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b168057a | 1 | /* Copyright (C) 2011-2015 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. | |
f7eac6eb | 4 | |
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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 | |
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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> |
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21 | |
22 | ||
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23 | /* wrapper powf */ |
24 | float | |
25 | __powf (float x, float y) | |
f7eac6eb | 26 | { |
0ac5ae23 | 27 | float z = __ieee754_powf (x, y); |
a1ffb40e | 28 | if (__glibc_unlikely (!__finitef (z))) |
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29 | { |
30 | if (_LIB_VERSION != _IEEE_) | |
31 | { | |
32 | if (__isnanf (x)) | |
33 | { | |
34 | if (y == 0.0f) | |
35 | /* pow(NaN,0.0) */ | |
36 | return __kernel_standard_f (x, y, 142); | |
37 | } | |
38 | else if (__finitef (x) && __finitef (y)) | |
39 | { | |
40 | if (__isnanf (z)) | |
41 | /* pow neg**non-int */ | |
42 | return __kernel_standard_f (x, y, 124); | |
43 | else if (x == 0.0f && y < 0.0f) | |
44 | { | |
45 | if (signbit (x) && signbit (z)) | |
46 | /* pow(-0.0,negative) */ | |
47 | return __kernel_standard_f (x, y, 123); | |
48 | else | |
49 | /* pow(+0.0,negative) */ | |
50 | return __kernel_standard_f (x, y, 143); | |
51 | } | |
0d8733c4 | 52 | else |
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53 | /* pow overflow */ |
54 | return __kernel_standard_f (x, y, 121); | |
7ef90c15 | 55 | } |
f7eac6eb | 56 | } |
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57 | } |
58 | else if (__builtin_expect (z == 0.0f, 0) && __finitef (x) && __finitef (y) | |
59 | && _LIB_VERSION != _IEEE_) | |
60 | { | |
61 | if (x == 0.0f) | |
62 | { | |
63 | if (y == 0.0f) | |
64 | /* pow(0.0,0.0) */ | |
65 | return __kernel_standard_f (x, y, 120); | |
0d8733c4 | 66 | } |
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67 | else |
68 | /* pow underflow */ | |
69 | return __kernel_standard_f (x, y, 122); | |
70 | } | |
71 | ||
72 | return z; | |
f7eac6eb RM |
73 | } |
74 | weak_alias (__powf, powf) |