mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* Copyright (C) 2012 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <float.h>
|
|
|
|
static const long double log10_high = 0x2.4d763776aaa2cp0L;
|
|
static const long double log10_low = -0xf.a456a4a751f4b3d75c75c04c18p-56L;
|
|
|
|
long double
|
|
__ieee754_exp10l (long double arg)
|
|
{
|
|
union ibm_extended_long_double u;
|
|
long double arg_high, arg_low;
|
|
long double exp_high, exp_low;
|
|
|
|
if (!__finitel (arg))
|
|
return __ieee754_expl (arg);
|
|
if (arg < LDBL_MIN_10_EXP - LDBL_DIG - 10)
|
|
return LDBL_MIN * LDBL_MIN;
|
|
else if (arg > LDBL_MAX_10_EXP + 1)
|
|
return LDBL_MAX * LDBL_MAX;
|
|
|
|
u.d = arg;
|
|
arg_high = u.dd[0];
|
|
arg_low = u.dd[1];
|
|
exp_high = arg_high * log10_high;
|
|
exp_low = arg_high * log10_low + arg_low * M_LN10l;
|
|
return __ieee754_expl (exp_high) * __ieee754_expl (exp_low);
|
|
}
|
|
strong_alias (__ieee754_exp10l, __exp10l_finite)
|