mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
2fc507c98f
* modelines: tw -> sw shiftwidth, not textwidth. * space-surround modelines * fix irregular modelines * Fix modeline in titlegen.c
69 lines
3.6 KiB
C
69 lines
3.6 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
|
|
╚──────────────────────────────────────────────────────────────────────────────╝
|
|
│ │
|
|
│ Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG> │
|
|
│ All rights reserved. │
|
|
│ │
|
|
│ Redistribution and use in source and binary forms, with or without │
|
|
│ modification, are permitted provided that the following conditions │
|
|
│ are met: │
|
|
│ 1. Redistributions of source code must retain the above copyright │
|
|
│ notice, this list of conditions and the following disclaimer. │
|
|
│ 2. Redistributions in binary form must reproduce the above copyright │
|
|
│ notice, this list of conditions and the following disclaimer in the │
|
|
│ documentation and/or other materials provided with the distribution. │
|
|
│ │
|
|
│ THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND │
|
|
│ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE │
|
|
│ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE │
|
|
│ ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE │
|
|
│ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL │
|
|
│ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS │
|
|
│ OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) │
|
|
│ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT │
|
|
│ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY │
|
|
│ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF │
|
|
│ SUCH DAMAGE. │
|
|
│ │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/math.h"
|
|
#include "libc/tinymath/freebsd.internal.h"
|
|
#if !(LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024)
|
|
|
|
asm(".ident\t\"\\n\\n\
|
|
FreeBSD libm (BSD-2 License)\\n\
|
|
Copyright (c) 2005-2011, Bruce D. Evans, Steven G. Kargl, David Schultz.\"");
|
|
asm(".include \"libc/disclaimer.inc\"");
|
|
// clang-format off
|
|
|
|
/**
|
|
* Splits number normalized fraction and exponent.
|
|
*/
|
|
long double
|
|
frexpl(long double x, int *ex)
|
|
{
|
|
union IEEEl2bits u;
|
|
|
|
u.e = x;
|
|
switch (u.bits.exp) {
|
|
case 0: /* 0 or subnormal */
|
|
if ((u.bits.manl | u.bits.manh) == 0) {
|
|
*ex = 0;
|
|
} else {
|
|
u.e *= 0x1.0p514;
|
|
*ex = u.bits.exp - 0x4200;
|
|
u.bits.exp = 0x3ffe;
|
|
}
|
|
break;
|
|
case 0x7fff: /* infinity or NaN; value of *ex is unspecified */
|
|
break;
|
|
default: /* normal */
|
|
*ex = u.bits.exp - 0x3ffe;
|
|
u.bits.exp = 0x3ffe;
|
|
break;
|
|
}
|
|
return (u.e);
|
|
}
|
|
|
|
#endif /* long double is long */
|