78 lines
2.3 KiB
C++
Executable File
78 lines
2.3 KiB
C++
Executable File
/* This file is part of the dynarmic project.
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* Copyright (c) 2020 MerryMage
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* SPDX-License-Identifier: 0BSD
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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 <set>
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#include <vector>
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#include "common/bit_util.h"
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#include "common/common_types.h"
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#include "frontend/decoder/decoder_detail.h"
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#include "frontend/decoder/matcher.h"
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namespace Dynarmic::A32 {
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template <typename Visitor>
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using ASIMDMatcher = Decoder::Matcher<Visitor, u32>;
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template <typename V>
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std::vector<ASIMDMatcher<V>> GetASIMDDecodeTable() {
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std::vector<ASIMDMatcher<V>> table = {
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#define INST(fn, name, bitstring) Decoder::detail::detail<ASIMDMatcher<V>>::GetMatcher(&V::fn, name, bitstring),
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#include "asimd.inc"
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#undef INST
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};
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// Exceptions to the rule of thumb.
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const std::set<std::string> comes_first{
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"VBIC, VMOV, VMVN, VORR (immediate)",
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"VEXT",
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"VTBL",
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"VTBX",
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"VDUP (scalar)",
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};
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const std::set<std::string> comes_last{
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"VMLA (scalar)",
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"VMLAL (scalar)",
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"VQDMLAL/VQDMLSL (scalar)",
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"VMUL (scalar)",
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"VMULL (scalar)",
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"VQDMULL (scalar)",
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"VQDMULH (scalar)",
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"VQRDMULH (scalar)",
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};
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const auto sort_begin = std::stable_partition(table.begin(), table.end(), [&](const auto& matcher) {
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return comes_first.count(matcher.GetName()) > 0;
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});
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const auto sort_end = std::stable_partition(table.begin(), table.end(), [&](const auto& matcher) {
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return comes_last.count(matcher.GetName()) == 0;
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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(sort_begin, sort_end, [](const auto& matcher1, const auto& matcher2) {
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return Common::BitCount(matcher1.GetMask()) > Common::BitCount(matcher2.GetMask());
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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 ASIMDMatcher<V>>> DecodeASIMD(u32 instruction) {
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static const auto table = GetASIMDDecodeTable<V>();
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const auto matches_instruction = [instruction](const auto& matcher) { return matcher.Matches(instruction); };
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auto iter = std::find_if(table.begin(), table.end(), matches_instruction);
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return iter != table.end() ? std::optional<std::reference_wrapper<const ASIMDMatcher<V>>>(*iter) : std::nullopt;
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}
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} // namespace Dynarmic::A32
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