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/* Total order operation. dbl-64/wordsize-64 version.
Copyright (C) 2016-2018 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 <math.h>
#include <math_private.h>
#include <nan-high-order-bit.h>
#include <libm-alias-double.h>
#include <stdint.h>
int
__totalorder (double x, double y)
{
int64_t ix, iy;
EXTRACT_WORDS64 (ix, x);
EXTRACT_WORDS64 (iy, y);
#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
/* 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 ((ix & 0x7fffffffffffffffULL) > 0x7ff0000000000000ULL
&& (iy & 0x7fffffffffffffffULL) > 0x7ff0000000000000ULL)
{
ix ^= 0x0008000000000000ULL;
iy ^= 0x0008000000000000ULL;
}
#endif
uint64_t ix_sign = ix >> 63;
uint64_t iy_sign = iy >> 63;
ix ^= ix_sign >> 1;
iy ^= iy_sign >> 1;
return ix <= iy;
}
libm_alias_double (__totalorder, totalorder)
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