Merge branch 'backend-O1-1' into backend

src/backend/RISCv64/RISCv64ISel.cpp

@@ -103,6 +103,81 @@ void RISCv64ISel::select() {
         }
     }
 
+    // 仅当函数满足特定条件时，才需要保存参数寄存器,应用更精细的过滤规则
+    // 1. 函数包含call指令 (非叶子函数): 参数寄存器(a0-a7)是调用者保存的，
+    //    call指令可能会覆盖这些寄存器，因此必须保存。
+    // 2. 函数包含alloca指令 (需要栈分配)。
+    // 3. 函数的指令数量超过一个阈值（如20），意味着它是一个复杂的叶子函数，
+    //    为安全起见，保存其参数。
+    // 简单的叶子函数 (如min) 则可以跳过这个步骤进行优化。
+    auto shouldSaveArgs = [](Function* func) {
+        if (!func) return false;
+        int instruction_count = 0;
+        for (const auto& bb : func->getBasicBlocks()) {
+            for (const auto& inst : bb->getInstructions()) {
+                if (dynamic_cast<CallInst*>(inst.get()) || dynamic_cast<AllocaInst*>(inst.get())) {
+                    return true; // 发现call或alloca，立即返回true
+                }
+                instruction_count++;
+            }
+        }
+        // 如果没有call或alloca，则检查指令数量
+        return instruction_count > 45;
+    };
+
+    if (optLevel > 0 && shouldSaveArgs(F)) {
+        if (F && !F->getBasicBlocks().empty()) {
+            // 定位到第一个MachineBasicBlock，也就是函数入口
+            BasicBlock* first_ir_block = F->getBasicBlocks_NoRange().front().get();
+            CurMBB = bb_map.at(first_ir_block);
+
+            int int_arg_idx = 0;
+            int fp_arg_idx = 0;
+
+            for (Argument* arg : F->getArguments()) {
+                Type* arg_type = arg->getType();
+
+                // --- 处理整数/指针参数 ---
+                if (!arg_type->isFloat() && int_arg_idx < 8) {
+                    // 1. 获取参数原始的、将被预着色为 a0-a7 的 vreg
+                    unsigned original_vreg = getVReg(arg);
+
+                    // 2. 创建一个新的、安全的 vreg 来持有参数的值
+                    unsigned saved_vreg = getNewVReg(arg_type);
+
+                    // 3. 生成 mv saved_vreg, original_vreg 指令
+                    auto mv = std::make_unique<MachineInstr>(RVOpcodes::MV);
+                    mv->addOperand(std::make_unique<RegOperand>(saved_vreg));
+                    mv->addOperand(std::make_unique<RegOperand>(original_vreg));
+                    CurMBB->addInstruction(std::move(mv));
+
+                    MFunc->addProtectedArgumentVReg(saved_vreg);
+                    // 4.【关键】更新vreg映射表，将arg的vreg指向新的、安全的vreg
+                    //    这样，后续所有对该参数的 getVReg(arg) 调用都会自动获得 saved_vreg，
+                    //    使得函数体内的代码都使用这个被保存过的值。
+                    vreg_map[arg] = saved_vreg;
+                    int_arg_idx++;
+                }
+                // --- 处理浮点参数 ---
+                else if (arg_type->isFloat() && fp_arg_idx < 8) {
+                    unsigned original_vreg = getVReg(arg);
+                    unsigned saved_vreg = getNewVReg(arg_type);
+
+                    // 对于浮点数，使用 fmv.s 指令
+                    auto fmv = std::make_unique<MachineInstr>(RVOpcodes::FMV_S);
+                    fmv->addOperand(std::make_unique<RegOperand>(saved_vreg));
+                    fmv->addOperand(std::make_unique<RegOperand>(original_vreg));
+                    CurMBB->addInstruction(std::move(fmv));
+
+                    MFunc->addProtectedArgumentVReg(saved_vreg);
+                    vreg_map[arg] = saved_vreg;
+                    fp_arg_idx++;
+                }
+                // 对于栈传递的参数，则无需处理
+            }
+        }
+    }
+
     // 遍历基本块，进行指令选择
     for (const auto& bb_ptr : F->getBasicBlocks()) {
         selectBasicBlock(bb_ptr.get());
@@ -501,6 +576,14 @@ void RISCv64ISel::selectNode(DAGNode* node) {
                     CurMBB->addInstruction(std::move(instr));
                     break;
                 }
+                case BinaryInst::kMulh: {
+                    auto instr = std::make_unique<MachineInstr>(RVOpcodes::MULH);
+                    instr->addOperand(std::make_unique<RegOperand>(dest_vreg));
+                    instr->addOperand(std::make_unique<RegOperand>(lhs_vreg));
+                    instr->addOperand(std::make_unique<RegOperand>(rhs_vreg));
+                    CurMBB->addInstruction(std::move(instr));
+                    break;
+                }
                 case Instruction::kDiv: {
                     auto instr = std::make_unique<MachineInstr>(RVOpcodes::DIVW);
                     instr->addOperand(std::make_unique<RegOperand>(dest_vreg));
@@ -612,6 +695,22 @@ void RISCv64ISel::selectNode(DAGNode* node) {
                     CurMBB->addInstruction(std::move(xori));
                     break;
                 }
+                case BinaryInst::kAnd: {
+                    auto instr = std::make_unique<MachineInstr>(RVOpcodes::AND);
+                    instr->addOperand(std::make_unique<RegOperand>(dest_vreg));
+                    instr->addOperand(std::make_unique<RegOperand>(lhs_vreg));
+                    instr->addOperand(std::make_unique<RegOperand>(rhs_vreg));
+                    CurMBB->addInstruction(std::move(instr));
+                    break;
+                }
+                case BinaryInst::kOr: {
+                    auto instr = std::make_unique<MachineInstr>(RVOpcodes::OR);
+                    instr->addOperand(std::make_unique<RegOperand>(dest_vreg));
+                    instr->addOperand(std::make_unique<RegOperand>(lhs_vreg));
+                    instr->addOperand(std::make_unique<RegOperand>(rhs_vreg));
+                    CurMBB->addInstruction(std::move(instr));
+                    break;
+                }
                 default:
                     throw std::runtime_error("Unsupported binary instruction in ISel");
             }
@@ -1257,6 +1356,7 @@ void RISCv64ISel::selectNode(DAGNode* node) {
             auto gep = dynamic_cast<GetElementPtrInst*>(node->value);
             auto result_vreg = getVReg(gep);
 
