1 /* Total order operation. ldbl-96 version.
2 Copyright (C) 2016-2022 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 <float.h>
20 #include <math.h>
21 #include <math_private.h>
22 #include <libm-alias-ldouble.h>
23 #include <nan-high-order-bit.h>
24 #include <stdint.h>
25 #include <shlib-compat.h>
26 #include <first-versions.h>
27
28 int
__totalorderl(const long double * x,const long double * y)29 __totalorderl (const long double *x, const long double *y)
30 {
31 int16_t expx, expy;
32 uint32_t hx, hy;
33 uint32_t lx, ly;
34 GET_LDOUBLE_WORDS (expx, hx, lx, *x);
35 GET_LDOUBLE_WORDS (expy, hy, ly, *y);
36 if (LDBL_MIN_EXP == -16382)
37 {
38 /* M68K variant: for the greatest exponent, the high mantissa
39 bit is not significant and both values of it are valid, so
40 set it before comparing. For the Intel variant, only one
41 value of the high mantissa bit is valid for each exponent, so
42 this is not necessary. */
43 if ((expx & 0x7fff) == 0x7fff)
44 hx |= 0x80000000;
45 if ((expy & 0x7fff) == 0x7fff)
46 hy |= 0x80000000;
47 }
48 #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
49 # error not implemented
50 #endif
51 uint32_t x_sign = expx >> 15;
52 uint32_t y_sign = expy >> 15;
53 expx ^= x_sign >> 17;
54 hx ^= x_sign;
55 lx ^= x_sign;
56 expy ^= y_sign >> 17;
57 hy ^= y_sign;
58 ly ^= y_sign;
59 return expx < expy || (expx == expy && (hx < hy || (hx == hy && lx <= ly)));
60 }
61 #ifdef SHARED
62 # define CONCATX(x, y) x ## y
63 # define CONCAT(x, y) CONCATX (x, y)
64 # define UNIQUE_ALIAS(name) CONCAT (name, __COUNTER__)
65 # define do_symbol(orig_name, name, aliasname) \
66 strong_alias (orig_name, name) \
67 versioned_symbol (libm, name, aliasname, GLIBC_2_31)
68 # undef weak_alias
69 # define weak_alias(name, aliasname) \
70 do_symbol (name, UNIQUE_ALIAS (name), aliasname);
71 #endif
libm_alias_ldouble(__totalorder,totalorder)72 libm_alias_ldouble (__totalorder, totalorder)
73 #if SHLIB_COMPAT (libm, GLIBC_2_25, GLIBC_2_31)
74 int
75 attribute_compat_text_section
76 __totalorder_compatl (long double x, long double y)
77 {
78 return __totalorderl (&x, &y);
79 }
80 #undef do_symbol
81 #define do_symbol(orig_name, name, aliasname) \
82 strong_alias (orig_name, name) \
83 compat_symbol (libm, name, aliasname, \
84 CONCAT (FIRST_VERSION_libm_, aliasname))
85 libm_alias_ldouble (__totalorder_compat, totalorder)
86 #endif
87