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74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2016 MerryMage
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* SPDX-License-Identifier: 0BSD
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*
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* Original version of table by Lioncash.
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*/
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#pragma once
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#include <algorithm>
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#include <functional>
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#include <optional>
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#include <vector>
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#include <mcl/bit/bit_count.hpp>
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#include <mcl/stdint.hpp>
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#include "dynarmic/frontend/decoder/decoder_detail.h"
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#include "dynarmic/frontend/decoder/matcher.h"
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namespace Dynarmic::A32 {
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template<typename Visitor>
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using ArmMatcher = Decoder::Matcher<Visitor, u32>;
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template<typename Visitor>
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using ArmDecodeTable = std::array<std::vector<ArmMatcher<Visitor>>, 0x1000>;
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namespace detail {
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inline size_t ToFastLookupIndexArm(u32 instruction) {
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return ((instruction >> 4) & 0x00F) | ((instruction >> 16) & 0xFF0);
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}
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} // namespace detail
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template<typename V>
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ArmDecodeTable<V> GetArmDecodeTable() {
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std::vector<ArmMatcher<V>> list = {
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#define INST(fn, name, bitstring) DYNARMIC_DECODER_GET_MATCHER(ArmMatcher, fn, name, Decoder::detail::StringToArray<32>(bitstring)),
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#include "./arm.inc"
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#undef INST
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};
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// If a matcher has more bits in its mask it is more specific, so it should come first.
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std::stable_sort(list.begin(), list.end(), [](const auto& matcher1, const auto& matcher2) {
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return mcl::bit::count_ones(matcher1.GetMask()) > mcl::bit::count_ones(matcher2.GetMask());
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});
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ArmDecodeTable<V> table{};
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for (size_t i = 0; i < table.size(); ++i) {
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for (auto matcher : list) {
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const auto expect = detail::ToFastLookupIndexArm(matcher.GetExpected());
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const auto mask = detail::ToFastLookupIndexArm(matcher.GetMask());
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if ((i & mask) == expect) {
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table[i].push_back(matcher);
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}
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}
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}
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return table;
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}
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template<typename V>
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std::optional<std::reference_wrapper<const ArmMatcher<V>>> DecodeArm(u32 instruction) {
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static const auto table = GetArmDecodeTable<V>();
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const auto matches_instruction = [instruction](const auto& matcher) { return matcher.Matches(instruction); };
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const auto& subtable = table[detail::ToFastLookupIndexArm(instruction)];
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auto iter = std::find_if(subtable.begin(), subtable.end(), matches_instruction);
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return iter != subtable.end() ? std::optional<std::reference_wrapper<const ArmMatcher<V>>>(*iter) : std::nullopt;
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}
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} // namespace Dynarmic::A32
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