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04277e02 | 1 | /* Copyright (C) 2011-2019 Free Software Foundation, Inc. |
0ac5ae23 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. | |
f7eac6eb | 4 | |
0ac5ae23 UD |
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. | |
f7eac6eb | 14 | |
0ac5ae23 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
f7eac6eb | 18 | |
0ac5ae23 | 19 | #include <errno.h> |
9d13fb24 | 20 | #include <math.h> |
9277c064 | 21 | #include <math_private.h> |
813378e9 | 22 | #include <math-svid-compat.h> |
f7eac6eb | 23 | |
f7eac6eb | 24 | |
4f3647e4 | 25 | #if LIBM_SVID_COMPAT |
0ac5ae23 UD |
26 | static double |
27 | __attribute__ ((noinline)) | |
28 | sysv_scalb (double x, double fn) | |
f7eac6eb | 29 | { |
0ac5ae23 UD |
30 | double z = __ieee754_scalb (x, fn); |
31 | ||
d81f90cc | 32 | if (__glibc_unlikely (isinf (z))) |
0ac5ae23 | 33 | { |
d81f90cc | 34 | if (isfinite (x)) |
0ac5ae23 UD |
35 | return __kernel_standard (x, fn, 32); /* scalb overflow */ |
36 | else | |
37 | __set_errno (ERANGE); | |
38 | } | |
39 | else if (__builtin_expect (z == 0.0, 0) && z != x) | |
40 | return __kernel_standard (x, fn, 33); /* scalb underflow */ | |
41 | ||
42 | return z; | |
43 | } | |
4f3647e4 | 44 | #endif |
0ac5ae23 UD |
45 | |
46 | ||
47 | /* Wrapper scalb */ | |
48 | double | |
49 | __scalb (double x, double fn) | |
50 | { | |
4f3647e4 | 51 | #if LIBM_SVID_COMPAT |
8795b4a4 JM |
52 | if (__glibc_unlikely (_LIB_VERSION == _SVID_)) |
53 | return sysv_scalb (x, fn); | |
54 | else | |
4f3647e4 | 55 | #endif |
8795b4a4 JM |
56 | { |
57 | double z = __ieee754_scalb (x, fn); | |
58 | ||
d81f90cc | 59 | if (__glibc_unlikely (!isfinite (z) || z == 0.0)) |
8795b4a4 | 60 | { |
d81f90cc | 61 | if (isnan (z)) |
8795b4a4 | 62 | { |
d81f90cc | 63 | if (!isnan (x) && !isnan (fn)) |
8795b4a4 JM |
64 | __set_errno (EDOM); |
65 | } | |
fe8c2b33 | 66 | else if (isinf (z)) |
8795b4a4 | 67 | { |
fe8c2b33 | 68 | if (!isinf (x) && !isinf (fn)) |
8795b4a4 JM |
69 | __set_errno (ERANGE); |
70 | } | |
71 | else | |
72 | { | |
73 | /* z == 0. */ | |
fe8c2b33 | 74 | if (x != 0.0 && !isinf (fn)) |
8795b4a4 JM |
75 | __set_errno (ERANGE); |
76 | } | |
77 | } | |
78 | return z; | |
79 | } | |
f7eac6eb RM |
80 | } |
81 | weak_alias (__scalb, scalb) | |
cccda09f UD |
82 | #ifdef NO_LONG_DOUBLE |
83 | strong_alias (__scalb, __scalbl) | |
84 | weak_alias (__scalb, scalbl) | |
85 | #endif |