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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. | |
ee188d55 | 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. | |
ee188d55 | 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. | |
14 | ||
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/>. */ | |
ee188d55 | 18 | |
9d13fb24 | 19 | #include <math.h> |
9277c064 | 20 | #include <math_private.h> |
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21 | |
22 | ||
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23 | /* wrapper powl */ |
24 | long double | |
25 | __powl (long double x, long double y) | |
ee188d55 | 26 | { |
0ac5ae23 | 27 | long double z = __ieee754_powl (x, y); |
d81f90cc | 28 | if (__glibc_unlikely (!isfinite (z))) |
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29 | { |
30 | if (_LIB_VERSION != _IEEE_) | |
31 | { | |
d81f90cc | 32 | if (isnan (x)) |
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33 | { |
34 | if (y == 0.0L) | |
35 | /* pow(NaN,0.0) */ | |
41bf21a1 | 36 | return __kernel_standard_l (x, y, 242); |
0ac5ae23 | 37 | } |
d81f90cc | 38 | else if (isfinite (x) && isfinite (y)) |
0ac5ae23 | 39 | { |
d81f90cc | 40 | if (isnan (z)) |
0ac5ae23 | 41 | /* pow neg**non-int */ |
41bf21a1 | 42 | return __kernel_standard_l (x, y, 224); |
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43 | else if (x == 0.0L && y < 0.0L) |
44 | { | |
45 | if (signbit (x) && signbit (z)) | |
46 | /* pow(-0.0,negative) */ | |
41bf21a1 | 47 | return __kernel_standard_l (x, y, 223); |
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48 | else |
49 | /* pow(+0.0,negative) */ | |
41bf21a1 | 50 | return __kernel_standard_l (x, y, 243); |
0ac5ae23 | 51 | } |
0d8733c4 | 52 | else |
0ac5ae23 | 53 | /* pow overflow */ |
41bf21a1 | 54 | return __kernel_standard_l (x, y, 221); |
7ef90c15 | 55 | } |
ee188d55 | 56 | } |
0ac5ae23 | 57 | } |
d81f90cc | 58 | else if (__builtin_expect (z == 0.0L, 0) && isfinite (x) && isfinite (y) |
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59 | && _LIB_VERSION != _IEEE_) |
60 | { | |
61 | if (x == 0.0L) | |
62 | { | |
63 | if (y == 0.0L) | |
64 | /* pow(0.0,0.0) */ | |
41bf21a1 | 65 | return __kernel_standard_l (x, y, 220); |
ee188d55 | 66 | } |
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67 | else |
68 | /* pow underflow */ | |
41bf21a1 | 69 | return __kernel_standard_l (x, y, 222); |
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70 | } |
71 | ||
72 | return z; | |
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73 | } |
74 | weak_alias (__powl, powl) |