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glibc  2.9
feenablxcpt.c
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00001 /* Enable floating-point exceptions.
00002    Copyright (C) 2000 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Jes Sorensen <Jes.Sorensen@cern.ch>, 2000.
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.h>
00022 
00023 int
00024 feenableexcept (int excepts)
00025 {
00026   fenv_t old_fpsr;
00027   fenv_t new_fpsr;
00028 
00029   /* Get the current fpsr.  */
00030   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (old_fpsr));
00031 
00032   new_fpsr = old_fpsr & ~((fenv_t) excepts & FE_ALL_EXCEPT);
00033 
00034   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (new_fpsr) : "memory");
00035 
00036   return (old_fpsr ^ FE_ALL_EXCEPT) & FE_ALL_EXCEPT;
00037 }