1/* Copyright (C) 2012-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Adhemerval Zanella <azanella@linux.vnet.ibm.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 <math.h>
20#include <errno.h>
21#include <limits.h>
22#include <math_private.h>
23
24/* wrapper ilogb */
25int
26__ilogb (double x)
27{
28 int r = __ieee754_ilogb (x);
29 if (__builtin_expect (r == FP_ILOGB0, 0)
30 || __builtin_expect (r == FP_ILOGBNAN, 0)
31 || __builtin_expect (r == INT_MAX, 0))
32 {
33 __set_errno (EDOM);
34 __feraiseexcept (FE_INVALID);
35 }
36 return r;
37}
38weak_alias (__ilogb, ilogb)
39#ifdef NO_LONG_DOUBLE
40strong_alias (__ilogb, __ilogbl)
41weak_alias (__ilogb, ilogbl)
42#endif
43