+            if (optLevel == 0) {
             // --- Step 1: 获取基地址 (此部分逻辑正确，保持不变) ---
             auto base_ptr_node = node->operands[0];
             auto current_addr_vreg = getNewVReg(gep->getType());
@@ -1363,6 +1463,106 @@ void RISCv64ISel::selectNode(DAGNode* node) {
             final_mv->addOperand(std::make_unique<RegOperand>(current_addr_vreg));
             CurMBB->addInstruction(std::move(final_mv));
             break;
+        } else {
+            // 对于-O1时的处理逻辑
+            // --- Step 1: 获取基地址 ---
+            auto base_ptr_node = node->operands[0];
+            auto base_ptr_val = base_ptr_node->value;
+            
+            // last_step_addr_vreg 保存上一步计算的结果。
+            // 它首先被初始化为GEP的初始基地址。
+            unsigned last_step_addr_vreg; 
+
+            if (auto alloca_base = dynamic_cast<AllocaInst*>(base_ptr_val)) {
+                last_step_addr_vreg = getNewVReg(gep->getType());
+                auto frame_addr_instr = std::make_unique<MachineInstr>(RVOpcodes::FRAME_ADDR);
+                frame_addr_instr->addOperand(std::make_unique<RegOperand>(last_step_addr_vreg));
+                frame_addr_instr->addOperand(std::make_unique<RegOperand>(getVReg(alloca_base)));
+                CurMBB->addInstruction(std::move(frame_addr_instr));
+            } else if (auto global_base = dynamic_cast<GlobalValue*>(base_ptr_val)) {
+                last_step_addr_vreg = getNewVReg(gep->getType());
+                auto la_instr = std::make_unique<MachineInstr>(RVOpcodes::LA);
+                la_instr->addOperand(std::make_unique<RegOperand>(last_step_addr_vreg));
+                la_instr->addOperand(std::make_unique<LabelOperand>(global_base->getName()));
+                CurMBB->addInstruction(std::move(la_instr));
+            } else {
+                // 对于函数参数或来自其他指令的指针，直接获取其vreg。
+                // 这个vreg必须被保护，不能在计算中被修改。
+                last_step_addr_vreg = getVReg(base_ptr_val);
+            }
+
+            // --- Step 2: 遵循LLVM GEP语义迭代计算地址 ---
+            Type* current_type = gep->getBasePointer()->getType()->as<PointerType>()->getBaseType();
+
+            for (size_t i = 0; i < gep->getNumIndices(); ++i) {
+                Value* indexValue = gep->getIndex(i);
+                unsigned stride = getTypeSizeInBytes(current_type);
+                
+                if (stride != 0) {
+                    // --- 为当前索引和步长生成偏移计算指令 ---
+                    auto offset_vreg = getNewVReg(Type::getIntType());
+                    
+                    unsigned index_vreg;
+                    if (auto const_index = dynamic_cast<ConstantValue*>(indexValue)) {
+                        index_vreg = getNewVReg(Type::getIntType());
+                        auto li = std::make_unique<MachineInstr>(RVOpcodes::LI);
+                        li->addOperand(std::make_unique<RegOperand>(index_vreg));
+                        li->addOperand(std::make_unique<ImmOperand>(const_index->getInt()));
+                        CurMBB->addInstruction(std::move(li));
+                    } else {
+                        index_vreg = getVReg(indexValue);
+                    }
+                    
+                    if (stride == 1) {
+                        auto mv = std::make_unique<MachineInstr>(RVOpcodes::MV);
+                        mv->addOperand(std::make_unique<RegOperand>(offset_vreg));
+                        mv->addOperand(std::make_unique<RegOperand>(index_vreg));
+                        CurMBB->addInstruction(std::move(mv));
+                    } else {
+                        auto size_vreg = getNewVReg(Type::getIntType());
+                        auto li_size = std::make_unique<MachineInstr>(RVOpcodes::LI);
+                        li_size->addOperand(std::make_unique<RegOperand>(size_vreg));
+                        li_size->addOperand(std::make_unique<ImmOperand>(stride));
+                        CurMBB->addInstruction(std::move(li_size));
+                        
+                        auto mul = std::make_unique<MachineInstr>(RVOpcodes::MULW);
+                        mul->addOperand(std::make_unique<RegOperand>(offset_vreg));
+                        mul->addOperand(std::make_unique<RegOperand>(index_vreg));
+                        mul->addOperand(std::make_unique<RegOperand>(size_vreg));
+                        CurMBB->addInstruction(std::move(mul));
+                    }
+
+                    // --- 关键修复点 ---
+                    // 创建一个新的vreg来保存本次加法的结果。
+                    unsigned current_step_addr_vreg = getNewVReg(gep->getType());
+                    
+                    // 执行 add current_step, last_step, offset
+                    // 这确保了 last_step_addr_vreg (输入) 永远不会被直接修改。
+                    auto add = std::make_unique<MachineInstr>(RVOpcodes::ADD);
+                    add->addOperand(std::make_unique<RegOperand>(current_step_addr_vreg));
+                    add->addOperand(std::make_unique<RegOperand>(last_step_addr_vreg));
+                    add->addOperand(std::make_unique<RegOperand>(offset_vreg));
+                    CurMBB->addInstruction(std::move(add));
+
+                    // 本次的结果成为下一次计算的输入。
+                    last_step_addr_vreg = current_step_addr_vreg;
+                }
+
+                // --- 为下一次迭代更新类型 ---
+                if (auto array_type = current_type->as<ArrayType>()) {
+                    current_type = array_type->getElementType();
+                } else if (auto ptr_type = current_type->as<PointerType>()) {
+                    current_type = ptr_type->getBaseType();
+                }
+            }
+            
+            // --- Step 3: 将最终计算出的地址存入GEP的目标虚拟寄存器 ---
+            auto final_mv = std::make_unique<MachineInstr>(RVOpcodes::MV);
+            final_mv->addOperand(std::make_unique<RegOperand>(result_vreg));
+            final_mv->addOperand(std::make_unique<RegOperand>(last_step_addr_vreg));
+            CurMBB->addInstruction(std::move(final_mv));
+            break;
+        }
         }
 
