1/* Total order operation. dbl-64/wordsize-64 version.
2 Copyright (C) 2016-2019 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 <math.h>
20#include <math_private.h>
21#include <nan-high-order-bit.h>
22#include <libm-alias-double.h>
23#include <stdint.h>
24
25int
26__totalorder (double x, double y)
27{
28 int64_t ix, iy;
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)
38 {
39 ix ^= 0x0008000000000000ULL;
40 iy ^= 0x0008000000000000ULL;
41 }
42#endif
43 uint64_t ix_sign = ix >> 63;
44 uint64_t iy_sign = iy >> 63;
45 ix ^= ix_sign >> 1;
46 iy ^= iy_sign >> 1;
47 return ix <= iy;
48}
49libm_alias_double (__totalorder, totalorder)
50