glibc/sysdeps/loongarch/fpu/s_fpclassifyf.c

/* Copyright (C) 2017-2023 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <https://www.gnu.org/licenses/>.  */

#include <math.h>
#include <fenv_private.h>

int
__fpclassifyf (float x)
{
  int cls;
  asm volatile ("fclass.s \t%0, %1" : "=f" (cls) : "f" (x));

  if (__glibc_likely (!!(cls & _FCLASS_NORM)))
    return FP_NORMAL;
  if (__glibc_likely (!!(cls & _FCLASS_ZERO)))
    return FP_ZERO;
  if (__glibc_likely (!!(cls & _FCLASS_SUBNORM)))
    return FP_SUBNORMAL;
  if (__glibc_likely (!!(cls & _FCLASS_INF)))
    return FP_INFINITE;
  return FP_NAN;
}
libm_hidden_def (__fpclassifyf)