sysdeps/generic/math-nan-payload-double.h

   1 /* NaN payload handling for double.
   2    Copyright (C) 1997-2023 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #define SET_NAN_PAYLOAD(flt, mant)                      \
  20   do                                                    \
  21     {                                                   \
  22       union ieee754_double u;                           \
  23       u.d = (flt);                                      \
  24       u.ieee_nan.mantissa0 = (mant) >> 32;              \
  25       u.ieee_nan.mantissa1 = (mant);                    \
  26       if ((u.ieee.mantissa0 | u.ieee.mantissa1) != 0)   \
  27         (flt) = u.d;                                    \
  28     }                                                   \
  29   while (0)