1 /* Total order operation. dbl-64/wordsize-64 version.
2 Copyright (C) 2016-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #include <math_private.h>
21 #include <nan-high-order-bit.h>
22 #include <libm-alias-double.h>
26 __totalorder (double x
, double y
)
29 EXTRACT_WORDS64 (ix
, x
);
30 EXTRACT_WORDS64 (iy
, y
);
31 #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
32 /* For the preferred quiet NaN convention, this operation is a
33 comparison of the representations of the arguments interpreted as
34 sign-magnitude integers. If both arguments are NaNs, invert the
35 quiet/signaling bit so comparing that way works. */
36 if ((ix
& 0x7fffffffffffffffULL
) > 0x7ff0000000000000ULL
37 && (iy
& 0x7fffffffffffffffULL
) > 0x7ff0000000000000ULL
)
39 ix
^= 0x0008000000000000ULL
;
40 iy
^= 0x0008000000000000ULL
;
43 uint64_t ix_sign
= ix
>> 63;
44 uint64_t iy_sign
= iy
>> 63;
49 libm_alias_double (__totalorder
, totalorder
)