sysdeps/riscv/rvd/s_fpclassify.c

   1 /* fpclassify().  RISC-V version.
   2    Copyright (C) 2017-2023 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 <fenv_private.h>
  21
  22 int
  23 __fpclassify (double x)
  24 {
  25   int cls = _FCLASS (x);
  26   if (__builtin_expect (cls & _FCLASS_NORM, _FCLASS_NORM))
  27     return FP_NORMAL;
  28   if (__builtin_expect (cls & _FCLASS_ZERO, _FCLASS_ZERO))
  29     return FP_ZERO;
  30   if (__builtin_expect (cls & _FCLASS_SUBNORM, _FCLASS_SUBNORM))
  31     return FP_SUBNORMAL;
  32   if (__builtin_expect (cls & _FCLASS_INF, _FCLASS_INF))
  33     return FP_INFINITE;
  34   return FP_NAN;
  35 }
  36 libm_hidden_def (__fpclassify)