libm/nds32/fedisblxcpt.c

   1 /*
   2  * Copyright (C) 2016-2017 Andes Technology, Inc.
   3  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   4  */
   5
   6 /* Disable floating-point exceptions.
   7    Copyright (C) 2001-2013 Free Software Foundation, Inc.
   8    Contributed by Philip Blundell <philb@gnu.org>, 2001.
   9
  10    The GNU C Library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 2.1 of the License, or (at your option) any later version.
  14
  15    The GNU C Library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with the GNU C Library.  If not, see
  22    <http://www.gnu.org/licenses/>.  */
  23
  24 #include <fenv.h>
  25 #include "fenv_libc.h"
  26 #include <fpu_control.h>
  27
  28 int
  29 fedisableexcept (int excepts)
  30 {
  31 #ifdef __NDS32_ABI_2FP_PLUS__
  32         unsigned long int new_exc, old_exc;
  33
  34         _FPU_GETCW(new_exc);
  35
  36         old_exc = (new_exc & ENABLE_MASK) >> ENABLE_SHIFT;
  37
  38         excepts &= FE_ALL_EXCEPT;
  39
  40         new_exc &= ~(excepts << ENABLE_SHIFT);
  41         new_exc &= ~_FPU_RESERVED;
  42         _FPU_SETCW (new_exc);
  43
  44         return old_exc;
  45 #else
  46         /* Unsupported, so return -1 for failure.  */
  47         return -1;
  48 #endif
  49 }