1  /* Disable floating-point exceptions.
       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  
      21  int
      22  fedisableexcept (int excepts)
      23  {
      24    fenv_union_t fe, curr;
      25    int result, new;
      26  
      27    /* Get current exception mask to return.  */
      28    fe.fenv = curr.fenv = fegetenv_control ();
      29    result = fenv_reg_to_exceptions (fe.l);
      30  
      31    if ((excepts & FE_ALL_INVALID) == FE_ALL_INVALID)
      32      excepts = (excepts | FE_INVALID) & ~ FE_ALL_INVALID;
      33  
      34    new = fenv_exceptions_to_reg (excepts);
      35  
      36    if (fenv_reg_to_exceptions (new) != excepts)
      37      return -1;
      38  
      39    /* Sets the new exception mask.  */
      40    fe.l &= ~new;
      41  
      42    if (fe.l != curr.l)
      43      fesetenv_control (fe.fenv);
      44  
      45    __TEST_AND_ENTER_NON_STOP (-1ULL, fe.l);
      46  
      47    return result;
      48  }