sysdeps/ieee754/ldbl-128/s_fpclassifyl.c

   1 /* Return classification value corresponding to argument.
   2    Copyright (C) 1997-2025 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
  21 #include <math_private.h>
  22
  23
  24 int
  25 __fpclassifyl (_Float128 x)
  26 {
  27   uint64_t hx, lx;
  28   int retval = FP_NORMAL;
  29
  30   GET_LDOUBLE_WORDS64 (hx, lx, x);
  31   lx |= (hx & 0x0000ffffffffffffLL);
  32   hx &= 0x7fff000000000000LL;
  33   if ((hx | lx) == 0)
  34     retval = FP_ZERO;
  35   else if (hx == 0)
  36     retval = FP_SUBNORMAL;
  37   else if (hx == 0x7fff000000000000LL)
  38     retval = lx != 0 ? FP_NAN : FP_INFINITE;
  39
  40   return retval;
  41 }
  42 libm_hidden_def (__fpclassifyl)