sysdeps/aarch64/fpu/fesetround.c

   1 /* Copyright (C) 1997-2014 Free Software Foundation, Inc.
   2
   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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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
  22 int
  23 fesetround (int round)
  24 {
  25   fpu_control_t fpcr;
  26   fpu_control_t fpcr_new;
  27
  28   switch (round)
  29     {
  30     case FE_TONEAREST:
  31     case FE_UPWARD:
  32     case FE_DOWNWARD:
  33     case FE_TOWARDZERO:
  34       _FPU_GETCW (fpcr);
  35       fpcr_new = (fpcr & ~FE_TOWARDZERO) | round;
  36
  37       if (fpcr != fpcr_new)
  38         _FPU_SETCW (fpcr_new);
  39       return 0;
  40
  41     default:
  42       return 1;
  43     }
  44
  45   return 1;
  46 }
  47 libm_hidden_def (fesetround)