sysdeps/ieee754/dbl-64/wordsize-64/s_totalordermag.c

   1 /* Total order operation on absolute values.  dbl-64/wordsize-64 version.
   2    Copyright (C) 2016-2018 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20 #include <math_private.h>
  21 #include <nan-high-order-bit.h>
  22 #include <libm-alias-double.h>
  23 #include <stdint.h>
  24
  25 int
  26 __totalordermag (double x, double y)
  27 {
  28   uint64_t ix, iy;
  29   EXTRACT_WORDS64 (ix, x);
  30   EXTRACT_WORDS64 (iy, y);
  31   ix &= 0x7fffffffffffffffULL;
  32   iy &= 0x7fffffffffffffffULL;
  33 #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
  34   /* For the preferred quiet NaN convention, this operation is a
  35      comparison of the representations of the absolute values of the
  36      arguments.  If both arguments are NaNs, invert the
  37      quiet/signaling bit so comparing that way works.  */
  38   if (ix > 0x7ff0000000000000ULL && iy > 0x7ff0000000000000ULL)
  39     {
  40       ix ^= 0x0008000000000000ULL;
  41       iy ^= 0x0008000000000000ULL;
  42     }
  43 #endif
  44   return ix <= iy;
  45 }
  46 libm_alias_double (__totalordermag, totalordermag)