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Seeks to switch to maintaining a bank of performers.

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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.
This commit is contained in:
Thomas Harte 2021-01-17 19:38:23 -05:00
parent 5f413a38df
commit 17c3a3eb4b
2 changed files with 44 additions and 5 deletions
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45
InstructionSets/CachingExecutor.hpp
View File

@ -9,16 +9,55 @@
#ifndef CachingExecutor_hpp
#define CachingExecutor_hpp
#include <array>
#include <cstdint>
#include <limits>
namespace InstructionSet {
template <typename Executor, typename Action, typename AddressType, AddressType MaxAddress> class CachingExecutor {
/*!
Maps to the smallest of the following integers that can contain max_value:
* uint8_t;
* uint16_t;
* uint32_t; or
* uint64_t.
*/
template <uint64_t max_value> struct MinIntTypeValue {
using type =
std::conditional_t<
max_value <= std::numeric_limits<uint8_t>::max(), uint8_t,
std::conditional_t<
max_value <= std::numeric_limits<uint16_t>::max(), uint16_t,
std::conditional_t<
max_value <= std::numeric_limits<uint32_t>::max(), uint32_t,
uint64_t
>
>
>;
};
template <
/// Indicates the Executor for this platform.
typename Executor,
/// Indicates the greatest value the program counter might take.
uint64_t max_address,
/// Indicates the maximum number of potential performers that will be provided.
uint64_t max_performer_count,
/// Indicates whether performers will acess their decoded instructions; if @c false then instructions are not retained.
bool keep_instruction_structs
> class CachingExecutor {
public:
protected:
AddressType program_counter_;
using Performer = void (*)(Executor *);
std::array<Performer, max_performer_count> performers_;
typename MinIntTypeValue<max_address>::type program_counter_;
private:
Action actions_[100]; // TODO: just a test declaration; these actually need to be bucketed by page, etc.
typename MinIntTypeValue<max_performer_count>::type actions_[100];
};
}

4
InstructionSets/M50740/Executor.hpp
View File

@ -29,11 +29,11 @@ struct Action {
inline Action(Performer performer) noexcept : perform(performer) {}
};
class Executor: public CachingExecutor<Executor, Action, uint16_t, 0x2000> {
class Executor: public CachingExecutor<Executor, 0x2000, 256, false> {
public:
private:
friend CachingExecutor<Executor, Action, uint16_t, 0x2000>;
friend CachingExecutor<Executor, 0x2000, 256, false>;
Action action_for(Instruction);
/*!