113 lines
3.1 KiB
Plaintext
113 lines
3.1 KiB
Plaintext
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/* Boost interval/detail/sparc_rounding_control.hpp file
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*
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* Copyright 2000 Jens Maurer
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* Copyright 2002 Herv<72> Br<42>nnimann, Guillaume Melquiond, Sylvain Pion
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*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or
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* copy at http://www.boost.org/LICENSE_1_0.txt)
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*
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* The basic code in this file was kindly provided by Jeremy Siek.
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*/
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#ifndef BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP
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#define BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP
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#if !defined(sparc) && !defined(__sparc__)
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# error This header is only intended for SPARC CPUs.
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#endif
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#ifdef __SUNPRO_CC
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# include <ieeefp.h>
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#endif
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namespace boost {
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namespace numeric {
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namespace interval_lib {
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namespace detail {
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struct sparc_rounding_control
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{
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typedef unsigned int rounding_mode;
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static void set_rounding_mode(const rounding_mode& mode)
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{
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# if defined(__GNUC__)
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__asm__ __volatile__("ld %0, %%fsr" : : "m"(mode));
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# elif defined (__SUNPRO_CC)
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fpsetround(fp_rnd(mode));
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# elif defined(__KCC)
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asm("sethi %hi(mode), %o1");
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asm("ld [%o1+%lo(mode)], %fsr");
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# else
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# error Unsupported compiler for Sparc rounding control.
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# endif
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}
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static void get_rounding_mode(rounding_mode& mode)
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{
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# if defined(__GNUC__)
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__asm__ __volatile__("st %%fsr, %0" : "=m"(mode));
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# elif defined (__SUNPRO_CC)
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mode = fpgetround();
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# elif defined(__KCC)
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# error KCC on Sun SPARC get_round_mode: please fix me
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asm("st %fsr, [mode]");
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# else
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# error Unsupported compiler for Sparc rounding control.
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# endif
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}
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#if defined(__SUNPRO_CC)
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static void downward() { set_rounding_mode(FP_RM); }
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static void upward() { set_rounding_mode(FP_RP); }
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static void to_nearest() { set_rounding_mode(FP_RN); }
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static void toward_zero() { set_rounding_mode(FP_RZ); }
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#else
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static void downward() { set_rounding_mode(0xc0000000); }
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static void upward() { set_rounding_mode(0x80000000); }
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static void to_nearest() { set_rounding_mode(0x00000000); }
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static void toward_zero() { set_rounding_mode(0x40000000); }
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#endif
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};
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} // namespace detail
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extern "C" {
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float rintf(float);
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double rint(double);
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}
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template<>
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struct rounding_control<float>:
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detail::sparc_rounding_control
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{
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static const float& force_rounding(const float& x) { return x; }
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static float to_int(const float& x) { return rintf(x); }
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};
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template<>
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struct rounding_control<double>:
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detail::sparc_rounding_control
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{
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static const double& force_rounding(const double& x) { return x; }
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static double to_int(const double& x) { return rint(x); }
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};
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template<>
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struct rounding_control<long double>:
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detail::sparc_rounding_control
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{
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static const long double& force_rounding(const long double& x) { return x; }
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static long double to_int(const long double& x) { return rint(x); }
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};
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} // namespace interval_lib
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} // namespace numeric
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} // namespace boost
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#undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE
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#endif /* BOOST_NUMERIC_INTERVAL_DETAIL_SPARC_ROUNDING_CONTROL_HPP */
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