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b168057a | 1 | /* Copyright (C) 2011-2015 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 | |
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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 | |
d210ca02 | 19 | #include <fenv.h> |
9d13fb24 | 20 | #include <math.h> |
9277c064 | 21 | #include <math_private.h> |
f7eac6eb | 22 | |
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23 | |
24 | static double | |
25 | __attribute__ ((noinline)) | |
26 | invalid_fn (double x, double fn) | |
f7eac6eb | 27 | { |
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28 | if (__rint (fn) != fn) |
29 | { | |
0747f818 | 30 | __feraiseexcept (FE_INVALID); |
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31 | return __nan (""); |
32 | } | |
33 | else if (fn > 65000.0) | |
34 | return __scalbn (x, 65000); | |
35 | else | |
36 | return __scalbn (x,-65000); | |
37 | } | |
38 | ||
39 | ||
40 | double | |
41 | __ieee754_scalb (double x, double fn) | |
42 | { | |
a1ffb40e | 43 | if (__glibc_unlikely (__isnan (x))) |
0ac5ae23 | 44 | return x * fn; |
a1ffb40e | 45 | if (__glibc_unlikely (!__finite (fn))) |
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46 | { |
47 | if (__isnan (fn) || fn > 0.0) | |
48 | return x * fn; | |
49 | if (x == 0.0) | |
50 | return x; | |
51 | return x / -fn; | |
52 | } | |
ea6029b1 | 53 | if (__glibc_unlikely (fabs (fn) >= 0x1p31 || (double) (int) fn != fn)) |
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54 | return invalid_fn (x, fn); |
55 | ||
56 | return __scalbn (x, (int) fn); | |
f7eac6eb | 57 | } |
0ac5ae23 | 58 | strong_alias (__ieee754_scalb, __scalb_finite) |