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1 | /* Total order operation. ldbl-128 version. |
2 | Copyright (C) 2016 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 <stdint.h> | |
22 | ||
23 | int | |
24 | totalorderl (_Float128 x, _Float128 y) | |
25 | { | |
26 | int64_t hx, hy; | |
27 | uint64_t lx, ly; | |
28 | GET_LDOUBLE_WORDS64 (hx, lx, x); | |
29 | GET_LDOUBLE_WORDS64 (hy, ly, y); | |
30 | #ifdef HIGH_ORDER_BIT_IS_SET_FOR_SNAN | |
31 | uint64_t uhx = hx & 0x7fffffffffffffffULL; | |
32 | uint64_t uhy = hy & 0x7fffffffffffffffULL; | |
33 | /* For the preferred quiet NaN convention, this operation is a | |
34 | comparison of the representations of the arguments interpreted as | |
35 | sign-magnitude integers. If both arguments are NaNs, invert the | |
36 | quiet/signaling bit so comparing that way works. */ | |
37 | if ((uhx > 0x7fff000000000000ULL || (uhx == 0x7fff000000000000ULL | |
38 | && lx != 0)) | |
39 | && (uhy > 0x7fff000000000000ULL || (uhy == 0x7fff000000000000ULL | |
40 | && ly != 0))) | |
41 | { | |
42 | hx ^= 0x0000800000000000ULL; | |
43 | hy ^= 0x0000800000000000ULL; | |
44 | } | |
45 | #endif | |
46 | uint64_t hx_sign = hx >> 63; | |
47 | uint64_t hy_sign = hy >> 63; | |
48 | hx ^= hx_sign >> 1; | |
49 | lx ^= hx_sign; | |
50 | hy ^= hy_sign >> 1; | |
51 | ly ^= hy_sign; | |
52 | return hx < hy || (hx == hy && lx <= ly); | |
53 | } |