1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/* Copyright (C) 2011-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <math.h>
#include <math_private.h>
#include <math-svid-compat.h>
#if LIBM_SVID_COMPAT
static long double
__attribute__ ((noinline))
sysv_scalbl (long double x, long double fn)
{
long double z = __ieee754_scalbl (x, fn);
if (__glibc_unlikely (isinf (z)))
{
if (isfinite (x))
return __kernel_standard_l (x, fn, 232); /* scalb overflow */
else
__set_errno (ERANGE);
}
else if (__builtin_expect (z == 0.0L, 0) && z != x)
return __kernel_standard_l (x, fn, 233); /* scalb underflow */
return z;
}
/* Wrapper scalbl */
long double
__scalbl (long double x, long double fn)
{
if (__glibc_unlikely (_LIB_VERSION == _SVID_))
return sysv_scalbl (x, fn);
else
{
long double z = __ieee754_scalbl (x, fn);
if (__glibc_unlikely (!isfinite (z) || z == 0.0L))
{
if (isnan (z))
{
if (!isnan (x) && !isnan (fn))
__set_errno (EDOM);
}
else if (isinf (z))
{
if (!isinf (x) && !isinf (fn))
__set_errno (ERANGE);
}
else
{
/* z == 0. */
if (x != 0.0L && !isinf (fn))
__set_errno (ERANGE);
}
}
return z;
}
}
weak_alias (__scalbl, scalbl)
#endif
|
