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My thinking here is that for really simple processors there'll be 256 or less, meaning that they can be stored by simple uint8_t; for every other processor I can currently think of it'll likely be uint16_t. Either way, that's a much better outcome than using plain pointers, which on architectures I currently build for will always be 8 bytes. For the simple processors I can get eight times as much into the cache; for the others four times.
66 lines
1.5 KiB
C++
66 lines
1.5 KiB
C++
//
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// CachingExecutor.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 16/01/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#ifndef CachingExecutor_hpp
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#define CachingExecutor_hpp
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#include <array>
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#include <cstdint>
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#include <limits>
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namespace InstructionSet {
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/*!
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Maps to the smallest of the following integers that can contain max_value:
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* uint8_t;
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* uint16_t;
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* uint32_t; or
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* uint64_t.
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*/
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template <uint64_t max_value> struct MinIntTypeValue {
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using type =
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std::conditional_t<
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max_value <= std::numeric_limits<uint8_t>::max(), uint8_t,
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std::conditional_t<
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max_value <= std::numeric_limits<uint16_t>::max(), uint16_t,
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std::conditional_t<
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max_value <= std::numeric_limits<uint32_t>::max(), uint32_t,
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uint64_t
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>
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>
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>;
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};
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template <
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/// Indicates the Executor for this platform.
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typename Executor,
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/// Indicates the greatest value the program counter might take.
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uint64_t max_address,
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/// Indicates the maximum number of potential performers that will be provided.
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uint64_t max_performer_count,
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/// Indicates whether performers will acess their decoded instructions; if @c false then instructions are not retained.
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bool keep_instruction_structs
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> class CachingExecutor {
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public:
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protected:
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using Performer = void (*)(Executor *);
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std::array<Performer, max_performer_count> performers_;
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typename MinIntTypeValue<max_address>::type program_counter_;
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private:
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typename MinIntTypeValue<max_performer_count>::type actions_[100];
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};
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}
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#endif /* CachingExecutor_hpp */
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