sysdeps/ieee754/float128/s_signbitf128.c

   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.  */
  25 int
  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 }
  37 hidden_def (__signbitf128)