dynarmic/src/ir_opt/a64_merge_interpret_blocks.cpp

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/* This file is part of the dynarmic project.
* Copyright (c) 2018 MerryMage
* This software may be used and distributed according to the terms of the GNU
* General Public License version 2 or any later version.
*/
#include <array>
#include <boost/variant/get.hpp>
#include "common/assert.h"
#include "common/common_types.h"
#include "dynarmic/A64/config.h"
#include "frontend/A64/location_descriptor.h"
#include "frontend/A64/translate/translate.h"
#include "frontend/ir/basic_block.h"
#include "ir_opt/passes.h"
namespace Dynarmic {
namespace Optimization {
void A64MergeInterpretBlocksPass(IR::Block& block, A64::UserCallbacks* cb) {
const auto is_interpret_instruction = [cb](A64::LocationDescriptor location) {
const u32 instruction = cb->MemoryReadCode(location.PC());
IR::Block new_block{location};
A64::TranslateSingleInstruction(new_block, location, instruction);
if (!new_block.Instructions().empty())
return false;
const IR::Terminal terminal = new_block.GetTerminal();
if (auto term = boost::get<IR::Term::Interpret>(&terminal)) {
return term->next == location;
}
return false;
};
IR::Terminal terminal = block.GetTerminal();
auto term = boost::get<IR::Term::Interpret>(&terminal);
if (!term)
return;
A64::LocationDescriptor location{term->next};
size_t num_instructions = 1;
while (is_interpret_instruction(location.AdvancePC(static_cast<int>(num_instructions * 4)))) {
num_instructions++;
}
term->num_instructions = num_instructions;
block.ReplaceTerminal(terminal);
block.CycleCount() += num_instructions - 1;
}
} // namespace Optimization
} // namespace Dynarmic