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- /* Boost interval/detail/sparc_rounding_control.hpp file
- *
- * Copyright 2000 Jens Maurer
- * Copyright 2002 Hervé Brönnimann, 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 */
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