sysdeps/generic/setfpucw.c

   1 /* Set the FPU control word.
   2 Copyright (C) 1996 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 Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 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 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  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 }