1/* Return nonzero value if number is negative.
2 Copyright (C) 2017-2018 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 <http://www.gnu.org/licenses/>. */
18
19#include <float128_private.h>
20#include <math.h>
21#include <math_private.h>
22
23/* Once GCC >= 6.0 is required for building glibc, this implementation can
24 be removed and replaced with an inclusion of ldbl-128/s_signbitl.c. */
25int
26__signbitf128 (_Float128 x)
27{
28#if __GNUC_PREREQ (6, 0)
29 return __builtin_signbit (x);
30#else
31 int64_t e;
32
33 GET_FLOAT128_MSW64 (e, x);
34 return e < 0;
35#endif
36}
37hidden_def (__signbitf128)
38