1/* Copyright (C) 2011-2018 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 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <math.h>
21#include <math_private.h>
22#include <math-svid-compat.h>
23
24
25#if LIBM_SVID_COMPAT
26static float
27__attribute__ ((noinline))
28sysv_scalbf (float x, float fn)
29{
30 float z = __ieee754_scalbf (x, fn);
31
32 if (__glibc_unlikely (isinf (z)))
33 {
34 if (isfinite (x))
35 return __kernel_standard_f (x, fn, 132); /* scalb overflow */
36 else
37 __set_errno (ERANGE);
38 }
39 else if (__builtin_expect (z == 0.0f, 0) && z != x)
40 return __kernel_standard_f (x, fn, 133); /* scalb underflow */
41
42 return z;
43}
44#endif
45
46
47/* Wrapper scalbf */
48float
49__scalbf (float x, float fn)
50{
51#if LIBM_SVID_COMPAT
52 if (__glibc_unlikely (_LIB_VERSION == _SVID_))
53 return sysv_scalbf (x, fn);
54 else
55#endif
56 {
57 float z = __ieee754_scalbf (x, fn);
58
59 if (__glibc_unlikely (!isfinite (z) || z == 0.0f))
60 {
61 if (isnan (z))
62 {
63 if (!isnan (x) && !isnan (fn))
64 __set_errno (EDOM);
65 }
66 else if (isinf (z))
67 {
68 if (!isinf (x) && !isinf (fn))
69 __set_errno (ERANGE);
70 }
71 else
72 {
73 /* z == 0. */
74 if (x != 0.0f && !isinf (fn))
75 __set_errno (ERANGE);
76 }
77 }
78 return z;
79 }
80}
81weak_alias (__scalbf, scalbf)
82