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glibc  2.9
feholdexcpt.c
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00001 /* Store current floating-point environment and clear exceptions.
00002    Copyright (C) 1997, 1999, 2000, 2005, 2007 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Christian Boissat <Christian.Boissat@cern.ch>, 1999
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 feholdexcept (fenv_t *envp)
00025 {
00026   fenv_t fpsr;
00027   /* Save the current state.  */
00028   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (fpsr));
00029   *envp = fpsr;
00030 
00031   /* Set the trap disable bits.  */
00032   fpsr |= FE_ALL_EXCEPT;
00033 
00034   /* And clear the exception bits.  */
00035   fpsr &= ~(fenv_t) (FE_ALL_EXCEPT << 13);
00036 
00037   __asm__ __volatile__ ("mov.m ar.fpsr=%0" :: "r" (fpsr));
00038 
00039   /* Success.  */
00040   return 0;
00041 }
00042 libm_hidden_def (feholdexcept)