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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/ieee754/dbl-64/s_fpclassify.c
1 /* Return classification value corresponding to argument.
2 Copyright (C) 1997-2021 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 <https://www.gnu.org/licenses/>. */
21 #include <math_private.h>
25 __fpclassify (double x
)
28 int retval
= FP_NORMAL
;
30 EXTRACT_WORDS (hx
, lx
, x
);
36 retval
= FP_SUBNORMAL
;
37 else if (hx
== 0x7ff00000)
38 retval
= lx
!= 0 ? FP_NAN
: FP_INFINITE
;
42 libm_hidden_def (__fpclassify
)