sysdeps/mips/fpu/fesetround.c

   1 /* Set current rounding direction.
   2    Copyright (C) 1998 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <fenv.h>
  22 #include <fpu_control.h>
  23
  24 int
  25 fesetround (int round)
  26 {
  27   unsigned short int cw;
  28
  29   if ((round & ~0x3) != 0)
  30     /* ROUND is no valid rounding mode.  */
  31     return 1;
  32
  33   /* Get current state.  */
  34   _FPU_GETCW (cw);
  35
  36   /* Set rounding bits.  */
  37   cw &= ~0x3;
  38   cw |= round;
  39   /* Set new state.  */
  40   _FPU_SETCW (cw);
  41
  42   return 0;
  43 }