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2b778ceb | 1 | /* Copyright (C) 2011-2021 Free Software Foundation, Inc. |
0ac5ae23 | 2 | This file is part of the GNU C Library. |
f7eac6eb | 3 | |
0ac5ae23 UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
f7eac6eb | 13 | |
0ac5ae23 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
f7eac6eb | 17 | |
0ac5ae23 | 18 | #include <errno.h> |
9d13fb24 | 19 | #include <math.h> |
9277c064 | 20 | #include <math_private.h> |
813378e9 | 21 | #include <math-svid-compat.h> |
f7eac6eb | 22 | |
f7eac6eb | 23 | |
4f3647e4 | 24 | #if LIBM_SVID_COMPAT |
0ac5ae23 UD |
25 | static double |
26 | __attribute__ ((noinline)) | |
27 | sysv_scalb (double x, double fn) | |
f7eac6eb | 28 | { |
0ac5ae23 UD |
29 | double z = __ieee754_scalb (x, fn); |
30 | ||
d81f90cc | 31 | if (__glibc_unlikely (isinf (z))) |
0ac5ae23 | 32 | { |
d81f90cc | 33 | if (isfinite (x)) |
0ac5ae23 UD |
34 | return __kernel_standard (x, fn, 32); /* scalb overflow */ |
35 | else | |
36 | __set_errno (ERANGE); | |
37 | } | |
38 | else if (__builtin_expect (z == 0.0, 0) && z != x) | |
39 | return __kernel_standard (x, fn, 33); /* scalb underflow */ | |
40 | ||
41 | return z; | |
42 | } | |
43 | ||
44 | ||
45 | /* Wrapper scalb */ | |
46 | double | |
47 | __scalb (double x, double fn) | |
48 | { | |
8795b4a4 JM |
49 | if (__glibc_unlikely (_LIB_VERSION == _SVID_)) |
50 | return sysv_scalb (x, fn); | |
51 | else | |
52 | { | |
53 | double z = __ieee754_scalb (x, fn); | |
54 | ||
d81f90cc | 55 | if (__glibc_unlikely (!isfinite (z) || z == 0.0)) |
8795b4a4 | 56 | { |
d81f90cc | 57 | if (isnan (z)) |
8795b4a4 | 58 | { |
d81f90cc | 59 | if (!isnan (x) && !isnan (fn)) |
8795b4a4 JM |
60 | __set_errno (EDOM); |
61 | } | |
fe8c2b33 | 62 | else if (isinf (z)) |
8795b4a4 | 63 | { |
fe8c2b33 | 64 | if (!isinf (x) && !isinf (fn)) |
8795b4a4 JM |
65 | __set_errno (ERANGE); |
66 | } | |
67 | else | |
68 | { | |
69 | /* z == 0. */ | |
fe8c2b33 | 70 | if (x != 0.0 && !isinf (fn)) |
8795b4a4 JM |
71 | __set_errno (ERANGE); |
72 | } | |
73 | } | |
74 | return z; | |
75 | } | |
f7eac6eb RM |
76 | } |
77 | weak_alias (__scalb, scalb) | |
c624d232 | 78 | # ifdef NO_LONG_DOUBLE |
cccda09f UD |
79 | strong_alias (__scalb, __scalbl) |
80 | weak_alias (__scalb, scalbl) | |
c624d232 | 81 | # endif |
cccda09f | 82 | #endif |