1  /* Return classification value corresponding to argument.
       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  #include <math.h>
      20  
      21  #include <math_private.h>
      22  
      23  
      24  int
      25  __fpclassifyl (long double x)
      26  {
      27    uint32_t ex, hx, lx;
      28    int retval = FP_NORMAL;
      29  
      30    GET_LDOUBLE_WORDS (ex, hx, lx, x);
      31    ex &= 0x7fff;
      32    if ((ex | lx | hx) == 0)
      33      retval = FP_ZERO;
      34    else if (ex == 0 && (hx & 0x80000000) == 0)
      35      retval = FP_SUBNORMAL;
      36    /* Pseudo-normals, i.e. pseudo-zero, pseudo-infinity and un-normals.  They
      37       behave like NaNs, so categorize them as such.  */
      38    else if ((hx & 0x80000000) == 0)
      39      retval = FP_NAN;
      40    else if (ex == 0x7fff)
      41      retval = ((hx & 0x7fffffff) | lx) != 0 ? FP_NAN : FP_INFINITE;
      42  
      43    return retval;
      44  }
      45  libm_hidden_def (__fpclassifyl)