sysdeps/ia64/fpu/fesetround.c

   1 /* Set current rounding direction.
   2    Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Christian Boissat <Christian.Boissat@cern.ch>, 1999.
   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 fesetround (int round)
  25 {
  26   unsigned long int fpsr;
  27
  28   if (round & ~3)
  29     return 0;
  30
  31   /* Get the current state.  */
  32   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (fpsr));
  33
  34   /* Set the relevant bits.  */
  35   fpsr = (fpsr & ~(3UL << 10)) | ((unsigned long int) round << 10);
  36
  37   /* Put the new state in effect.  */
  38   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (fpsr) : "memory");
  39
  40   return 1;
  41 }