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glibc  2.9
fclrexcpt.c
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00001 /* Clear given exceptions in current floating-point environment.
00002    Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Christian Boissat <Christian.Boissat@cern.ch>, 1999 and
00005                   Jes Sorensen <Jes.Sorensen@cern.ch>, 2000
00006 
00007    The GNU C Library is free software; you can redistribute it and/or
00008    modify it under the terms of the GNU Lesser General Public
00009    License as published by the Free Software Foundation; either
00010    version 2.1 of the License, or (at your option) any later version.
00011 
00012    The GNU C Library is distributed in the hope that it will be useful,
00013    but WITHOUT ANY WARRANTY; without even the implied warranty of
00014    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015    Lesser General Public License for more details.
00016 
00017    You should have received a copy of the GNU Lesser General Public
00018    License along with the GNU C Library; if not, write to the Free
00019    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00020    02111-1307 USA.  */
00021 
00022 #include <fenv.h>
00023 
00024 int
00025 feclearexcept (int excepts)
00026 {
00027   fenv_t fpsr;
00028 
00029   /* Get the current state.  */
00030   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (fpsr));
00031 
00032   /* Clear the relevant bits.  */
00033   fpsr &= ~(((fenv_t) ((excepts & FE_ALL_EXCEPT) << 13)));
00034   /* Put the new state in effect.  */
00035   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (fpsr) : "memory");
00036 
00037   /* success */
00038   return 0;
00039 }