sysdeps/sh/sh4/fpu/fesetround.c

   1 /* Set current rounding direction.
   2    Copyright (C) 1998-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Andreas Jaeger <aj@arthur.rhein-neckar.de>, 1998.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <fenv.h>
  21 #include <fpu_control.h>
  22
  23 int
  24 fesetround (int round)
  25 {
  26   fpu_control_t cw;
  27
  28   if ((round & ~0x1) != 0)
  29     /* ROUND is no valid rounding mode.  */
  30     return 1;
  31
  32   /* Get current state.  */
  33   _FPU_GETCW (cw);
  34
  35   /* Set rounding bits.  */
  36   cw &= ~0x1;
  37   cw |= round;
  38   /* Set new state.  */
  39   _FPU_SETCW (cw);
  40
  41   return 0;
  42 }
  43 libm_hidden_def (fesetround)