ports/sysdeps/ia64/fpu/feenablxcpt.c

   1 /* Enable floating-point exceptions.
   2    Copyright (C) 2000-2014 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21
  22 int
  23 feenableexcept (int excepts)
  24 {
  25   fenv_t old_fpsr;
  26   fenv_t new_fpsr;
  27
  28   /* Get the current fpsr.  */
  29   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (old_fpsr));
  30
  31   new_fpsr = old_fpsr & ~((fenv_t) excepts & FE_ALL_EXCEPT);
  32
  33   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (new_fpsr) : "memory");
  34
  35   return (old_fpsr ^ FE_ALL_EXCEPT) & FE_ALL_EXCEPT;
  36 }