1/* Copyright (C) 2011-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
4
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.
9
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
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <math.h>
20#include <math_private.h>
21#include <math-svid-compat.h>
22#include <libm-alias-float.h>
23
24
25#if LIBM_SVID_COMPAT && SHLIB_COMPAT (libm, GLIBC_2_0, GLIBC_2_27)
26/* wrapper powf */
27float
28__powf_compat (float x, float y)
29{
30 float z = __ieee754_powf (x, y);
31 if (__glibc_unlikely (!isfinite (z)))
32 {
33 if (_LIB_VERSION != _IEEE_)
34 {
35 if (isfinite (x) && isfinite (y))
36 {
37 if (isnan (z))
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 }
49 else
50 /* pow overflow */
51 return __kernel_standard_f (x, y, 121);
52 }
53 }
54 }
55 else if (__builtin_expect (z == 0.0f, 0)
56 && isfinite (x) && x != 0 && isfinite (y)
57 && _LIB_VERSION != _IEEE_)
58 /* pow underflow */
59 return __kernel_standard_f (x, y, 122);
60
61 return z;
62}
63compat_symbol (libm, __powf_compat, powf, GLIBC_2_0);
64#endif
65