mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 17:40:06 +00:00
74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/* Total order operation. ldbl-128ibm 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 <nan-high-order-bit.h>
|
|
#include <stdint.h>
|
|
#include <shlib-compat.h>
|
|
|
|
int
|
|
__totalorderl (const long double *x, const long double *y)
|
|
{
|
|
double xhi, xlo, yhi, ylo;
|
|
int64_t hx, hy, lx, ly;
|
|
|
|
ldbl_unpack (*x, &xhi, &xlo);
|
|
EXTRACT_WORDS64 (hx, xhi);
|
|
ldbl_unpack (*y, &yhi, &ylo);
|
|
EXTRACT_WORDS64 (hy, yhi);
|
|
#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
|
|
# error not implemented
|
|
#endif
|
|
uint64_t hx_sign = hx >> 63;
|
|
uint64_t hy_sign = hy >> 63;
|
|
int64_t hx_adj = hx ^ (hx_sign >> 1);
|
|
int64_t hy_adj = hy ^ (hy_sign >> 1);
|
|
if (hx_adj < hy_adj)
|
|
return 1;
|
|
else if (hx_adj > hy_adj)
|
|
return 0;
|
|
|
|
/* The high doubles are identical. If they are NaNs or both the low
|
|
parts are zero, the low parts are not significant (and if they
|
|
are infinities, both the low parts must be zero). */
|
|
if ((hx & 0x7fffffffffffffffULL) >= 0x7ff0000000000000ULL)
|
|
return 1;
|
|
EXTRACT_WORDS64 (lx, xlo);
|
|
EXTRACT_WORDS64 (ly, ylo);
|
|
if (((lx | ly) & 0x7fffffffffffffffULL) == 0)
|
|
return 1;
|
|
|
|
/* Otherwise compare the low parts. */
|
|
uint64_t lx_sign = lx >> 63;
|
|
uint64_t ly_sign = ly >> 63;
|
|
lx ^= lx_sign >> 1;
|
|
ly ^= ly_sign >> 1;
|
|
return lx <= ly;
|
|
}
|
|
versioned_symbol (libm, __totalorderl, totalorderl, GLIBC_2_31);
|
|
#if SHLIB_COMPAT (libm, GLIBC_2_25, GLIBC_2_31)
|
|
int
|
|
attribute_compat_text_section
|
|
__totalorder_compatl (long double x, long double y)
|
|
{
|
|
return __totalorderl (&x, &y);
|
|
}
|
|
compat_symbol (libm, __totalorder_compatl, totalorderl, GLIBC_2_25);
|
|
#endif
|