sysdeps/hppa/fpu/fesetround.c

   1 /* Set current rounding direction.
   2    Copyright (C) 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by David Huggins-Daines <dhd@debian.org>, 2000
   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
  23 int
  24 fesetround (int round)
  25 {
  26   union { unsigned long long l; unsigned int sw[2]; } s;
  27
  28   if (round & ~FE_DOWNWARD)
  29     /* round is not a valid rounding mode. */
  30     return 1;
  31
  32   /* Get the current status word. */
  33   __asm__ ("fstd %%fr0,0(%1)" : "=m" (s.l) : "r" (&s.l) : "%r0");
  34   s.sw[0] &= ~FE_DOWNWARD;
  35   s.sw[0] |= round & FE_DOWNWARD;
  36   __asm__ ("fldd 0(%0),%%fr0" : : "r" (&s.l), "m" (s.l) : "%r0");
  37
  38   return 0;
  39 }
  40
  41 libm_hidden_def (fesetround)