sysdeps/ia64/fpu/fesetenv.c

   1 /* Install given floating-point environment.
   2    Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <fenv.h>
  22
  23 int
  24 fesetenv (const fenv_t *envp)
  25 {
  26   fenv_t env;
  27
  28   /*
  29      This stinks!
  30      Magic encoding of default values: bit 62+63 set (which will never
  31      happen for a user-space address) means it's not indirect.
  32   */
  33   if (((fenv_t) envp >> 62) == 0x03)
  34     env = (fenv_t) envp & 0x3fffffffffffffff;
  35   else
  36     env = *envp;
  37
  38   __asm__ __volatile__ ("mov.m ar.fpsr=%0;;" :: "r" (env));
  39
  40   return 0;
  41 }