1  /* Store current floating-point environment and clear exceptions.
       2     Copyright (C) 1997-2023 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  __feholdexcept (fenv_t *envp)
      24  {
      25    fenv_union_t old, new;
      26  
      27    /* Save the currently set exceptions.  */
      28    old.fenv = *envp = fegetenv_register ();
      29  
      30    /* Clear everything except for the rounding modes and non-IEEE arithmetic
      31       flag.  */
      32    new.l = old.l & 0xffffffff00000007LL;
      33  
      34    if (new.l == old.l)
      35      return 0;
      36  
      37    __TEST_AND_ENTER_NON_STOP (old.l, 0ULL);
      38  
      39    /* Put the new state in effect.  */
      40    fesetenv_register (new.fenv);
      41  
      42    return 0;
      43  }
      44  libm_hidden_def (__feholdexcept)
      45  weak_alias (__feholdexcept, feholdexcept)
      46  libm_hidden_weak (feholdexcept)