1  /* Clear given exceptions in current floating-point environment.
       2     Copyright (C) 2022-2023 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 <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)