1 /* Copyright (C) 2012-2021 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 long double log10_high
= 0x2.4d763776aaap
+0L;
24 static const long double log10_low
= 0x2.b05ba95b58ae0b4c28a38a3fb4p
-48L;
27 __ieee754_exp10l (long double arg
)
29 union ibm_extended_long_double u
;
30 long double arg_high
, arg_low
;
31 long double exp_high
, exp_low
;
34 return __ieee754_expl (arg
);
35 if (arg
< LDBL_MIN_10_EXP
- LDBL_DIG
- 10)
36 return LDBL_MIN
* LDBL_MIN
;
37 else if (arg
> LDBL_MAX_10_EXP
+ 1)
38 return LDBL_MAX
* LDBL_MAX
;
39 else if (fabsl (arg
) < 0x1p
-109L)
45 exp_high
= arg_high
* log10_high
;
46 exp_low
= arg_high
* log10_low
+ arg_low
* M_LN10l
;
47 return __ieee754_expl (exp_high
) * __ieee754_expl (exp_low
);
49 libm_alias_finite (__ieee754_exp10l
, __exp10l
)