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688903eb | 1 | /* Copyright (C) 2011-2018 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. | |
f7eac6eb | 9 | |
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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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
f7eac6eb | 18 | |
9d13fb24 | 19 | #include <math.h> |
9277c064 | 20 | #include <math_private.h> |
f7eac6eb | 21 | |
0ac5ae23 UD |
22 | |
23 | static double | |
24 | __attribute__ ((noinline)) | |
25 | invalid_fn (double x, double fn) | |
f7eac6eb | 26 | { |
0ac5ae23 | 27 | if (__rint (fn) != fn) |
cb864fe0 | 28 | return (fn - fn) / (fn - fn); |
0ac5ae23 UD |
29 | else if (fn > 65000.0) |
30 | return __scalbn (x, 65000); | |
31 | else | |
32 | return __scalbn (x,-65000); | |
33 | } | |
34 | ||
35 | ||
36 | double | |
37 | __ieee754_scalb (double x, double fn) | |
38 | { | |
d81f90cc | 39 | if (__glibc_unlikely (isnan (x))) |
0ac5ae23 | 40 | return x * fn; |
d81f90cc | 41 | if (__glibc_unlikely (!isfinite (fn))) |
0ac5ae23 | 42 | { |
d81f90cc | 43 | if (isnan (fn) || fn > 0.0) |
0ac5ae23 UD |
44 | return x * fn; |
45 | if (x == 0.0) | |
46 | return x; | |
47 | return x / -fn; | |
48 | } | |
ea6029b1 | 49 | if (__glibc_unlikely (fabs (fn) >= 0x1p31 || (double) (int) fn != fn)) |
0ac5ae23 UD |
50 | return invalid_fn (x, fn); |
51 | ||
52 | return __scalbn (x, (int) fn); | |
f7eac6eb | 53 | } |
0ac5ae23 | 54 | strong_alias (__ieee754_scalb, __scalb_finite) |