sysdeps/ia64/fpu/fclrexcpt.c

   1 /* Clear given exceptions in current floating-point environment.
   2    Copyright (C) 1997, 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 and
   5                   Jes Sorensen <Jes.Sorensen@cern.ch>, 2000
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #include <fenv.h>
  23
  24 int
  25 feclearexcept (int excepts)
  26 {
  27   fenv_t fpsr;
  28
  29   /* Get the current state.  */
  30   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (fpsr));
  31
  32   /* Clear the relevant bits.  */
  33   fpsr &= ~(((fenv_t) ((excepts & FE_ALL_EXCEPT) << 13)));
  34   /* Put the new state in effect.  */
  35   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (fpsr) : "memory");
  36
  37   /* success */
  38   return 0;
  39 }