sysdeps/ieee754/dbl-64/s_getpayload.c

   1 /* Get NaN payload.
   2    Copyright (C) 2016-2023 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 #include <math.h>
  20 #include <math_private.h>
  21 #include <libm-alias-double.h>
  22 #include <stdint.h>
  23 #include <fix-int-fp-convert-zero.h>
  24
  25 double
  26 __getpayload (const double *x)
  27 {
  28   uint64_t ix;
  29   EXTRACT_WORDS64 (ix, *x);
  30   if ((ix & 0x7ff0000000000000ULL) != 0x7ff0000000000000ULL
  31       || (ix & 0xfffffffffffffULL) == 0)
  32     return -1;
  33   ix &= 0x7ffffffffffffULL;
  34   if (FIX_INT_FP_CONVERT_ZERO && ix == 0)
  35     return 0.0f;
  36   return (double) ix;
  37 }
  38 libm_alias_double (__getpayload, getpayload)