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

   1 /* Total order operation on absolute values.  dbl-64/wordsize-64 version.
   2    Copyright (C) 2016-2017 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 <stdint.h>
  23
  24 int
  25 totalordermag (double x, double y)
  26 {
  27   uint64_t ix, iy;
  28   EXTRACT_WORDS64 (ix, x);
  29   EXTRACT_WORDS64 (iy, y);
  30   ix &= 0x7fffffffffffffffULL;
  31   iy &= 0x7fffffffffffffffULL;
  32 #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
  33   /* For the preferred quiet NaN convention, this operation is a
  34      comparison of the representations of the absolute values of the
  35      arguments.  If both arguments are NaNs, invert the
  36      quiet/signaling bit so comparing that way works.  */
  37   if (ix > 0x7ff0000000000000ULL && iy > 0x7ff0000000000000ULL)
  38     {
  39       ix ^= 0x0008000000000000ULL;
  40       iy ^= 0x0008000000000000ULL;
  41     }
  42 #endif
  43   return ix <= iy;
  44 }
  45 #ifdef NO_LONG_DOUBLE
  46 weak_alias (totalordermag, totalordermagl)
  47 #endif