ldbl-128ibm: Automatic replacing of _Float128 and L()
[glibc.git] / math / w_llogb_template.c
blob3bd92dca2e0c0bb6872f036f32caa4d45d894ee3
1 /* Wrapper to implement llogb in terms of ilogb.
2 Copyright (C) 2012-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #include <math.h>
20 #include <errno.h>
21 #include <limits.h>
22 #include <math_private.h>
24 long int
25 M_DECL_FUNC (__llogb) (FLOAT x)
27 int r = M_SUF (__ieee754_ilogb) (x);
28 long int lr = r;
29 if (__glibc_unlikely (r == FP_ILOGB0)
30 || __glibc_unlikely (r == FP_ILOGBNAN)
31 || __glibc_unlikely (r == INT_MAX))
33 #if LONG_MAX != INT_MAX
34 if (r == FP_ILOGB0)
35 lr = FP_LLOGB0;
36 else if (r == FP_ILOGBNAN)
37 lr = FP_LLOGBNAN;
38 else
39 lr = LONG_MAX;
40 #endif
41 __set_errno (EDOM);
42 __feraiseexcept (FE_INVALID);
44 return lr;
46 declare_mgen_alias (__llogb, llogb)