         default:

src/backend/RISCv64/RISCv64RegAlloc.cpp

@@ -98,6 +98,7 @@ bool RISCv64RegAlloc::doAllocation() {
     precolorByCallingConvention();
     analyzeLiveness();
     build();
+    protectCrossCallVRegs();
     makeWorklist();
 
     while (!simplifyWorklist.empty() || !worklistMoves.empty() || !freezeWorklist.empty() || !spillWorklist.empty()) {
@@ -127,20 +128,46 @@ void RISCv64RegAlloc::precolorByCallingConvention() {
     int int_arg_idx = 0;
     int float_arg_idx = 0;
 
-    for (Argument* arg : F->getArguments()) {
-        unsigned vreg = ISel->getVReg(arg);
-        
-        if (arg->getType()->isFloat()) {
-            if (float_arg_idx < 8) { // fa0-fa7
-                auto preg = static_cast<PhysicalReg>(static_cast<int>(PhysicalReg::F10) + float_arg_idx);
-                color_map[vreg] = preg;
-                float_arg_idx++;
+    if (optLevel > 0)
+    {
+        for (const auto& pair : vreg_to_value_map) {
+            unsigned vreg = pair.first;
+            Value* val = pair.second;
+
+            // 检查这个 Value* 是不是一个 Argument 对象
+            if (auto arg = dynamic_cast<Argument*>(val)) {
+                // 如果是，那么 vreg 就是最初分配给这个参数的 vreg
+                int arg_idx = arg->getIndex();
+
+                if (arg->getType()->isFloat()) {
+                    if (arg_idx < 8) { // fa0-fa7
+                        auto preg = static_cast<PhysicalReg>(static_cast<int>(PhysicalReg::F10) + arg_idx);
+                        color_map[vreg] = preg;
+                    }
+                } else { // 整数或指针
+                    if (arg_idx < 8) { // a0-a7
+                        auto preg = static_cast<PhysicalReg>(static_cast<int>(PhysicalReg::A0) + arg_idx);
+                        color_map[vreg] = preg;
+                    }
+                }
             }
-        } else { // 整数或指针
-            if (int_arg_idx < 8) { // a0-a7
-                auto preg = static_cast<PhysicalReg>(static_cast<int>(PhysicalReg::A0) + int_arg_idx);
-                color_map[vreg] = preg;
-                int_arg_idx++;
+        }
+    } else {
+        for (Argument* arg : F->getArguments()) {
+            unsigned vreg = ISel->getVReg(arg);
+            
+            if (arg->getType()->isFloat()) {
+                if (float_arg_idx < 8) { // fa0-fa7
+                    auto preg = static_cast<PhysicalReg>(static_cast<int>(PhysicalReg::F10) + float_arg_idx);
+                    color_map[vreg] = preg;
+                    float_arg_idx++;
+                }
+            } else { // 整数或指针
+                if (int_arg_idx < 8) { // a0-a7
+                    auto preg = static_cast<PhysicalReg>(static_cast<int>(PhysicalReg::A0) + int_arg_idx);
+                    color_map[vreg] = preg;
+                    int_arg_idx++;
+                }
             }
         }
     }
@@ -159,6 +186,57 @@ void RISCv64RegAlloc::precolorByCallingConvention() {
     }
 }
 
