]>
Commit | Line | Data |
---|---|---|
1 | /* Copyright (C) 2011-2021 Free Software Foundation, Inc. | |
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 | <https://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <math.h> | |
19 | #include <math_private.h> | |
20 | #include <math-svid-compat.h> | |
21 | #include <libm-alias-double.h> | |
22 | ||
23 | ||
24 | #if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29) \ | |
25 | || defined NO_LONG_DOUBLE \ | |
26 | || defined LONG_DOUBLE_COMPAT) | |
27 | /* wrapper pow */ | |
28 | double | |
29 | __pow_compat (double x, double y) | |
30 | { | |
31 | double z = __ieee754_pow (x, y); | |
32 | if (__glibc_unlikely (!isfinite (z))) | |
33 | { | |
34 | if (_LIB_VERSION != _IEEE_) | |
35 | { | |
36 | if (isfinite (x) && isfinite (y)) | |
37 | { | |
38 | if (isnan (z)) | |
39 | /* pow neg**non-int */ | |
40 | return __kernel_standard (x, y, 24); | |
41 | else if (x == 0.0 && y < 0.0) | |
42 | { | |
43 | if (signbit (x) && signbit (z)) | |
44 | /* pow(-0.0,negative) */ | |
45 | return __kernel_standard (x, y, 23); | |
46 | else | |
47 | /* pow(+0.0,negative) */ | |
48 | return __kernel_standard (x, y, 43); | |
49 | } | |
50 | else | |
51 | /* pow overflow */ | |
52 | return __kernel_standard (x, y, 21); | |
53 | } | |
54 | } | |
55 | } | |
56 | else if (__builtin_expect (z == 0.0, 0) | |
57 | && isfinite (x) && x != 0 && isfinite (y) | |
58 | && _LIB_VERSION != _IEEE_) | |
59 | /* pow underflow */ | |
60 | return __kernel_standard (x, y, 22); | |
61 | ||
62 | return z; | |
63 | } | |
64 | # if SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_29) | |
65 | compat_symbol (libm, __pow_compat, pow, GLIBC_2_0); | |
66 | # endif | |
67 | # ifdef NO_LONG_DOUBLE | |
68 | weak_alias (__pow_compat, powl) | |
69 | # endif | |
70 | # ifdef LONG_DOUBLE_COMPAT | |
71 | /* Work around gas bug "multiple versions for symbol". */ | |
72 | weak_alias (__pow_compat, __pow_compat_alias) | |
73 | ||
74 | LONG_DOUBLE_COMPAT_CHOOSE_libm_powl ( | |
75 | compat_symbol (libm, __pow_compat_alias, powl, FIRST_VERSION_libm_powl), ); | |
76 | # endif | |
77 | #endif |