mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 09:40:13 +00:00
93 lines
3.4 KiB
C
93 lines
3.4 KiB
C
/* Total order operation. ldbl-128 version.
|
|
Copyright (C) 2016-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <libm-alias-ldouble.h>
|
|
#include <nan-high-order-bit.h>
|
|
#include <stdint.h>
|
|
#include <shlib-compat.h>
|
|
#include <first-versions.h>
|
|
|
|
int
|
|
__totalorderl (const _Float128 *x, const _Float128 *y)
|
|
{
|
|
int64_t hx, hy;
|
|
uint64_t lx, ly;
|
|
GET_LDOUBLE_WORDS64 (hx, lx, *x);
|
|
GET_LDOUBLE_WORDS64 (hy, ly, *y);
|
|
#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
|
|
uint64_t uhx = hx & 0x7fffffffffffffffULL;
|
|
uint64_t uhy = hy & 0x7fffffffffffffffULL;
|
|
/* For the preferred quiet NaN convention, this operation is a
|
|
comparison of the representations of the arguments interpreted as
|
|
sign-magnitude integers. If both arguments are NaNs, invert the
|
|
quiet/signaling bit so comparing that way works. */
|
|
if ((uhx > 0x7fff000000000000ULL || (uhx == 0x7fff000000000000ULL
|
|
&& lx != 0))
|
|
&& (uhy > 0x7fff000000000000ULL || (uhy == 0x7fff000000000000ULL
|
|
&& ly != 0)))
|
|
{
|
|
hx ^= 0x0000800000000000ULL;
|
|
hy ^= 0x0000800000000000ULL;
|
|
}
|
|
#endif
|
|
uint64_t hx_sign = hx >> 63;
|
|
uint64_t hy_sign = hy >> 63;
|
|
hx ^= hx_sign >> 1;
|
|
lx ^= hx_sign;
|
|
hy ^= hy_sign >> 1;
|
|
ly ^= hy_sign;
|
|
return hx < hy || (hx == hy && lx <= ly);
|
|
}
|
|
#ifdef SHARED
|
|
# define CONCATX(x, y) x ## y
|
|
# define CONCAT(x, y) CONCATX (x, y)
|
|
# define UNIQUE_ALIAS(name) CONCAT (name, __COUNTER__)
|
|
# define do_symbol(orig_name, name, aliasname) \
|
|
strong_alias (orig_name, name) \
|
|
versioned_symbol (libm, name, aliasname, GLIBC_2_31)
|
|
# undef weak_alias
|
|
# define weak_alias(name, aliasname) \
|
|
do_symbol (name, UNIQUE_ALIAS (name), aliasname);
|
|
#endif
|
|
libm_alias_ldouble (__totalorder, totalorder)
|
|
#if SHLIB_COMPAT (libm, GLIBC_2_25, GLIBC_2_31)
|
|
int
|
|
attribute_compat_text_section
|
|
__totalorder_compatl (_Float128 x, _Float128 y)
|
|
{
|
|
return __totalorderl (&x, &y);
|
|
}
|
|
/* On platforms that reuse the _Float128 implementation for IEEE long
|
|
double (powerpc64le), the libm_alias_float128_other_r_ldbl macro
|
|
(which is called by the libm_alias_ldouble macro) is used to create
|
|
aliases between *f128 (_Float128 API) and __*ieee128 functions.
|
|
However, this compat version of totalorderl is older than the
|
|
availability of __ieee*128 symbols, thus, the compat alias is not
|
|
required, nor desired. */
|
|
#undef libm_alias_float128_other_r_ldbl
|
|
#define libm_alias_float128_other_r_ldbl(from, to, r)
|
|
#undef do_symbol
|
|
#define do_symbol(orig_name, name, aliasname) \
|
|
strong_alias (orig_name, name) \
|
|
compat_symbol (libm, name, aliasname, \
|
|
CONCAT (FIRST_VERSION_libm_, aliasname))
|
|
libm_alias_ldouble (__totalorder_compat, totalorder)
|
|
#endif
|