1/* Wrapper to set errno for ilogb.
2 Copyright (C) 2012-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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 <https://www.gnu.org/licenses/>. */
18
19#include <math.h>
20#include <errno.h>
21#include <limits.h>
22#include <math_private.h>
23#include <fenv.h>
24
25/* wrapper ilogb */
26int
27M_DECL_FUNC (__ilogb) (FLOAT x)
28{
29 int r = M_SUF (__ieee754_ilogb) (x);
30 if (__builtin_expect (r == FP_ILOGB0, 0)
31 || __builtin_expect (r == FP_ILOGBNAN, 0)
32 || __builtin_expect (r == INT_MAX, 0))
33 {
34 __set_errno (EDOM);
35 __feraiseexcept (FE_INVALID);
36 }
37 return r;
38}
39declare_mgen_alias (__ilogb, ilogb)
40