+void RISCv64RegAlloc::protectCrossCallVRegs() {
+    // 从ISel获取被标记为需要保护的参数副本vreg集合
+    const auto& vregs_to_protect_potentially = MFunc->getProtectedArgumentVRegs();
+    if (vregs_to_protect_potentially.empty()) {
+        return; // 如果没有需要保护的vreg，直接返回
+    }
+
+    // VRegSet live_across_call_vregs;
+    // // 遍历所有指令，找出哪些被标记的vreg其生命周期确实跨越了call指令
+    // for (const auto& mbb_ptr : MFunc->getBlocks()) {
+    //     for (const auto& instr_ptr : mbb_ptr->getInstructions()) {
+    //         if (instr_ptr->getOpcode() == RVOpcodes::CALL) {
+    //             const VRegSet& live_out_after_call = live_out_map.at(instr_ptr.get());
+    //             for (unsigned vreg : vregs_to_protect_potentially) {
+    //                 if (live_out_after_call.count(vreg)) {
+    //                     live_across_call_vregs.insert(vreg);
+    //                 }
+    //             }
+    //         }
+    //     }
+    // }
+
+    // if (live_across_call_vregs.empty()) {
+    //     return; // 如果被标记的vreg没有一个跨越call，也无需操作
+    // }
+
+    // if (DEEPDEBUG) {
+    //     std::cerr << "--- [FIX] Applying protection for argument vregs that live across calls: ";
+    //     for(unsigned v : live_across_call_vregs) std::cerr << regIdToString(v) << " ";
+    //     std::cerr << "\n";
+    // }
+
+    // 获取所有调用者保存寄存器
+    const auto& caller_saved_int = getCallerSavedIntRegs();
+    const auto& caller_saved_fp = getCallerSavedFpRegs();
+    const unsigned offset = static_cast<unsigned>(PhysicalReg::PHYS_REG_START_ID);
+
+    // 为每个确认跨越call的vreg，添加与所有调用者保存寄存器的冲突
+    for (unsigned vreg : vregs_to_protect_potentially) {
+        if (isFPVReg(vreg)) { // 如果是浮点vreg
+            for (auto preg : caller_saved_fp) {
+                addEdge(vreg, offset + static_cast<unsigned>(preg));
+            }
+        } else { // 如果是整数vreg
+            for (auto preg : caller_saved_int) {
+                addEdge(vreg, offset + static_cast<unsigned>(preg));
+            }
+        }
+    }
+}
+
 // 初始化/重置所有数据结构
 void RISCv64RegAlloc::initialize() {
     initial.clear();
@@ -477,16 +555,26 @@ void RISCv64RegAlloc::coalesce() {
     unsigned x = getAlias(*def.begin());
     unsigned y = getAlias(*use.begin());
     unsigned u, v;
-    if (precolored.count(y)) { u = y; v = x; } else { u = x; v = y; }
+
+    // 总是将待合并的虚拟寄存器赋给 v，将合并目标赋给 u。
+    // 优先级: 物理寄存器 (precolored) > 已着色的虚拟寄存器 (coloredNodes) > 普通虚拟寄存器。
+    if (precolored.count(y)) {
+        u = y;
+        v = x;
+    } else if (precolored.count(x)) {
+        u = x;
+        v = y;
+    } else if (coloredNodes.count(y)) {
+        u = y;
+        v = x;
+    } else {
+        u = x;
+        v = y;
+    }
     
     // 防御性检查，处理物理寄存器之间的传送指令
     if (precolored.count(u) && precolored.count(v)) {
-        // 如果 u 和 v 都是物理寄存器，我们不能合并它们。
-        // 这通常是一条寄存器拷贝指令，例如 `mv a2, a1`。
-        // 把它加入 constrainedMoves 列表，然后直接返回，不再处理。
         constrainedMoves.insert(move);
-        // addWorklist(u) 和 addWorklist(v) 在这里也不需要调用，
-        // 因为它们只对虚拟寄存器有意义。
         return;
     }
 
@@ -498,9 +586,77 @@ void RISCv64RegAlloc::coalesce() {
         if (DEEPERDEBUG) std::cerr << "  -> Trivial coalesce (u == v).\n";
         coalescedMoves.insert(move);
         addWorklist(u);
-        return; // 处理完毕，提前返回
+        return;
+    }
+    
+    bool is_conflicting = false;
+    // 检查1：u 和 v 在冲突图中是否直接相连
+    if ((adjList.count(v) && adjList.at(v).count(u)) || (adjList.count(u) && adjList.at(u).count(v))) {
+        if (DEEPERDEBUG) std::cerr << "  -> [Check] Nodes interfere directly.\n";
+        is_conflicting = true;
+    } 
+    // 检查2：如果节点不直接相连，则检查是否存在间接的颜色冲突
+    else {
+        // 获取 u 和 v 的颜色（如果它们有的话）
+        unsigned u_color_id = 0, v_color_id = 0;
+        if (precolored.count(u)) {
+            u_color_id = u;
+        } else if (coloredNodes.count(u) || color_map.count(u)) { // color_map.count(u) 是更可靠的检查
+            u_color_id = static_cast<unsigned>(PhysicalReg::PHYS_REG_START_ID) + static_cast<unsigned>(color_map.at(u));
+        }
+
+        if (precolored.count(v)) {
+            v_color_id = v;
+        } else if (coloredNodes.count(v) || color_map.count(v)) {
+            v_color_id = static_cast<unsigned>(PhysicalReg::PHYS_REG_START_ID) + static_cast<unsigned>(color_map.at(v));
+        }
+
+        // 如果 u 有颜色，检查 v 是否与该颜色代表的物理寄存器冲突
+        if (u_color_id != 0 && adjList.count(v) && adjList.at(v).count(u_color_id)) {
+            if (DEEPERDEBUG) std::cerr << "  -> [Check] Node " << regIdToString(v) << " interferes with the color of " << regIdToString(u) << " (" << regIdToString(u_color_id) << ").\n";
+            is_conflicting = true;
+        }
+        // 如果 v 有颜色，检查 u 是否与该颜色代表的物理寄存器冲突
+        else if (v_color_id != 0 && adjList.count(u) && adjList.at(u).count(v_color_id)) {
+            if (DEEPERDEBUG) std::cerr << "  -> [Check] Node " << regIdToString(u) << " interferes with the color of " << regIdToString(v) << " (" << regIdToString(v_color_id) << ").\n";
+            is_conflicting = true;
+        }
     }
 
