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153 | /* *****************************************************************
MESQUITE -- The Mesh Quality Improvement Toolkit
Copyright 2005 Lawrence Livermore National Laboratory. Under
the terms of Contract B545069 with the University of Wisconsin --
Madison, Lawrence Livermore National Laboratory retains certain
rights in this software.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
(lgpl.txt) along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
[email protected]
***************************************************************** */
#include "MsqFPE.hpp"
/* First check for BSD-style fpsetmask, which is the closest
to a standard across unix-like OSs */
#if defined( HAVE_FPSETMASK )
#include <ieeefp.h>
bool MBMesquite::MsqFPE::fpe_trap_supported()
{
return true;
}
int MBMesquite::MsqFPE::get_current_fpe_state()
{
return fpgetmask();
}
void MBMesquite::MsqFPE::set_current_fpe_state( int state )
{
fpsetmask( state );
}
void MBMesquite::MsqFPE::enable_trap_fpe()
{
fpsetmask( fpgetmask() | FP_X_INV | FP_X_OFL | FP_X_DZ );
}
/* Next try GNU-C feenableexcept mechanism */
#elif defined( HAVE_FEENABLEEXCEPT )
#ifndef _GNU_SOURCE
#define MSQ_SET_GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <fenv.h>
#ifdef MSQ_SET_GNU_SOURCE
#undef _GNU_SOURCE
#undef MSQ_SET_GNU_SOURCE
#endif
bool MBMesquite::MsqFPE::fpe_trap_supported()
{
return true;
}
int MBMesquite::MsqFPE::get_current_fpe_state()
{
return fegetexcept();
}
void MBMesquite::MsqFPE::set_current_fpe_state( int state )
{
feenableexcept( state );
}
void MBMesquite::MsqFPE::enable_trap_fpe()
{
const int flags = FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW;
feclearexcept( flags );
feenableexcept( flags );
}
/* Next try Microsoft */
#elif defined( _WIN32 )
#include <float.h>
bool MBMesquite::MsqFPE::fpe_trap_supported()
{
return true;
}
int MBMesquite::MsqFPE::get_current_fpe_state()
{
return _controlfp( 0, 0 );
}
void MBMesquite::MsqFPE::set_current_fpe_state( int state )
{
_controlfp( state, _MCW_EM );
}
void MBMesquite::MsqFPE::enable_trap_fpe()
{
const int flags = _EM_ZERODIVIDE | _EM_INVALID | _EM_OVERFLOW;
_controlfp( ~flags, _MCW_EM );
}
/* Unsupported platform */
#else
bool MBMesquite::MsqFPE::fpe_trap_supported()<--- The function 'fpe_trap_supported' is never used.
{
return false;
}
int MBMesquite::MsqFPE::get_current_fpe_state()
{
return 0;
}
void MBMesquite::MsqFPE::set_current_fpe_state( int ) {}
void MBMesquite::MsqFPE::enable_trap_fpe() {}
#endif
MBMesquite::MsqFPE::MsqFPE( bool enabled ) : isEnabled( enabled )
{
if( isEnabled )
{
prevState = get_current_fpe_state();
enable_trap_fpe();
}
}
MBMesquite::MsqFPE::~MsqFPE()
{
if( isEnabled )
{
set_current_fpe_state( prevState );
}
}
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