1/* Copyright (C) 2011-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
4
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.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <fenv.h>
20#include <math.h>
21#include <math_private.h>
22
23
24static float
25__attribute__ ((noinline))
26invalid_fn (float x, float fn)
27{
28 if (__rintf (fn) != fn)
29 {
30 feraiseexcept (FE_INVALID);
31 return __nan ("");
32 }
33 else if (fn > 65000.0f)
34 return __scalbnf (x, 65000);
35 else
36 return __scalbnf (x,-65000);
37}
38
39
40float
41__ieee754_scalbf (float x, float fn)
42{
43 if (__glibc_unlikely (isnan (x)))
44 return x * fn;
45 if (__glibc_unlikely (!isfinite (fn)))
46 {
47 if (isnan (fn) || fn > 0.0f)
48 return x * fn;
49 if (x == 0.0f)
50 return x;
51 return x / -fn;
52 }
53 if (__glibc_unlikely (fabsf (fn) >= 0x1p31f || (float) (int) fn != fn))
54 return invalid_fn (x, fn);
55
56 return __scalbnf (x, (int) fn);
57}
58strong_alias (__ieee754_scalbf, __scalbf_finite)
59