+    if (is_conflicting) {
+        if (DEEPERDEBUG) std::cerr << "  -> Constrained (nodes interfere directly or via pre-coloring).\n";
+        constrainedMoves.insert(move);
+        addWorklist(u);
+        addWorklist(v);
+        return;
+    }
+
+    bool u_is_colored = precolored.count(u) || coloredNodes.count(u);
+    bool v_is_colored = precolored.count(v) || coloredNodes.count(v);
+
+    if (u_is_colored && v_is_colored) {
+        PhysicalReg u_color = precolored.count(u) 
+            ? static_cast<PhysicalReg>(u - static_cast<unsigned>(PhysicalReg::PHYS_REG_START_ID)) 
+            : color_map.at(u);
+        PhysicalReg v_color = precolored.count(v) 
+            ? static_cast<PhysicalReg>(v - static_cast<unsigned>(PhysicalReg::PHYS_REG_START_ID)) 
+            : color_map.at(v);
+        
+        if (u_color != v_color) {
+            if (DEEPERDEBUG) std::cerr << "  -> Constrained (move between two different precolored nodes: " 
+                                   << regToString(u_color) << " and " << regToString(v_color) << ").\n";
+            constrainedMoves.insert(move);
+            return;
+        } else {
+            if (DEEPERDEBUG) std::cerr << "  -> Trivial coalesce (move between same precolored nodes).\n";
+            coalescedMoves.insert(move);
+            combine(u, v);
+            addWorklist(u);
+            return;
+        }
+    }
+
+    // 类型检查 
     if (isFPVReg(u) != isFPVReg(v)) {
         if (DEEPERDEBUG) std::cerr << "  -> Constrained (type mismatch: " << regIdToString(u) << " is " 
                                 << (isFPVReg(u) ? "float" : "int") << ", " << regIdToString(v) << " is "
@@ -508,76 +664,52 @@ void RISCv64RegAlloc::coalesce() {
         constrainedMoves.insert(move);
         addWorklist(u);
         addWorklist(v);
-        return; // 立即返回，不再进行后续检查
-    }
-    
-    bool pre_interfere = adjList.at(v).count(u);
-    
-    if (pre_interfere) {
-        if (DEEPERDEBUG) std::cerr << "  -> Constrained (nodes already interfere).\n";
-        constrainedMoves.insert(move);
-        addWorklist(u);
-        addWorklist(v);
         return;
     }
-
-    bool is_u_precolored = precolored.count(u);
+    
+    // 启发式判断逻辑 
+    bool u_is_effectively_precolored = precolored.count(u) || coloredNodes.count(u);
     bool can_coalesce = false;
     
-    if (is_u_precolored) {
-        // --- 场景1：u是物理寄存器，使用 George 启发式 ---
-        if (DEEPERDEBUG) std::cerr << "  -> Trying George Heuristic (u is precolored)...\n";
+    if (u_is_effectively_precolored) {
+        if (DEEPERDEBUG) std::cerr << "  -> Trying George Heuristic (u is effectively precolored)...\n";
         
-        // 步骤 1: 独立调用 adjacent(v) 获取邻居集合
         VRegSet neighbors_of_v = adjacent(v);
         if (DEEPERDEBUG) {
             std::cerr << "      - Neighbors of " << regIdToString(v) << " to check are (" << neighbors_of_v.size() << "): { ";
             for (unsigned id : neighbors_of_v) std::cerr << regIdToString(id) << " ";
             std::cerr << "}\n";
         }
-
-        // 步骤 2: 使用显式的 for 循环来代替 std::all_of
-        bool george_ok = true; // 默认假设成功，任何一个邻居失败都会将此设为 false
+        
+        bool george_ok = true;
         for (unsigned t : neighbors_of_v) {
-            if (DEEPERDEBUG) {
-                std::cerr << "      - Checking neighbor " << regIdToString(t) << ":\n";
-            }
+            if (DEEPERDEBUG) std::cerr << "      - Checking neighbor " << regIdToString(t) << ":\n";
 
-            // 步骤 3: 独立调用启发式函数
-            bool heuristic_result = georgeHeuristic(t, u);
+            unsigned u_phys_id = precolored.count(u) ? u : (static_cast<unsigned>(PhysicalReg::PHYS_REG_START_ID) + static_cast<unsigned>(color_map.at(u)));
+            bool heuristic_result = georgeHeuristic(t, u_phys_id);
             
             if (DEEPERDEBUG) {
-                std::cerr << "          - georgeHeuristic(" << regIdToString(t) << ", " << regIdToString(u) << ") -> " << (heuristic_result ? "OK" : "FAIL") << "\n";
+                std::cerr << "          - georgeHeuristic(" << regIdToString(t) << ", " << regIdToString(u_phys_id) << ") -> " << (heuristic_result ? "OK" : "FAIL") << "\n";
             }
 
             if (!heuristic_result) {
-                george_ok = false; // 只要有一个邻居不满足条件，整个检查就失败
-                break;             // 并且可以立即停止检查其他邻居
+                george_ok = false;
+                break;
             }
         }
         
