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d4697bc9 | 1 | /* Copyright (C) 2012-2014 Free Software Foundation, Inc. |
d8b82cad JM |
2 | This file is part of the GNU C Library. |
3 | ||
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. | |
8 | ||
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. | |
13 | ||
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 | <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <math.h> | |
19 | #include <math_private.h> | |
20 | #include <float.h> | |
21 | ||
22 | static const double log10_high = 0x2.4d7637p0; | |
23 | static const double log10_low = 0x7.6aaa2b05ba95cp-28; | |
24 | ||
25 | double | |
26 | __ieee754_exp10 (double arg) | |
27 | { | |
28 | int32_t lx; | |
29 | double arg_high, arg_low; | |
30 | double exp_high, exp_low; | |
31 | ||
32 | if (!__finite (arg)) | |
33 | return __ieee754_exp (arg); | |
34 | if (arg < DBL_MIN_10_EXP - DBL_DIG - 10) | |
35 | return DBL_MIN * DBL_MIN; | |
36 | else if (arg > DBL_MAX_10_EXP + 1) | |
37 | return DBL_MAX * DBL_MAX; | |
38 | ||
39 | GET_LOW_WORD (lx, arg); | |
40 | lx &= 0xf8000000; | |
41 | arg_high = arg; | |
42 | SET_LOW_WORD (arg_high, lx); | |
43 | arg_low = arg - arg_high; | |
44 | exp_high = arg_high * log10_high; | |
45 | exp_low = arg_high * log10_low + arg_low * M_LN10; | |
46 | return __ieee754_exp (exp_high) * __ieee754_exp (exp_low); | |
47 | } | |
48 | strong_alias (__ieee754_exp10, __exp10_finite) |