1/* Total order operation. ldbl-128 version.
2 Copyright (C) 2016-2021 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 <https://www.gnu.org/licenses/>. */
18
19#include <math.h>
20#include <math_private.h>
21#include <libm-alias-ldouble.h>
22#include <nan-high-order-bit.h>
23#include <stdint.h>
24#include <shlib-compat.h>
25#include <first-versions.h>
26
27int
28__totalorderl (const _Float128 *x, const _Float128 *y)
29{
30 int64_t hx, hy;
31 uint64_t lx, ly;
32 GET_LDOUBLE_WORDS64 (hx, lx, *x);
33 GET_LDOUBLE_WORDS64 (hy, ly, *y);
34#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
35 uint64_t uhx = hx & 0x7fffffffffffffffULL;
36 uint64_t uhy = hy & 0x7fffffffffffffffULL;
37 /* For the preferred quiet NaN convention, this operation is a
38 comparison of the representations of the arguments interpreted as
39 sign-magnitude integers. If both arguments are NaNs, invert the
40 quiet/signaling bit so comparing that way works. */
41 if ((uhx > 0x7fff000000000000ULL || (uhx == 0x7fff000000000000ULL
42 && lx != 0))
43 && (uhy > 0x7fff000000000000ULL || (uhy == 0x7fff000000000000ULL
44 && ly != 0)))
45 {
46 hx ^= 0x0000800000000000ULL;
47 hy ^= 0x0000800000000000ULL;
48 }
49#endif
50 uint64_t hx_sign = hx >> 63;
51 uint64_t hy_sign = hy >> 63;
52 hx ^= hx_sign >> 1;
53 lx ^= hx_sign;
54 hy ^= hy_sign >> 1;
55 ly ^= hy_sign;
56 return hx < hy || (hx == hy && lx <= ly);
57}
58#ifdef SHARED
59# define CONCATX(x, y) x ## y
60# define CONCAT(x, y) CONCATX (x, y)
61# define UNIQUE_ALIAS(name) CONCAT (name, __COUNTER__)
62# define do_symbol(orig_name, name, aliasname) \
63 strong_alias (orig_name, name) \
64 versioned_symbol (libm, name, aliasname, GLIBC_2_31)
65# undef weak_alias
66# define weak_alias(name, aliasname) \
67 do_symbol (name, UNIQUE_ALIAS (name), aliasname);
68#endif
69libm_alias_ldouble (__totalorder, totalorder)
70#if SHLIB_COMPAT (libm, GLIBC_2_25, GLIBC_2_31)
71int
72attribute_compat_text_section
73__totalorder_compatl (_Float128 x, _Float128 y)
74{
75 return __totalorderl (&x, &y);
76}
77/* On platforms that reuse the _Float128 implementation for IEEE long
78 double (powerpc64le), the libm_alias_float128_other_r_ldbl macro
79 (which is called by the libm_alias_ldouble macro) is used to create
80 aliases between *f128 (_Float128 API) and __*ieee128 functions.
81 However, this compat version of totalorderl is older than the
82 availability of __ieee*128 symbols, thus, the compat alias is not
83 required, nor desired. */
84#undef libm_alias_float128_other_r_ldbl
85#define libm_alias_float128_other_r_ldbl(from, to, r)
86#undef do_symbol
87#define do_symbol(orig_name, name, aliasname) \
88 strong_alias (orig_name, name) \
89 compat_symbol (libm, name, aliasname, \
90 CONCAT (FIRST_VERSION_libm_, aliasname))
91libm_alias_ldouble (__totalorder_compat, totalorder)
92#endif
93