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2b778ceb | 1 | /* Copyright (C) 2011-2021 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 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
f7eac6eb | 18 | |
9d13fb24 | 19 | #include <math.h> |
9277c064 | 20 | #include <math_private.h> |
813378e9 | 21 | #include <math-svid-compat.h> |
5bcdb315 | 22 | #include <libm-alias-float.h> |
f7eac6eb RM |
23 | |
24 | ||
72d3d281 | 25 | #if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_27) |
0ac5ae23 UD |
26 | /* wrapper powf */ |
27 | float | |
72d3d281 | 28 | __powf_compat (float x, float y) |
f7eac6eb | 29 | { |
0ac5ae23 | 30 | float z = __ieee754_powf (x, y); |
d81f90cc | 31 | if (__glibc_unlikely (!isfinite (z))) |
0ac5ae23 UD |
32 | { |
33 | if (_LIB_VERSION != _IEEE_) | |
34 | { | |
72d839a4 | 35 | if (isfinite (x) && isfinite (y)) |
0ac5ae23 | 36 | { |
d81f90cc | 37 | if (isnan (z)) |
0ac5ae23 UD |
38 | /* pow neg**non-int */ |
39 | return __kernel_standard_f (x, y, 124); | |
40 | else if (x == 0.0f && y < 0.0f) | |
41 | { | |
42 | if (signbit (x) && signbit (z)) | |
43 | /* pow(-0.0,negative) */ | |
44 | return __kernel_standard_f (x, y, 123); | |
45 | else | |
46 | /* pow(+0.0,negative) */ | |
47 | return __kernel_standard_f (x, y, 143); | |
48 | } | |
0d8733c4 | 49 | else |
0ac5ae23 UD |
50 | /* pow overflow */ |
51 | return __kernel_standard_f (x, y, 121); | |
7ef90c15 | 52 | } |
f7eac6eb | 53 | } |
0ac5ae23 | 54 | } |
72d839a4 JM |
55 | else if (__builtin_expect (z == 0.0f, 0) |
56 | && isfinite (x) && x != 0 && isfinite (y) | |
0ac5ae23 | 57 | && _LIB_VERSION != _IEEE_) |
72d839a4 JM |
58 | /* pow underflow */ |
59 | return __kernel_standard_f (x, y, 122); | |
0ac5ae23 UD |
60 | |
61 | return z; | |
f7eac6eb | 62 | } |
72d3d281 | 63 | compat_symbol (libm, __powf_compat, powf, GLIBC_2_0); |
4f3647e4 | 64 | #endif |