sysdeps/arm/fsetexcptflg.c

   1 /* Set floating-point environment exception handling.
   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 <math.h>
  21 #include <fpu_control.h>
  22 #include <arm-features.h>
  23
  24
  25 int
  26 fesetexceptflag (const fexcept_t *flagp, int excepts)
  27 {
  28   fpu_control_t fpscr;
  29
  30   /* Fail if a VFP unit isn't present unless nothing needs to be done.  */
  31   if (!ARM_HAVE_VFP)
  32     return (excepts != 0);
  33
  34   _FPU_GETCW (fpscr);
  35
  36   /* Set the desired exception mask.  */
  37   fpscr &= ~(excepts & FE_ALL_EXCEPT);
  38   fpscr |= (*flagp & excepts & FE_ALL_EXCEPT);
  39
  40   /* Save state back to the FPU.  */
  41   _FPU_SETCW (fpscr);
  42   return 0;
  43 }