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 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 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 & ~((fenv_t) excepts & FE_ALL_EXCEPT);
  33
  34   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (new_fpsr) : "memory");
  35
  36   return (old_fpsr ^ FE_ALL_EXCEPT) & FE_ALL_EXCEPT;
  37 }