sysdeps/mips/fpu/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 1998-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Jaeger <aj@suse.de>, 1998.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21 #include <fenv_libc.h>
  22 #include <fpu_control.h>
  23
  24 int
  25 feclearexcept (int excepts)
  26 {
  27   int cw;
  28
  29   /* Mask out unsupported bits/exceptions.  */
  30   excepts &= FE_ALL_EXCEPT;
  31
  32   /* Read the complete control word.  */
  33   _FPU_GETCW (cw);
  34
  35   /* Clear exception flag bits and cause bits. If the cause bit is not
  36      cleared, the next CTC instruction (just below) will re-generate the
  37      exception.  */
  38
  39   cw &= ~(excepts | (excepts << CAUSE_SHIFT));
  40
  41   /* Put the new data in effect.  */
  42   _FPU_SETCW (cw);
  43
  44   /* Success.  */
  45   return 0;
  46 }
  47 libm_hidden_def (feclearexcept)