boost/numeric/interval/detail/sparc_rounding_control.hpp
/* Boost interval/detail/sparc_rounding_control.hpp file
*
* Copyright 2000 Jens Maurer
* Copyright 2002 Herv� Br�nnimann, Guillaume Melquiond, Sylvain Pion
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or
* copy at http://www.boost.org/LICENSE_1_0.txt)
*
* The basic code in this file was kindly provided by Jeremy Siek.
*/
#ifndef BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP
#define BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP
#if !defined(sparc) && !defined(__sparc__)
# error This header is only intended for SPARC CPUs.
#endif
#ifdef __SUNPRO_CC
# include <ieeefp.h>
#endif
namespace boost {
namespace numeric {
namespace interval_lib {
namespace detail {
struct sparc_rounding_control
{
typedef unsigned int rounding_mode;
static void set_rounding_mode(const rounding_mode& mode)
{
# if defined(__GNUC__)
__asm__ __volatile__("ld %0, %%fsr" : : "m"(mode));
# elif defined (__SUNPRO_CC)
fpsetround(fp_rnd(mode));
# elif defined(__KCC)
asm("sethi %hi(mode), %o1");
asm("ld [%o1+%lo(mode)], %fsr");
# else
# error Unsupported compiler for Sparc rounding control.
# endif
}
static void get_rounding_mode(rounding_mode& mode)
{
# if defined(__GNUC__)
__asm__ __volatile__("st %%fsr, %0" : "=m"(mode));
# elif defined (__SUNPRO_CC)
mode = fpgetround();
# elif defined(__KCC)
# error KCC on Sun SPARC get_round_mode: please fix me
asm("st %fsr, [mode]");
# else
# error Unsupported compiler for Sparc rounding control.
# endif
}
#if defined(__SUNPRO_CC)
static void downward() { set_rounding_mode(FP_RM); }
static void upward() { set_rounding_mode(FP_RP); }
static void to_nearest() { set_rounding_mode(FP_RN); }
static void toward_zero() { set_rounding_mode(FP_RZ); }
#else
static void downward() { set_rounding_mode(0xc0000000); }
static void upward() { set_rounding_mode(0x80000000); }
static void to_nearest() { set_rounding_mode(0x00000000); }
static void toward_zero() { set_rounding_mode(0x40000000); }
#endif
};
} // namespace detail
extern "C" {
float rintf(float);
double rint(double);
}
template<>
struct rounding_control<float>:
detail::sparc_rounding_control
{
static const float& force_rounding(const float& x) { return x; }
static float to_int(const float& x) { return rintf(x); }
};
template<>
struct rounding_control<double>:
detail::sparc_rounding_control
{
static const double& force_rounding(const double& x) { return x; }
static double to_int(const double& x) { return rint(x); }
};
template<>
struct rounding_control<long double>:
detail::sparc_rounding_control
{
static const long double& force_rounding(const long double& x) { return x; }
static long double to_int(const long double& x) { return rint(x); }
};
} // namespace interval_lib
} // namespace numeric
} // namespace boost
#undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE
#endif /* BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP */