74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
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/* This file is part of the dynarmic project.
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* Copyright (c) 2016 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#include <dynarmic/callbacks.h>
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#include "frontend/ir/basic_block.h"
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#include "frontend/ir/opcodes.h"
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#include "ir_opt/passes.h"
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namespace Dynarmic {
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namespace Optimization {
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void ConstantPropagation(IR::Block& block, const UserCallbacks::Memory& memory_callbacks) {
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for (auto& inst : block) {
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if (!inst.AreAllArgsImmediates())
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continue;
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switch (inst.GetOpcode()) {
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case IR::Opcode::ReadMemory8: {
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u32 vaddr = inst.GetArg(0).GetU32();
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if (memory_callbacks.IsReadOnlyMemory(vaddr)) {
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u8 value_from_memory = memory_callbacks.Read8(vaddr);
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inst.ReplaceUsesWith(IR::Value{value_from_memory});
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}
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break;
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}
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case IR::Opcode::ReadMemory16: {
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u32 vaddr = inst.GetArg(0).GetU32();
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if (memory_callbacks.IsReadOnlyMemory(vaddr)) {
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u16 value_from_memory = memory_callbacks.Read16(vaddr);
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inst.ReplaceUsesWith(IR::Value{value_from_memory});
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}
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break;
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}
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case IR::Opcode::ReadMemory32: {
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u32 vaddr = inst.GetArg(0).GetU32();
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if (memory_callbacks.IsReadOnlyMemory(vaddr)) {
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u32 value_from_memory = memory_callbacks.Read32(vaddr);
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inst.ReplaceUsesWith(IR::Value{value_from_memory});
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}
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break;
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}
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case IR::Opcode::ReadMemory64: {
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u32 vaddr = inst.GetArg(0).GetU32();
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if (memory_callbacks.IsReadOnlyMemory(vaddr)) {
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u64 value_from_memory = memory_callbacks.Read64(vaddr);
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inst.ReplaceUsesWith(IR::Value{value_from_memory});
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}
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break;
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}
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case IR::Opcode::ZeroExtendByteToWord: {
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u8 byte = inst.GetArg(0).GetU8();
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u32 value = static_cast<u32>(byte);
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inst.ReplaceUsesWith(IR::Value{value});
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break;
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}
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case IR::Opcode::ZeroExtendHalfToWord: {
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u16 half = inst.GetArg(0).GetU16();
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u32 value = static_cast<u32>(half);
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inst.ReplaceUsesWith(IR::Value{value});
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break;
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}
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default:
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break;
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}
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}
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}
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} // namespace Optimization
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} // namespace Dynarmic
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