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dnl A function to check whether the IEEE inexact flag is supported and
dnl available to C++ programs.
dnl Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
dnl Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
dnl
dnl This file is part of the Parma Polyhedra Library (PPL).
dnl
dnl The PPL is free software; you can redistribute it and/or modify it
dnl under the terms of the GNU General Public License as published by the
dnl Free Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl The PPL is distributed in the hope that it will be useful, but WITHOUT
dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
dnl FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, write to the Free Software Foundation,
dnl Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
dnl
dnl For the most up-to-date information see the Parma Polyhedra Library
dnl site: http://www.cs.unipr.it/ppl/ .
AC_DEFUN([AC_CXX_SUPPORTS_IEEE_INEXACT_FLAG],
[
ac_save_CPPFLAGS="$CPPFLAGS"
ac_save_LIBS="$LIBS"
AC_LANG_PUSH(C++)
AC_MSG_CHECKING([whether the IEEE inexact flag is supported in C++])
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#if defined(__i386__) && (defined(__GNUC__) || defined(__INTEL_COMPILER))
int
main() {
return 0;
}
#elif defined(PPL_HAVE_IEEEFP_H) \
&& (defined(__sparc) \
|| defined(sparc) \
|| defined(__sparc__))
int
main() {
return 0;
}
#elif !defined(HAVE_FENV_H)
int
main() {
return 1;
}
#else
#include <fenv.h>
#if !defined(FE_INEXACT)
int
main() {
return 1;
}
#else // defined(FE_INEXACT)
struct A {
double dividend;
double divisor;
bool inexact;
} a[] = {
{ 1.0, 2.0, false },
{ 2.0, 3.0, true },
};
int main() {
for (unsigned i = 0; i < sizeof(a)/sizeof(a[0]); ++i) {
{
volatile float x = a[i].dividend;
volatile float y = a[i].divisor;
feclearexcept(FE_INEXACT);
x = x / y;
if ((fetestexcept(FE_INEXACT) != 0) != a[i].inexact)
return 1;
}
{
volatile double x = a[i].dividend;
volatile double y = a[i].divisor;
feclearexcept(FE_INEXACT);
x = x / y;
if ((fetestexcept(FE_INEXACT) != 0) != a[i].inexact)
return 1;
}
{
volatile long double x = a[i].dividend;
volatile long double y = a[i].divisor;
feclearexcept(FE_INEXACT);
x = x / y;
if ((fetestexcept(FE_INEXACT) != 0) != a[i].inexact)
return 1;
}
}
return 0;
}
#endif // defined(FE_INEXACT)
#endif
]])],
AC_MSG_RESULT(yes)
ac_cxx_supports_ieee_inexact_flag=yes,
AC_MSG_RESULT(no)
ac_cxx_supports_ieee_inexact_flag=no,
AC_MSG_RESULT([assuming not])
ac_cxx_supports_ieee_inexact_flag=no)
if test x"$ac_cxx_supports_ieee_inexact_flag" = xyes
then
value=1
else
value=0
fi
AC_DEFINE_UNQUOTED(PPL_CXX_SUPPORTS_IEEE_INEXACT_FLAG, $value,
[Not zero if the the IEEE inexact flag is supported in C++.])
AC_LANG_POP(C++)
CPPFLAGS="$ac_save_CPPFLAGS"
LIBS="$ac_save_LIBS"
])
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