-        if (DEEPERDEBUG) {
-             std::cerr << "  -> George Heuristic final result: " << (george_ok ? "OK" : "FAIL") << "\n";
-        }
-
-        if (george_ok) {
-            can_coalesce = true;
-        }
+        if (DEEPERDEBUG) std::cerr << "  -> George Heuristic final result: " << (george_ok ? "OK" : "FAIL") << "\n";
+        if (george_ok) can_coalesce = true;
 
     } else {
-        // --- 场景2：u和v都是虚拟寄存器，使用 Briggs 启发式 ---
+        // --- 场景2：u和v都是未着色的虚拟寄存器，使用 Briggs 启发式 ---
         if (DEEPERDEBUG) std::cerr << "  -> Trying Briggs Heuristic (u and v are virtual)...\n";
         
         bool briggs_ok = briggsHeuristic(u, v);
         if (DEEPERDEBUG) std::cerr << "      - briggsHeuristic(" << regIdToString(u) << ", " << regIdToString(v) << ") -> " << (briggs_ok ? "OK" : "FAIL") << "\n";
-
-        if (briggs_ok) {
-            can_coalesce = true;
-        }
+        if (briggs_ok) can_coalesce = true;
     }
 
-    // --- 根据启发式结果进行最终决策 ---
-    
     if (can_coalesce) {
         if (DEEPERDEBUG) std::cerr << "  -> Heuristic OK. Combining " << regIdToString(v) << " into " << regIdToString(u) << ".\n";
         coalescedMoves.insert(move);
@@ -1133,7 +1265,7 @@ unsigned RISCv64RegAlloc::getAlias(unsigned n) {
 }
 
 void RISCv64RegAlloc::addWorklist(unsigned u) {
-    if (precolored.count(u)) return;
+    if (precolored.count(u) || color_map.count(u)) return;
 
     int K = isFPVReg(u) ? K_fp : K_int;
     if (!moveRelated(u) && degree.at(u) < K) {
@@ -1208,8 +1340,8 @@ bool RISCv64RegAlloc::georgeHeuristic(unsigned t, unsigned u) {
     }
     
     int K = isFPVReg(t) ? K_fp : K_int;
-    // adjList.at(t) 现在是安全的，因为 degree.count(t) > 0 保证了 adjList.count(t) > 0
-    return degree.at(t) < K || precolored.count(u) || adjList.at(t).count(u);
+    
+    return degree.at(t) < K || adjList.at(t).count(u);
 }
 
 void RISCv64RegAlloc::combine(unsigned u, unsigned v) {
@@ -1257,7 +1389,7 @@ void RISCv64RegAlloc::freezeMoves(unsigned u) {
         activeMoves.erase(move);
         frozenMoves.insert(move);
 
-        if (!precolored.count(v_alias) && nodeMoves(v_alias).empty() && degree.at(v_alias) < (isFPVReg(v_alias) ? K_fp : K_int)) {
+        if (!precolored.count(v_alias) && !coloredNodes.count(v_alias) && nodeMoves(v_alias).empty() && degree.at(v_alias) < (isFPVReg(v_alias) ? K_fp : K_int)) {
             freezeWorklist.erase(v_alias);
             simplifyWorklist.insert(v_alias);
             if (DEEPERDEBUG) {

src/include/backend/RISCv64/RISCv64ISel.h

@@ -11,6 +11,7 @@ namespace sysy {
 
 extern int DEBUG;
 extern int DEEPDEBUG;
+extern int optLevel;
 
 namespace sysy {
 

src/include/backend/RISCv64/RISCv64LLIR.h

@@ -326,12 +326,19 @@ public:
     void addBlock(std::unique_ptr<MachineBasicBlock> block) {
         blocks.push_back(std::move(block));
     }
+    void addProtectedArgumentVReg(unsigned vreg) {
+        protected_argument_vregs.insert(vreg);
+    }
+    const std::set<unsigned>& getProtectedArgumentVRegs() const {
+        return protected_argument_vregs;
+    }
 private:
     Function* F;
     RISCv64ISel* isel; // 指向创建它的ISel，用于获取vreg映射等信息
     std::string name;
     std::vector<std::unique_ptr<MachineBasicBlock>> blocks;
     StackFrameInfo frame_info;
+    std::set<unsigned> protected_argument_vregs;
 };
 inline bool isMemoryOp(RVOpcodes opcode) {
     switch (opcode) {

src/include/backend/RISCv64/RISCv64RegAlloc.h

@@ -12,6 +12,7 @@ extern int DEBUG;
 extern int DEEPDEBUG;
 extern int DEBUGLENGTH; // 用于限制调试输出的长度
 extern int DEEPERDEBUG; // 用于更深层次的调试输出
+extern int optLevel;
 
 namespace sysy {
 
@@ -44,12 +45,11 @@ private:
     void rewriteProgram();
     bool doAllocation();
     void applyColoring();
-
-    void dumpState(const std::string &stage);
-
     void precolorByCallingConvention();
+    void protectCrossCallVRegs();
 
