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325 lines
8.7 KiB
C++
325 lines
8.7 KiB
C++
//
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// Storage.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 10/07/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef Storage_hpp
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#define Storage_hpp
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#include "../NumberTheory/Factors.hpp"
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#include <cmath>
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#include <cstdint>
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#include <limits>
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namespace Storage {
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/*!
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Contains either an absolute time or a time interval, described as a quotient, in terms of a
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clock rate to which the time is relative and its length in cycles based on that clock rate.
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*/
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struct Time {
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unsigned int length, clock_rate;
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Time() : length(0), clock_rate(1) {}
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Time(unsigned int unsigned_int_value) : length(unsigned_int_value), clock_rate(1) {}
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Time(int int_value) : Time((unsigned int)int_value) {}
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Time(unsigned int length, unsigned int clock_rate) : length(length), clock_rate(clock_rate) { simplify(); }
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Time(int length, int clock_rate) : Time((unsigned int)length, (unsigned int)clock_rate) {}
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Time(uint64_t length, uint64_t clock_rate)
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{
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install_result(length, clock_rate);
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simplify();
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}
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Time(float value)
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{
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install_float(value);
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simplify();
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}
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/*!
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Reduces this @c Time to its simplest form — eliminates all common factors from @c length
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and @c clock_rate.
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*/
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void simplify()
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{
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unsigned int common_divisor = NumberTheory::greatest_common_divisor(length, clock_rate);
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length /= common_divisor;
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clock_rate /= common_divisor;
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}
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/*!
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@returns the floating point conversion of this @c Time. This will often be less precise.
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*/
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inline float get_float() const
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{
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return (float)length / (float)clock_rate;
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}
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inline unsigned int get_unsigned_int() const
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{
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return length / clock_rate;
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}
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inline bool operator < (const Time &other) const
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{
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return (uint64_t)other.clock_rate * (uint64_t)length < (uint64_t)clock_rate * (uint64_t)other.length;
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}
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inline bool operator <= (const Time &other) const
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{
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return (uint64_t)other.clock_rate * (uint64_t)length <= (uint64_t)clock_rate * (uint64_t)other.length;
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}
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inline bool operator > (const Time &other) const
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{
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return (uint64_t)other.clock_rate * (uint64_t)length > (uint64_t)clock_rate * (uint64_t)other.length;
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}
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inline bool operator >= (const Time &other) const
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{
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return (uint64_t)other.clock_rate * (uint64_t)length >= (uint64_t)clock_rate * (uint64_t)other.length;
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}
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inline bool operator == (const Time &other) const
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{
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return (uint64_t)other.clock_rate * (uint64_t)length == (uint64_t)clock_rate * (uint64_t)other.length;
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}
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inline Time operator + (const Time &other) const
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{
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if(!other.length) return *this;
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uint64_t result_length;
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uint64_t result_clock_rate;
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if(clock_rate == other.clock_rate)
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{
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result_length = (uint64_t)length + (uint64_t)other.length;
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result_clock_rate = clock_rate;
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}
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else
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{
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result_length = (uint64_t)length * (uint64_t)other.clock_rate + (uint64_t)other.length * (uint64_t)clock_rate;
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result_clock_rate = (uint64_t)clock_rate * (uint64_t)other.clock_rate;
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}
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return Time(result_length, result_clock_rate);
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}
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inline Time &operator += (const Time &other)
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{
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if(!other.length) return *this;
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uint64_t result_length;
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uint64_t result_clock_rate;
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if(clock_rate == other.clock_rate)
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{
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result_length = (uint64_t)length + (uint64_t)other.length;
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result_clock_rate = (uint64_t)clock_rate;
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}
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else
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{
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result_length = (uint64_t)length * (uint64_t)other.clock_rate + (uint64_t)other.length * (uint64_t)clock_rate;
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result_clock_rate = (uint64_t)clock_rate * (uint64_t)other.clock_rate;
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}
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install_result(result_length, result_clock_rate);
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return *this;
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}
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inline Time operator - (const Time &other) const
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{
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if(!other.length) return *this;
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uint64_t result_length;
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uint64_t result_clock_rate;
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if(clock_rate == other.clock_rate)
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{
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result_length = (uint64_t)length - (uint64_t)other.length;
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result_clock_rate = clock_rate;
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}
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else
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{
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result_length = (uint64_t)length * (uint64_t)other.clock_rate - (uint64_t)other.length * (uint64_t)clock_rate;
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result_clock_rate = (uint64_t)clock_rate * (uint64_t)other.clock_rate;
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}
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return Time(result_length, result_clock_rate);
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}
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inline Time operator -= (const Time &other)
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{
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if(!other.length) return *this;
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uint64_t result_length;
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uint64_t result_clock_rate;
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if(clock_rate == other.clock_rate)
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{
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result_length = (uint64_t)length - (uint64_t)other.length;
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result_clock_rate = (uint64_t)clock_rate;
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}
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else
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{
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result_length = (uint64_t)length * (uint64_t)other.clock_rate - (uint64_t)other.length * (uint64_t)clock_rate;
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result_clock_rate = (uint64_t)clock_rate * (uint64_t)other.clock_rate;
