libm/i386/fegetenv.c

   1 /* Store current floating-point environment.
   2    Copyright (C) 1997,1999,2000,2001,2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <fenv.h>
  22
  23 int
  24 fegetenv (fenv_t *envp)
  25 {
  26   __asm__ ("fnstenv %0" : "=m" (*envp));
  27   /* And load it right back since the processor changes the mask.
  28      Intel thought this opcode to be used in interrupt handlers which
  29      would block all exceptions.  */
  30   __asm__ ("fldenv %0" : : "m" (*envp));
  31
  32   /* Success.  */
  33   return 0;
  34 }