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glibc  2.9
fesetround.c
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00001 /* Set current rounding direction.
00002    Copyright (C) 2000, 2005 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com).
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <fenv_libc.h>
00022 #include <fpu_control.h>
00023 
00024 int
00025 fesetround (int round)
00026 {
00027   if ((round|FPC_RM_MASK) != FPC_RM_MASK)
00028     {
00029       /* ROUND is not a valid rounding mode.  */
00030       return 1;
00031     }
00032   __asm__ volatile ("srnm 0(%0)"
00033                   :
00034                   : "a" (round));
00035 
00036   return 0;
00037 }
00038 libm_hidden_def (fesetround)