sysdeps/ia64/fpu/feenablxcpt.c

   1 /* Enable floating-point exceptions.
   2    Copyright (C) 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 feenableexcept (int excepts)
  25 {
  26   fenv_t old_fpsr;
  27   fenv_t new_fpsr;
  28
  29   /* Get the current fpsr.  */
  30   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r " (old_fpsr));
  31
  32   new_fpsr = ((old_fpsr & FE_ALL_EXCEPT)
  33               | (old_fpsr & ((unsigned long int) excepts ^ FE_ALL_EXCEPT)));
  34
  35   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (new_fpsr) : "memory");
  36
  37   return (old_fpsr ^ FE_ALL_EXCEPT) & FE_ALL_EXCEPT;
  38 }