sysdeps/loongarch/fpu/s_isinf.c

   1 /* isinf().  LoongArch 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 __isinf (double x)
  24 {
  25   int x_cond;
  26   asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
  27   return -((x_cond & _FCLASS_MINF) ? 1 : 0) | ((x_cond & _FCLASS_PINF) ? 1 : 0);
  28 }
  29 hidden_def (__isinf)
  30 weak_alias (__isinf, isinf)