mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
394d998315
At least in neovim, `│vi:` is not recognized as a modeline because it has no preceding whitespace. After fixing this, opening a file yields an error because `net` is not an option. (`noet`, however, is.)
54 lines
3.3 KiB
C
54 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
|
||
│ vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi │
|
||
╚──────────────────────────────────────────────────────────────────────────────╝
|
||
│ │
|
||
│ Musl Libc │
|
||
│ Copyright © 2005-2014 Rich Felker, et al. │
|
||
│ │
|
||
│ Permission is hereby granted, free of charge, to any person obtaining │
|
||
│ a copy of this software and associated documentation files (the │
|
||
│ "Software"), to deal in the Software without restriction, including │
|
||
│ without limitation the rights to use, copy, modify, merge, publish, │
|
||
│ distribute, sublicense, and/or sell copies of the Software, and to │
|
||
│ permit persons to whom the Software is furnished to do so, subject to │
|
||
│ the following conditions: │
|
||
│ │
|
||
│ The above copyright notice and this permission notice shall be │
|
||
│ included in all copies or substantial portions of the Software. │
|
||
│ │
|
||
│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
|
||
│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
|
||
│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
|
||
│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
|
||
│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
|
||
│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
|
||
│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
|
||
│ │
|
||
╚─────────────────────────────────────────────────────────────────────────────*/
|
||
#include "libc/math.h"
|
||
|
||
asm(".ident\t\"\\n\\n\
|
||
Musl libc (MIT License)\\n\
|
||
Copyright 2005-2014 Rich Felker, et. al.\"");
|
||
asm(".include \"libc/disclaimer.inc\"");
|
||
/* clang-format off */
|
||
|
||
/**
|
||
* Returns inverse hyperbolic cosine of 𝑥.
|
||
* @define acosh(x) = log(x + sqrt(x*x-1))
|
||
*/
|
||
float acoshf(float x)
|
||
{
|
||
union {float f; uint32_t i;} u = {x};
|
||
uint32_t a = u.i & 0x7fffffff;
|
||
|
||
if (a < 0x3f800000+(1<<23))
|
||
/* |x| < 2, invalid if x < 1 */
|
||
/* up to 2ulp error in [1,1.125] */
|
||
return log1pf(x-1 + sqrtf((x-1)*(x-1)+2*(x-1)));
|
||
if (u.i < 0x3f800000+(12<<23))
|
||
/* 2 <= x < 0x1p12 */
|
||
return logf(2*x - 1/(x+sqrtf(x*x-1)));
|
||
/* x >= 0x1p12 or x <= -2 or nan */
|
||
return logf(x) + 0.693147180559945309417232121458176568f;
|
||
}
|