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}
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install_result(result_length, result_clock_rate);
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return *this;
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}
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inline Time operator * (const Time &other) const
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{
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uint64_t result_length = (uint64_t)length * (uint64_t)other.length;
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uint64_t result_clock_rate = (uint64_t)clock_rate * (uint64_t)other.clock_rate;
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return Time(result_length, result_clock_rate);
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}
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inline Time &operator *= (const Time &other)
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{
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uint64_t result_length = (uint64_t)length * (uint64_t)other.length;
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uint64_t result_clock_rate = (uint64_t)clock_rate * (uint64_t)other.clock_rate;
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install_result(result_length, result_clock_rate);
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return *this;
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}
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inline Time operator * (unsigned int multiplier) const
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{
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uint64_t result_length = (uint64_t)length * (uint64_t)multiplier;
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uint64_t result_clock_rate = (uint64_t)clock_rate;
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return Time(result_length, result_clock_rate);
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}
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inline Time &operator *= (unsigned int multiplier)
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{
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uint64_t result_length = (uint64_t)length * (uint64_t)multiplier;
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uint64_t result_clock_rate = (uint64_t)clock_rate;
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install_result(result_length, result_clock_rate);
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return *this;
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}
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inline Time operator / (const Time &other) const
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{
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uint64_t result_length = (uint64_t)length * (uint64_t)other.clock_rate;
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uint64_t result_clock_rate = (uint64_t)clock_rate * (uint64_t)other.length;
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return Time(result_length, result_clock_rate);
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}
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inline Time &operator /= (const Time &other)
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{
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uint64_t result_length = (uint64_t)length * (uint64_t)other.clock_rate;
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uint64_t result_clock_rate = (uint64_t)clock_rate * (uint64_t)other.length;
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install_result(result_length, result_clock_rate);
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return *this;
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}
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inline Time operator / (unsigned int divisor) const
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{
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uint64_t result_length = (uint64_t)length;
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uint64_t result_clock_rate = (uint64_t)clock_rate * (uint64_t)divisor;
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return Time(result_length, result_clock_rate);
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}
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inline Time &operator /= (unsigned int divisor)
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{
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uint64_t result_length = (uint64_t)length;
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uint64_t result_clock_rate = (uint64_t)clock_rate * (uint64_t)divisor;
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install_result(result_length, result_clock_rate);
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return *this;
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}
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inline void set_zero()
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{
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length = 0;
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clock_rate = 1;
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}
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inline void set_one()
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{
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length = 1;
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clock_rate = 1;
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}
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static Time max()
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{
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return Time(std::numeric_limits<unsigned int>::max());
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}
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private:
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inline void install_result(uint64_t long_length, uint64_t long_clock_rate)
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{
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// TODO: switch to appropriate values if the result is too large or small to fit, even with trimmed accuracy.
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if(!long_length)
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{
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length = 0;
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clock_rate = 1;
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return;
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}
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while(!(long_length&1) && !(long_clock_rate&1))
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{
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long_length >>= 1;
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long_clock_rate >>= 1;
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}
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if(long_length > std::numeric_limits<unsigned int>::max() || long_clock_rate > std::numeric_limits<unsigned int>::max())
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{
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uint64_t common_divisor = NumberTheory::greatest_common_divisor(long_length, long_clock_rate);
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long_length /= common_divisor;
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long_clock_rate /= common_divisor;
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// Okay, in desperation accept a loss of accuracy.
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while(
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(long_length > std::numeric_limits<unsigned int>::max() || long_clock_rate > std::numeric_limits<unsigned int>::max()) &&
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(long_clock_rate > 1))
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{
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long_length >>= 1;
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long_clock_rate >>= 1;
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}
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}
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if(long_length <= std::numeric_limits<unsigned int>::max() && long_clock_rate <= std::numeric_limits<unsigned int>::max())
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{
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length = (unsigned int)long_length;
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clock_rate = (unsigned int)long_clock_rate;
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}
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else
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{
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length = std::numeric_limits<unsigned int>::max();
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clock_rate = 1u;
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}
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}
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inline void install_float(float value)
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{
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int exponent;
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float mantissa = frexpf(value, &exponent);
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float loaded_mantissa = ldexpf(mantissa, 24);
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uint64_t result_length;
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uint64_t result_clock_rate;
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if(exponent < 0)
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{
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int right_shift = -exponent;
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result_length = (uint64_t)loaded_mantissa >> right_shift;
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result_clock_rate = 1;
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}
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else
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{
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if(exponent <= 24)
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{
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result_length = (uint64_t)loaded_mantissa;
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result_clock_rate = 1 << (24 - exponent);
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}
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else
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{
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result_length = std::numeric_limits<uint64_t>::max();
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result_clock_rate = 1;
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}
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}
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install_result(result_length, result_clock_rate);
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}
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};
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}
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#endif /* Storage_h */
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