1  /* Set floating-point environment exception handling.
       2     Copyright (C) 2018-2023 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 <fpu_control.h>
      21  #include <fenv_libc.h>
      22  
      23  int
      24  fesetexceptflag (const fexcept_t *flagp, int excepts)
      25  {
      26    fpu_control_t temp;
      27  
      28    /* Get the current exceptions.  */
      29     _FPU_GETFPSR (temp);
      30  
      31    /* Make sure the flags we want restored are legal.  */
      32    excepts &= FE_ALL_EXCEPT;
      33  
      34    /* Now clear the bits called for, and copy them in from flagp.  Note that
      35       we ignore all non-flag bits from *flagp, so they don't matter.  */
      36    temp = ((temp >> CAUSE_SHIFT) & ~excepts) | (*flagp & excepts);
      37    temp = temp << CAUSE_SHIFT;
      38  
      39    _FPU_SETFPSR (temp);
      40  
      41    /* Success.  */
      42    return 0;
      43  }