1  /* Clear given exceptions in current floating-point environment.
       2     Copyright (C) 2000-2023 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_libc.h>
      20  #include <fpu_control.h>
      21  
      22  int
      23  feclearexcept (int excepts)
      24  {
      25    fexcept_t temp;
      26  
      27    /* Mask out unsupported bits/exceptions.  */
      28    excepts &= FE_ALL_EXCEPT;
      29  
      30    _FPU_GETCW (temp);
      31    /* Clear the relevant bits.  */
      32    temp &= ~(excepts << FPC_FLAGS_SHIFT);
      33    if ((temp & FPC_NOT_FPU_EXCEPTION) == 0)
      34      /* Bits 6, 7 of dxc-byte are zero,
      35         thus bits 0-5 of dxc-byte correspond to the flag-bits.
      36         Clear the relevant bits in flags and dxc-field.  */
      37      temp &= ~(excepts << FPC_DXC_SHIFT);
      38  
      39    /* Put the new data in effect.  */
      40    _FPU_SETCW (temp);
      41  
      42    /* Success.  */
      43    return 0;
      44  }
      45  libm_hidden_def (feclearexcept)