/* Test for signaling NaN.

   Copyright (C) 2013-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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, see

   <http://www.gnu.org/licenses/>.  */

#include <math.h>

#include <math_private.h>

#include <nan-high-order-bit.h>

int

__issignalingf (float x)

{

  uint32_t xi;

  GET_FLOAT_WORD (xi, x);

#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN

  /* We only have to care about the high-order bit of x's significand, because

     having it set (sNaN) already makes the significand different from that

     used to designate infinity.  */

  return (xi & 0x7fc00000) == 0x7fc00000;

#else

  /* To keep the following comparison simple, toggle the quiet/signaling bit,

     so that it is set for sNaNs.  This is inverse to IEEE 754-2008 (as well as

     common practice for IEEE 754-1985).  */

  xi ^= 0x00400000;

  /* We have to compare for greater (instead of greater or equal), because x's

     significand being all-zero designates infinity not NaN.  */

  return (xi & 0x7fffffff) > 0x7fc00000;

#endif

}

libm_hidden_def (__issignalingf)