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bfff8b1b | 1 | /* Copyright (C) 2011-2017 Free Software Foundation, Inc. |
0ac5ae23 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. | |
f7eac6eb | 4 | |
0ac5ae23 UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
f7eac6eb | 9 | |
0ac5ae23 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
f7eac6eb | 14 | |
0ac5ae23 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
f7eac6eb | 18 | |
9d13fb24 | 19 | #include <math.h> |
9277c064 | 20 | #include <math_private.h> |
f7eac6eb RM |
21 | |
22 | ||
0ac5ae23 UD |
23 | /* wrapper pow */ |
24 | double | |
25 | __pow (double x, double y) | |
f7eac6eb | 26 | { |
0ac5ae23 | 27 | double z = __ieee754_pow (x, y); |
d81f90cc | 28 | if (__glibc_unlikely (!isfinite (z))) |
0ac5ae23 UD |
29 | { |
30 | if (_LIB_VERSION != _IEEE_) | |
31 | { | |
72d839a4 | 32 | if (isfinite (x) && isfinite (y)) |
0ac5ae23 | 33 | { |
d81f90cc | 34 | if (isnan (z)) |
0ac5ae23 UD |
35 | /* pow neg**non-int */ |
36 | return __kernel_standard (x, y, 24); | |
37 | else if (x == 0.0 && y < 0.0) | |
38 | { | |
39 | if (signbit (x) && signbit (z)) | |
40 | /* pow(-0.0,negative) */ | |
41 | return __kernel_standard (x, y, 23); | |
42 | else | |
43 | /* pow(+0.0,negative) */ | |
44 | return __kernel_standard (x, y, 43); | |
45 | } | |
0d8733c4 | 46 | else |
0ac5ae23 UD |
47 | /* pow overflow */ |
48 | return __kernel_standard (x, y, 21); | |
7ef90c15 | 49 | } |
f7eac6eb | 50 | } |
0ac5ae23 | 51 | } |
72d839a4 JM |
52 | else if (__builtin_expect (z == 0.0, 0) |
53 | && isfinite (x) && x != 0 && isfinite (y) | |
0ac5ae23 | 54 | && _LIB_VERSION != _IEEE_) |
72d839a4 JM |
55 | /* pow underflow */ |
56 | return __kernel_standard (x, y, 22); | |
0ac5ae23 UD |
57 | |
58 | return z; | |
f7eac6eb RM |
59 | } |
60 | weak_alias (__pow, pow) | |
cccda09f UD |
61 | #ifdef NO_LONG_DOUBLE |
62 | strong_alias (__pow, __powl) | |
63 | weak_alias (__pow, powl) | |
64 | #endif |