sysdeps/powerpc/fpu/fedisblxcpt.c

   1 /* Disable floating-point exceptions.
   2    Copyright (C) 2000-2019 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    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv_libc.h>
  21
  22 int
  23 fedisableexcept (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_control ();
  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   new = fenv_exceptions_to_reg (excepts);
  36
  37   if (fenv_reg_to_exceptions (new) != excepts)
  38     return -1;
  39
  40   /* Sets the new exception mask.  */
  41   fe.l &= ~new;
  42
  43   if (fe.l != curr.l)
  44     fesetenv_control (fe.fenv);
  45
  46   __TEST_AND_ENTER_NON_STOP (-1ULL, fe.l);
  47
  48   return result;
  49 }