sysdeps/ieee754/ldbl-128/s_totalordermagl.c

   1 /* Total order operation on absolute values.  ldbl-128 version.
   2    Copyright (C) 2016 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 totalordermagl (_Float128 x, _Float128 y)
  26 {
  27   uint64_t hx, hy;
  28   uint64_t lx, ly;
  29   GET_LDOUBLE_WORDS64 (hx, lx, x);
  30   GET_LDOUBLE_WORDS64 (hy, ly, y);
  31   hx &= 0x7fffffffffffffffULL;
  32   hy &= 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 ((hx > 0x7fff000000000000ULL || (hx == 0x7fff000000000000ULL
  39                                       && lx != 0))
  40       && (hy > 0x7fff000000000000ULL || (hy == 0x7fff000000000000ULL
  41                                          && ly != 0)))
  42     {
  43       hx ^= 0x0000800000000000ULL;
  44       hy ^= 0x0000800000000000ULL;
  45     }
  46 #endif
  47   return hx < hy || (hx == hy && lx <= ly);
  48 }