sysdeps/powerpc/fpu/feenablxcpt.c

   1 /* Enable floating-point exceptions.
   2    Copyright (C) 2000-2017 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv_libc.h>
  21
  22 int
  23 feenableexcept (int excepts)
  24 {
  25   fenv_union_t fe, curr;
  26   int result, new;
  27
  28   /* Get current exception mask to return.  */
  29   fe.fenv = curr.fenv = fegetenv_register ();
  30   result = fenv_reg_to_exceptions (fe.l);
  31
  32   if ((excepts & FE_ALL_INVALID) == FE_ALL_INVALID)
  33     excepts = (excepts | FE_INVALID) & ~ FE_ALL_INVALID;
  34
  35   /* Sets the new exception mask.  */
  36   if (excepts & FE_INEXACT)
  37     fe.l |= (1 << (31 - FPSCR_XE));
  38   if (excepts & FE_DIVBYZERO)
  39     fe.l |= (1 << (31 - FPSCR_ZE));
  40   if (excepts & FE_UNDERFLOW)
  41     fe.l |= (1 << (31 - FPSCR_UE));
  42   if (excepts & FE_OVERFLOW)
  43     fe.l |= (1 << (31 - FPSCR_OE));
  44   if (excepts & FE_INVALID)
  45     fe.l |= (1 << (31 - FPSCR_VE));
  46
  47   if (fe.l != curr.l)
  48     fesetenv_register (fe.fenv);
  49
  50   new = __fegetexcept ();
  51   if (new != 0 && result == 0)
  52     (void) __fe_nomask_env_priv ();
  53
  54   if ((new & excepts) != excepts)
  55     result = -1;
  56
  57   return result;
  58 }