mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 22:30:12 +00:00
58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/* Total order operation. ldbl-96 version.
|
|
Copyright (C) 2016-2017 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <float.h>
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <nan-high-order-bit.h>
|
|
#include <stdint.h>
|
|
|
|
int
|
|
totalorderl (long double x, long double y)
|
|
{
|
|
int16_t expx, expy;
|
|
uint32_t hx, hy;
|
|
uint32_t lx, ly;
|
|
GET_LDOUBLE_WORDS (expx, hx, lx, x);
|
|
GET_LDOUBLE_WORDS (expy, hy, ly, y);
|
|
if (LDBL_MIN_EXP == -16382)
|
|
{
|
|
/* M68K variant: for the greatest exponent, the high mantissa
|
|
bit is not significant and both values of it are valid, so
|
|
set it before comparing. For the Intel variant, only one
|
|
value of the high mantissa bit is valid for each exponent, so
|
|
this is not necessary. */
|
|
if ((expx & 0x7fff) == 0x7fff)
|
|
hx |= 0x80000000;
|
|
if ((expy & 0x7fff) == 0x7fff)
|
|
hy |= 0x80000000;
|
|
}
|
|
#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
|
|
# error not implemented
|
|
#endif
|
|
uint32_t x_sign = expx >> 15;
|
|
uint32_t y_sign = expy >> 15;
|
|
expx ^= x_sign >> 17;
|
|
hx ^= x_sign;
|
|
lx ^= x_sign;
|
|
expy ^= y_sign >> 17;
|
|
hy ^= y_sign;
|
|
ly ^= y_sign;
|
|
return expx < expy || (expx == expy && (hx < hy || (hx == hy && lx <= ly)));
|
|
}
|