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alpha_rounding_control.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\numeric\interval\detail\alpha_rounding_control.hpp
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/* Boost interval/detail/alpha_rounding_control.hpp file * * Copyright 2005 Felix H�fling, Guillaume Melquiond * * 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) */ #ifndef BOOST_NUMERIC_INTERVAL_DETAIL_ALPHA_ROUNDING_CONTROL_HPP #define BOOST_NUMERIC_INTERVAL_DETAIL_ALPHA_ROUNDING_CONTROL_HPP #if !defined(alpha) && !defined(__alpha__) #error This header only works on Alpha CPUs. #endif #if defined(__GNUC__) || defined(__digital__) || defined(__DECCXX) #include
// write_rnd() and read_rnd() namespace boost { namespace numeric { namespace interval_lib { namespace detail { #if defined(__GNUC__ ) typedef union { ::boost::long_long_type imode; double dmode; } rounding_mode_struct; // set bits 59-58 (DYN), // clear all exception bits and disable overflow (51) and inexact exceptions (62) static const rounding_mode_struct mode_upward = { 0x4C08000000000000LL }; static const rounding_mode_struct mode_downward = { 0x4408000000000000LL }; static const rounding_mode_struct mode_to_nearest = { 0x4808000000000000LL }; static const rounding_mode_struct mode_toward_zero = { 0x4008000000000000LL }; struct alpha_rounding_control { typedef double rounding_mode; static void set_rounding_mode(const rounding_mode mode) { __asm__ __volatile__ ("mt_fpcr %0" : : "f"(mode)); } static void get_rounding_mode(rounding_mode& mode) { __asm__ __volatile__ ("mf_fpcr %0" : "=f"(mode)); } static void downward() { set_rounding_mode(mode_downward.dmode); } static void upward() { set_rounding_mode(mode_upward.dmode); } static void to_nearest() { set_rounding_mode(mode_to_nearest.dmode); } static void toward_zero() { set_rounding_mode(mode_toward_zero.dmode); } }; #elif defined(__digital__) || defined(__DECCXX) #if defined(__DECCXX) && !(defined(__FLT_ROUNDS) && __FLT_ROUNDS == -1) #error Dynamic rounding mode not enabled. See cxx man page for details. #endif struct alpha_rounding_control { typedef unsigned int rounding_mode; static void set_rounding_mode(const rounding_mode& mode) { write_rnd(mode); } static void get_rounding_mode(rounding_mode& mode) { mode = read_rnd(); } static void downward() { set_rounding_mode(FP_RND_RM); } static void upward() { set_rounding_mode(FP_RND_RP); } static void to_nearest() { set_rounding_mode(FP_RND_RN); } static void toward_zero() { set_rounding_mode(FP_RND_RZ); } }; #endif } // namespace detail extern "C" { float rintf(float); double rint(double); long double rintl(long double); } template<> struct rounding_control
: detail::alpha_rounding_control { static float force_rounding(const float r) { volatile float _r = r; return _r; } static float to_int(const float& x) { return rintf(x); } }; template<> struct rounding_control
: detail::alpha_rounding_control { static const double & force_rounding(const double& r) { return r; } static double to_int(const double& r) { return rint(r); } }; template<> struct rounding_control
: detail::alpha_rounding_control { static const long double & force_rounding(const long double& r) { return r; } static long double to_int(const long double& r) { return rintl(r); } }; } // namespace interval_lib } // namespace numeric } // namespace boost #undef BOOST_NUMERIC_INTERVAL_NO_HARDWARE #endif #endif /* BOOST_NUMERIC_INTERVAL_DETAIL_ALPHA_ROUNDING_CONTROL_HPP */
alpha_rounding_control.hpp
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