sysdeps/ieee754/ldbl-96/s_getpayloadl.c

   1 /* Get NaN payload.  ldbl-96 version.
   2    Copyright (C) 2016-2020 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-ldouble.h>
  22 #include <stdint.h>
  23
  24 long double
  25 __getpayloadl (const long double *x)
  26 {
  27   uint16_t se __attribute__ ((unused));
  28   uint32_t hx, lx;
  29   GET_LDOUBLE_WORDS (se, hx, lx, *x);
  30   if ((se & 0x7fff) != 0x7fff
  31       || ((hx & 0x7fffffff) | lx) == 0)
  32     return -1;
  33   hx &= 0x3fffffff;
  34   uint64_t ix = ((uint64_t) hx << 32) | lx;
  35   return (long double) ix;
  36 }
  37 libm_alias_ldouble (__getpayload, getpayload)