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112 lines
3.0 KiB
112 lines
3.0 KiB
/* 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 Hervé Brönnimann, 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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