     // --- 辅助函数 ---
+    void dumpState(const std::string &stage);
     void getInstrUseDef(const MachineInstr* instr, VRegSet& use, VRegSet& def);
     void getInstrUseDef_Liveness(const MachineInstr *instr, VRegSet &use, VRegSet &def);
     void addEdge(unsigned u, unsigned v);

src/include/midend/IR.h

@@ -1007,6 +1007,7 @@ class PhiInst : public Instruction {
   void replaceIncomingBlock(BasicBlock *oldBlock, BasicBlock *newBlock, Value *newValue);
   void refreshMap() {
     blk2val.clear();
+    vsize = getNumOperands() / 2;
     for (unsigned i = 0; i < vsize; ++i) {
       blk2val[getIncomingBlock(i)] = getIncomingValue(i);
     }

src/include/midend/Pass/Optimize/LargeArrayToGlobal.h

@@ -1,24 +0,0 @@
-#pragma once
-
-#include "../Pass.h"
-
-namespace sysy {
-
-class LargeArrayToGlobalPass : public OptimizationPass {
-public:
-    static void *ID;
-
-    LargeArrayToGlobalPass() : OptimizationPass("LargeArrayToGlobal", Granularity::Module) {}
-
-    bool runOnModule(Module *M, AnalysisManager &AM) override;
-    void *getPassID() const override {
-        return &ID;
-    }
-
-private:
-    unsigned calculateTypeSize(Type *type);
-    void convertAllocaToGlobal(AllocaInst *alloca, Function *F, Module *M);
-    std::string generateUniqueGlobalName(AllocaInst *alloca, Function *F);
-};
-
-} // namespace sysy

src/include/midend/Pass/Optimize/SysYIROptUtils.h

@@ -109,6 +109,34 @@ public:
   }
 
   
+  // PHI指令消除相关方法
+  static bool eliminateRedundantPhisInFunction(Function* func){
+    bool changed = false;
+    std::vector<Instruction *> toDelete;
+    for (auto &bb : func->getBasicBlocks()) {
+      for (auto &inst : bb->getInstructions()) {
+        if (auto phi = dynamic_cast<PhiInst *>(inst.get())) {
+          auto incoming = phi->getIncomingValues();
+          if(DEBUG){
+            std::cout << "Checking Phi: " << phi->getName() << " with " << incoming.size() << " incoming values." << std::endl;
+          }
+          if (incoming.size() == 1) {
+            Value *singleVal = incoming[0].second;
+            inst->replaceAllUsesWith(singleVal);
+            toDelete.push_back(inst.get());
+          }
+        }
+        else
+          break; // 只处理Phi指令
+      }
+    }
+    for (auto *phi : toDelete) {
+      usedelete(phi);
+      changed = true; // 标记为已更改
+    }
+    return changed; // 返回是否有删除发生
+  }
+
   //该实现参考了libdivide的算法
   static std::pair<int, int> computeMulhMagicNumbers(int divisor) {
     

src/include/midend/SysYIRGenerator.h

@@ -51,6 +51,7 @@ public:
                          Module *pModule, IRBuilder *pBuilder);
 
   static void initExternalFunction(Module *pModule, IRBuilder *pBuilder);
+  static void modify_timefuncname(Module *pModule);
 };
 
 class SysYIRGenerator : public SysYBaseVisitor {

src/midend/CMakeLists.txt

@@ -24,7 +24,6 @@ add_library(midend_lib STATIC
     Pass/Optimize/InductionVariableElimination.cpp
     Pass/Optimize/GlobalStrengthReduction.cpp
     Pass/Optimize/BuildCFG.cpp
-    Pass/Optimize/LargeArrayToGlobal.cpp
     Pass/Optimize/TailCallOpt.cpp
 )
 

src/midend/IR.cpp

@@ -757,7 +757,7 @@ void BinaryInst::print(std::ostream &os) const {
     auto lhs_hash = std::hash<const void*>{}(static_cast<const void*>(getLhs()));
     auto rhs_hash = std::hash<const void*>{}(static_cast<const void*>(getRhs()));
     size_t combined_hash = inst_hash ^ (lhs_hash << 1) ^ (rhs_hash << 2);
-    std::string tmpName = "tmp_icmp_" + std::to_string(combined_hash % 1000000);
+    std::string tmpName = "tmp_icmp_" + std::to_string(combined_hash % 1000000007);
     os << "%" << tmpName << " = " << getKindString() << " " << *getLhs()->getType() << " ";
     printOperand(os, getLhs());
     os << ", ";
@@ -772,7 +772,7 @@ void BinaryInst::print(std::ostream &os) const {
     auto lhs_hash = std::hash<const void*>{}(static_cast<const void*>(getLhs()));
     auto rhs_hash = std::hash<const void*>{}(static_cast<const void*>(getRhs()));
     size_t combined_hash = inst_hash ^ (lhs_hash << 1) ^ (rhs_hash << 2);
-    std::string tmpName = "tmp_fcmp_" + std::to_string(combined_hash % 1000000);
+    std::string tmpName = "tmp_fcmp_" + std::to_string(combined_hash % 1000000007);
     os << "%" << tmpName << " = " << getKindString() << " " << *getLhs()->getType() << " ";
     printOperand(os, getLhs());
     os << ", ";
@@ -834,7 +834,7 @@ void CondBrInst::print(std::ostream &os) const {
   if (condName.empty()) {
     // 使用条件值地址的哈希值作为唯一标识
     auto ptr_hash = std::hash<const void*>{}(static_cast<const void*>(condition));
-    condName = "const_" + std::to_string(ptr_hash % 100000);
+    condName = "const_" + std::to_string(ptr_hash % 1000000007);
   }
   
