sysdeps/ia64/fpu/fesetround.c

   1 /* Set current rounding direction.
   2    Copyright (C) 1999-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Christian Boissat <Christian.Boissat@cern.ch>, 1999.
   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
  22 int
  23 fesetround (int round)
  24 {
  25   fenv_t fpsr;
  26
  27   if (round & ~3)
  28     return 1;
  29
  30   /* Get the current state.  */
  31   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (fpsr));
  32
  33   /* Set the relevant bits.  */
  34   fpsr = (fpsr & ~(3UL << 10)) | ((fenv_t) round << 10);
  35
  36   /* Put the new state in effect.  */
  37   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (fpsr) : "memory");
  38
  39   return 0;
  40 }
  41 libm_hidden_def (fesetround)