| /* 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 */ |