projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 long double log10_high = 0x2.4d763776aaa2bp0L; | |
| 23 | static const long double log10_low = 0x5.ba95b58ae0b4c28a38a3fb3e7698p-60L; | |
| 24 | ||
| 25 | long double | |
| 26 | __ieee754_exp10l (long double arg) | |
| 27 | { | |
| 28 | ieee854_long_double_shape_type u; | |
| 29 | long double arg_high, arg_low; | |
| 30 | long double exp_high, exp_low; | |
| 31 | ||
| 32 | if (!__finitel (arg)) | |
| 33 | return __ieee754_expl (arg); | |
| 34 | if (arg < LDBL_MIN_10_EXP - LDBL_DIG - 10) | |
| 35 | return LDBL_MIN * LDBL_MIN; | |
| 36 | else if (arg > LDBL_MAX_10_EXP + 1) | |
| 37 | return LDBL_MAX * LDBL_MAX; | |
| 38 | ||
| 39 | u.value = arg; | |
| 40 | u.parts64.lsw &= 0xfe00000000000000LL; | |
| 41 | arg_high = u.value; | |
| 42 | arg_low = arg - arg_high; | |
| 43 | exp_high = arg_high * log10_high; | |
| 44 | exp_low = arg_high * log10_low + arg_low * M_LN10l; | |
| 45 | return __ieee754_expl (exp_high) * __ieee754_expl (exp_low); | |
| 46 | } | |
| 47 | strong_alias (__ieee754_exp10l, __exp10l_finite) |