1  /* Set the FPU control word.
       2     Copyright (C) 1996-2023 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 <math.h>
      20  #include <fpu_control.h>
      21  
      22  void
      23  __setfpucw (fpu_control_t set)
      24  {
      25    fpu_control_t cw;
      26  
      27    /* Fetch the current control word.  */
      28    _FPU_GETCW (cw);
      29  
      30    /* Preserve the reserved bits, and set the rest as the user
      31       specified (or the default, if the user gave zero).  */
      32    cw &= _FPU_RESERVED;
      33    cw |= set & ~_FPU_RESERVED;
      34  
      35    _FPU_SETCW (cw);
      36  }