ports/sysdeps/arm/feholdexcpt.c

   1 /* Store current floating-point environment and clear exceptions.
   2    Copyright (C) 1997-2014 Free Software Foundation, Inc.
   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.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <fenv.h>
  20 #include <fpu_control.h>
  21 #include <arm-features.h>
  22
  23
  24 int
  25 feholdexcept (fenv_t *envp)
  26 {
  27   if (ARM_HAVE_VFP)
  28     {
  29       unsigned long int temp;
  30
  31       /* Store the environment.  */
  32       _FPU_GETCW(temp);
  33       envp->__cw = temp;
  34
  35       /* Now set all exceptions to non-stop.  */
  36       temp &= ~(FE_ALL_EXCEPT << FE_EXCEPT_SHIFT);
  37
  38       /* And clear all exception flags.  */
  39       temp &= ~FE_ALL_EXCEPT;
  40
  41       _FPU_SETCW(temp);
  42
  43       return 0;
  44     }
  45
  46   /* Unsupported, so fail.  */
  47   return 1;
  48 }
  49
  50 libm_hidden_def (feholdexcept)