uclibc-ng/libm/s_signbit.c

/* Return nonzero value if number is negative.
   Copyright (C) 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <features.h>
/* Prevent math.h from defining a colliding inline */
#undef __USE_EXTERN_INLINES
#include <math.h>
#include "math_private.h"

int
__signbit (double x)
{
  int32_t hx;

  GET_HIGH_WORD (hx, x);
  return hx & 0x80000000;
}
libm_hidden_def(__signbit)