1 /* Copyright (C) 2012-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
19 #include <math_private.h>
21 #include <libm-alias-finite.h>
23 static const double log10_high
= 0x2.4d7637p0
;
24 static const double log10_low
= 0x7.6aaa2b05ba95cp
-28;
27 __ieee754_exp10 (double arg
)
30 double arg_high
, arg_low
;
31 double exp_high
, exp_low
;
34 return __ieee754_exp (arg
);
35 if (arg
< DBL_MIN_10_EXP
- DBL_DIG
- 10)
36 return DBL_MIN
* DBL_MIN
;
37 else if (arg
> DBL_MAX_10_EXP
+ 1)
38 return DBL_MAX
* DBL_MAX
;
39 else if (fabs (arg
) < 0x1p
-56)
42 GET_LOW_WORD (lx
, arg
);
45 SET_LOW_WORD (arg_high
, lx
);
46 arg_low
= arg
- arg_high
;
47 exp_high
= arg_high
* log10_high
;
48 exp_low
= arg_high
* log10_low
+ arg_low
* M_LN10
;
49 return __ieee754_exp (exp_high
) * __ieee754_exp (exp_low
);
51 libm_alias_finite (__ieee754_exp10
, __exp10
)