sysdeps/arm/eabi/fesetround.c

   1 /* Set current rounding direction.
   2    Copyright (C) 2004, 2005 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 General Public License
  16    along with GCC; see the file COPYING.  If not, write to the Free
  17    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  18    02110-1301, USA.  */
  19
  20 #include <fenv.h>
  21 #include <fpu_control.h>
  22
  23 #include <unistd.h>
  24 #include <ldsodefs.h>
  25 #include <dl-procinfo.h>
  26 #include <sysdep.h>
  27
  28 int
  29 fesetround (int round)
  30 {
  31   if (GLRO (dl_hwcap) & HWCAP_ARM_VFP)
  32     {
  33       fpu_control_t temp;
  34
  35       switch (round)
  36         {
  37         case FE_TONEAREST:
  38         case FE_UPWARD:
  39         case FE_DOWNWARD:
  40         case FE_TOWARDZERO:
  41           _FPU_GETCW (temp);
  42           temp = (temp & ~FE_TOWARDZERO) | round;
  43           _FPU_SETCW (temp);
  44           return 0;
  45         default:
  46           return 1;
  47         }
  48     }
  49   else if (round == FE_TONEAREST)
  50     /* This is the only supported rounding mode for soft-fp.  */
  51     return 0;
  52
  53   /* Unsupported, so fail.  */
  54   return 1;
  55 }
  56
  57 libm_hidden_def (fesetround)