ports/sysdeps/arm/fesetround.c

   1 /* Set current rounding direction.
   2    Copyright (C) 2004-2014 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 fesetround (int round)
  26 {
  27   if (ARM_HAVE_VFP)
  28     {
  29       fpu_control_t temp;
  30
  31       switch (round)
  32         {
  33         case FE_TONEAREST:
  34         case FE_UPWARD:
  35         case FE_DOWNWARD:
  36         case FE_TOWARDZERO:
  37           _FPU_GETCW (temp);
  38           temp = (temp & ~FE_TOWARDZERO) | round;
  39           _FPU_SETCW (temp);
  40           return 0;
  41         default:
  42           return 1;
  43         }
  44     }
  45   else if (round == FE_TONEAREST)
  46     /* This is the only supported rounding mode for soft-fp.  */
  47     return 0;
  48
  49   /* Unsupported, so fail.  */
  50   return 1;
  51 }
  52
  53 libm_hidden_def (fesetround)