
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/* |x| > log(LDBL_MAX) or nan */
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t = expl(0.5*absx);
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return h*t*t;
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2021-02-28 09:06:00 +00:00
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}
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