libm/metag/feupdateenv.c

   1 /* Install given floating-point environment and raise exceptions.
   2    Copyright (C) 2013 Imagination Technologies Ltd.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If
  17    not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv.h>
  20 #include <unistd.h>
  21
  22 libm_hidden_proto(fesetenv)
  23 libm_hidden_proto(feraiseexcept)
  24
  25 int
  26 feupdateenv (const fenv_t *envp)
  27 {
  28   unsigned int temp;
  29
  30   /* Save current exceptions.  */
  31   __asm__ ("MOV %0,TXDEFR" : "=r" (temp));
  32
  33   temp >>= 16;
  34   temp &= FE_ALL_EXCEPT;
  35
  36   /* Install new environment.  */
  37   fesetenv (envp);
  38
  39   /* Raise the saved exception.  */
  40   feraiseexcept ((int) temp);
  41
  42   /* Success.  */
  43   return 0;
  44 }