sysdeps/loongarch/fpu/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 2022 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 <fenv.h>
  20 #include <fenv_libc.h>
  21 #include <fpu_control.h>
  22
  23 int
  24 feclearexcept (int excepts)
  25 {
  26   int cw;
  27
  28   /* Mask out unsupported bits/exceptions.  */
  29   excepts &= FE_ALL_EXCEPT;
  30
  31   /* Read the complete control word.  */
  32   _FPU_GETCW (cw);
  33
  34   /* Clear exception flag bits and cause bits.  If the cause bit is not
  35      cleared, the next CTC instruction (just below) will re-generate the
  36      exception.  */
  37
  38   cw &= ~(excepts | (excepts << CAUSE_SHIFT));
  39
  40   /* Put the new data in effect.  */
  41   _FPU_SETCW (cw);
  42
  43   /* Success.  */
  44   return 0;
  45 }
  46 libm_hidden_def (feclearexcept)