sysdeps/powerpc/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 Geoffrey Keating <geoffk@geoffk.org>, 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_libc.h>
  22
  23 int
  24 feenableexcept (int excepts)
  25 {
  26   fenv_union_t fe;
  27   int result, new;
  28
  29   result = fegetexcept ();
  30
  31   if ((excepts & FE_ALL_INVALID) == FE_ALL_INVALID)
  32     excepts = (excepts | FE_INVALID) & ~ FE_ALL_INVALID;
  33
  34   fe.fenv = fegetenv_register ();
  35   if (excepts & FE_INEXACT)
  36     fe.l[1] |= (1 << (31 - FPSCR_XE));
  37   if (excepts & FE_DIVBYZERO)
  38     fe.l[1] |= (1 << (31 - FPSCR_ZE));
  39   if (excepts & FE_UNDERFLOW)
  40     fe.l[1] |= (1 << (31 - FPSCR_UE));
  41   if (excepts & FE_OVERFLOW)
  42     fe.l[1] |= (1 << (31 - FPSCR_OE));
  43   if (excepts & FE_INVALID)
  44     fe.l[1] |= (1 << (31 - FPSCR_VE));
  45   fesetenv_register (fe.fenv);
  46
  47   new = fegetexcept ();
  48   if (new != 0 && result == 0)
  49     (void)__fe_nomask_env ();
  50
  51   if ((new & excepts) != excepts)
  52     result = -1;
  53
  54   return result;
  55 }