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 <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 long double
27__attribute__ ((noinline))
28sysv_scalbl (long double x, long double fn)
29{
30 long double z = __ieee754_scalbl (x, fn);
31
32 if (__glibc_unlikely (isinf (z)))
33 {
34 if (isfinite (x))
35 return __kernel_standard_l (x, fn, 232); /* scalb overflow */
36 else
37 __set_errno (ERANGE);
38 }
39 else if (__builtin_expect (z == 0.0L, 0) && z != x)
40 return __kernel_standard_l (x, fn, 233); /* scalb underflow */
41
42 return z;
43}
44
45
46/* Wrapper scalbl */
47long double
48__scalbl (long double x, long double fn)
49{
50 if (__glibc_unlikely (_LIB_VERSION == _SVID_))
51 return sysv_scalbl (x, fn);
52 else
53 {
54 long double z = __ieee754_scalbl (x, fn);
55
56 if (__glibc_unlikely (!isfinite (z) || z == 0.0L))
57 {
58 if (isnan (z))
59 {
60 if (!isnan (x) && !isnan (fn))
61 __set_errno (EDOM);
62 }
63 else if (isinf (z))
64 {
65 if (!isinf (x) && !isinf (fn))
66 __set_errno (ERANGE);
67 }
68 else
69 {
70 /* z == 0. */
71 if (x != 0.0L && !isinf (fn))
72 __set_errno (ERANGE);
73 }
74 }
75 return z;
76 }
77}
78weak_alias (__scalbl, scalbl)
79#endif
80