|
Packit |
6c4009 |
/* Test for signaling NaN.
|
|
Packit |
6c4009 |
Copyright (C) 2013-2018 Free Software Foundation, Inc.
|
|
Packit |
6c4009 |
This file is part of the GNU C Library.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is free software; you can redistribute it and/or
|
|
Packit |
6c4009 |
modify it under the terms of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License as published by the Free Software Foundation; either
|
|
Packit |
6c4009 |
version 2.1 of the License, or (at your option) any later version.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
The GNU C Library is distributed in the hope that it will be useful,
|
|
Packit |
6c4009 |
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
Packit |
6c4009 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Packit |
6c4009 |
Lesser General Public License for more details.
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
You should have received a copy of the GNU Lesser General Public
|
|
Packit |
6c4009 |
License along with the GNU C Library; if not, see
|
|
Packit |
6c4009 |
<http://www.gnu.org/licenses/>. */
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#include <math.h>
|
|
Packit |
6c4009 |
#include <math_private.h>
|
|
Packit |
6c4009 |
#include <nan-high-order-bit.h>
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
int
|
|
Packit |
6c4009 |
__issignalingl (long double x)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
uint32_t exi, hxi, lxi;
|
|
Packit |
6c4009 |
GET_LDOUBLE_WORDS (exi, hxi, lxi, x);
|
|
Packit |
6c4009 |
#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
|
|
Packit |
6c4009 |
# error not implemented
|
|
Packit |
6c4009 |
#else
|
|
Packit |
6c4009 |
/* To keep the following comparison simple, toggle the quiet/signaling bit,
|
|
Packit |
6c4009 |
so that it is set for sNaNs. This is inverse to IEEE 754-2008 (as well as
|
|
Packit |
6c4009 |
common practice for IEEE 754-1985). */
|
|
Packit |
6c4009 |
hxi ^= 0x40000000;
|
|
Packit |
6c4009 |
/* If lxi != 0, then set any suitable bit of the significand in hxi. */
|
|
Packit |
6c4009 |
hxi |= (lxi | -lxi) >> 31;
|
|
Packit |
6c4009 |
/* We do not recognize a pseudo NaN as sNaN; they're invalid on 80387 and
|
|
Packit |
6c4009 |
later. */
|
|
Packit |
6c4009 |
/* We have to compare for greater (instead of greater or equal), because x's
|
|
Packit |
6c4009 |
significand being all-zero designates infinity not NaN. */
|
|
Packit |
6c4009 |
return ((exi & 0x7fff) == 0x7fff) && (hxi > 0xc0000000);
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
libm_hidden_def (__issignalingl)
|