mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 19:51:11 +00:00
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* Copyright (C) 2012-2016 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 double log10_high = 0x2.4d7637p0;
|
|
static const double log10_low = 0x7.6aaa2b05ba95cp-28;
|
|
|
|
double
|
|
__ieee754_exp10 (double arg)
|
|
{
|
|
int32_t lx;
|
|
double arg_high, arg_low;
|
|
double exp_high, exp_low;
|
|
|
|
if (!isfinite (arg))
|
|
return __ieee754_exp (arg);
|
|
if (arg < DBL_MIN_10_EXP - DBL_DIG - 10)
|
|
return DBL_MIN * DBL_MIN;
|
|
else if (arg > DBL_MAX_10_EXP + 1)
|
|
return DBL_MAX * DBL_MAX;
|
|
else if (fabs (arg) < 0x1p-56)
|
|
return 1.0;
|
|
|
|
GET_LOW_WORD (lx, arg);
|
|
lx &= 0xf8000000;
|
|
arg_high = arg;
|
|
SET_LOW_WORD (arg_high, lx);
|
|
arg_low = arg - arg_high;
|
|
exp_high = arg_high * log10_high;
|
|
exp_low = arg_high * log10_low + arg_low * M_LN10;
|
|
return __ieee754_exp (exp_high) * __ieee754_exp (exp_low);
|
|
}
|
|
strong_alias (__ieee754_exp10, __exp10_finite)
|