62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
/* This file is part of the dynarmic project.
|
|
* Copyright (c) 2016 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 <dynarmic/A32/callbacks.h>
|
|
|
|
#include "frontend/ir/basic_block.h"
|
|
#include "frontend/ir/opcodes.h"
|
|
#include "ir_opt/passes.h"
|
|
|
|
namespace Dynarmic {
|
|
namespace Optimization {
|
|
|
|
void ConstantPropagation(IR::Block& block) {
|
|
for (auto& inst : block) {
|
|
switch (inst.GetOpcode()) {
|
|
case IR::Opcode::LogicalShiftLeft32:
|
|
case IR::Opcode::LogicalShiftRight32:
|
|
case IR::Opcode::ArithmeticShiftRight32:
|
|
case IR::Opcode::RotateRight32: {
|
|
if (!inst.GetAssociatedPseudoOperation(IR::Opcode::GetCarryFromOp)) {
|
|
inst.SetArg(2, IR::Value(false));
|
|
}
|
|
|
|
auto shift_amount = inst.GetArg(1);
|
|
if (shift_amount.IsImmediate() && shift_amount.GetU8() == 0) {
|
|
IR::Inst* carry_inst = inst.GetAssociatedPseudoOperation(IR::Opcode::GetCarryFromOp);
|
|
if (carry_inst) {
|
|
carry_inst->ReplaceUsesWith(inst.GetArg(2));
|
|
}
|
|
inst.ReplaceUsesWith(inst.GetArg(0));
|
|
}
|
|
break;
|
|
}
|
|
case IR::Opcode::ZeroExtendByteToWord: {
|
|
if (!inst.AreAllArgsImmediates())
|
|
break;
|
|
|
|
u8 byte = inst.GetArg(0).GetU8();
|
|
u32 value = static_cast<u32>(byte);
|
|
inst.ReplaceUsesWith(IR::Value{value});
|
|
break;
|
|
}
|
|
case IR::Opcode::ZeroExtendHalfToWord: {
|
|
if (!inst.AreAllArgsImmediates())
|
|
break;
|
|
|
|
u16 half = inst.GetArg(0).GetU16();
|
|
u32 value = static_cast<u32>(half);
|
|
inst.ReplaceUsesWith(IR::Value{value});
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace Optimization
|
|
} // namespace Dynarmic
|