   // 组合指令地址、条件地址和目标块地址的哈希来确保唯一性
@@ -843,7 +843,7 @@ void CondBrInst::print(std::ostream &os) const {
   auto then_hash = std::hash<const void*>{}(static_cast<const void*>(getThenBlock()));
   auto else_hash = std::hash<const void*>{}(static_cast<const void*>(getElseBlock()));
   size_t combined_hash = inst_hash ^ (cond_hash << 1) ^ (then_hash << 2) ^ (else_hash << 3);
-  std::string uniqueSuffix = std::to_string(combined_hash % 1000000);
+  std::string uniqueSuffix = std::to_string(combined_hash % 1000000007);
   
   os << "%tmp_cond_" << condName << "_" << uniqueSuffix << " = icmp ne i32 ";
   printOperand(os, condition);

src/midend/Pass/Optimize/DCE.cpp

@@ -74,6 +74,7 @@ void DCEContext::run(Function *func, AnalysisManager *AM, bool &changed) {
       }
     }
   }
+  changed |= SysYIROptUtils::eliminateRedundantPhisInFunction(func); // 如果有活跃指令，则标记为已更改
 }
 
 // 判断指令是否是"天然活跃"的实现

src/midend/Pass/Optimize/GVN.cpp

@@ -39,7 +39,7 @@ bool GVN::runOnFunction(Function *func, AnalysisManager &AM) {
     }
     std::cout << "=== GVN completed for function: " << func->getName() << " ===" << std::endl;
   }
-
+  changed |= SysYIROptUtils::eliminateRedundantPhisInFunction(func);
   return changed;
 }
 

src/midend/Pass/Optimize/GlobalStrengthReduction.cpp

@@ -671,13 +671,13 @@ bool GlobalStrengthReductionContext::reduceDivision(BinaryInst *inst) {
   }
 
   // x / c = x * magic_number (魔数乘法优化 - 使用libdivide算法)
-  if (isConstantInt(rhs, constVal) && constVal > 1 && constVal != (uint32_t)(-1)) {
-    // auto magicPair = computeMulhMagicNumbers(static_cast<int>(constVal));
-    Value* magicResult = createMagicDivisionLibdivide(inst, static_cast<int>(constVal));
-    replaceWithOptimized(inst, magicResult);
-    divisionOptCount++;
-    return true;
-  }
+  // if (isConstantInt(rhs, constVal) && constVal > 1 && constVal != (uint32_t)(-1)) {
+  //   // auto magicPair = computeMulhMagicNumbers(static_cast<int>(constVal));
+  //   Value* magicResult = createMagicDivisionLibdivide(inst, static_cast<int>(constVal));
+  //   replaceWithOptimized(inst, magicResult);
+  //   divisionOptCount++;
+  //   return true;
+  // }
 
   return false;
 }

src/midend/Pass/Optimize/InductionVariableElimination.cpp

@@ -133,6 +133,7 @@ bool InductionVariableEliminationContext::run(Function* F, AnalysisManager& AM)
     printDebugInfo();
   }
 
+  modified |= SysYIROptUtils::eliminateRedundantPhisInFunction(F);
   return modified;
 }
 

src/midend/Pass/Optimize/LargeArrayToGlobal.cpp

@@ -1,145 +0,0 @@
-#include "../../include/midend/Pass/Optimize/LargeArrayToGlobal.h"
-#include "../../IR.h"
-#include <unordered_map>
-#include <sstream>
-#include <string>
-
-namespace sysy {
-
-// Helper function to convert type to string
-static std::string typeToString(Type *type) {
-    if (!type) return "null";
-    
-    switch (type->getKind()) {
-        case Type::kInt:
-            return "int";
-        case Type::kFloat:
-            return "float";
-        case Type::kPointer:
-            return "ptr";
-        case Type::kArray: {
-            auto *arrayType = type->as<ArrayType>();
-            return "[" + std::to_string(arrayType->getNumElements()) + " x " + 
-                   typeToString(arrayType->getElementType()) + "]";
-        }
-        default:
-            return "unknown";
-    }
-}
-
-void *LargeArrayToGlobalPass::ID = &LargeArrayToGlobalPass::ID;
-
-bool LargeArrayToGlobalPass::runOnModule(Module *M, AnalysisManager &AM) {
-        bool changed = false;
-        
-        if (!M) {
-            return false;
-        }
-
-        // Collect all alloca instructions from all functions
-        std::vector<std::pair<AllocaInst*, Function*>> allocasToConvert;
-        
-        for (auto &funcPair : M->getFunctions()) {
-            Function *F = funcPair.second.get();
-            if (!F || F->getBasicBlocks().begin() == F->getBasicBlocks().end()) {
-                continue;
-            }
-            
-            for (auto &BB : F->getBasicBlocks()) {
-                for (auto &inst : BB->getInstructions()) {
-                    if (auto *alloca = dynamic_cast<AllocaInst*>(inst.get())) {
-                        Type *allocatedType = alloca->getAllocatedType();
-                        
-                        // Calculate the size of the allocated type
-                        unsigned size = calculateTypeSize(allocatedType);
-                        if(DEBUG){
-                            // Debug: print size information
-                             std::cout << "LargeArrayToGlobalPass: Found alloca with size " << size 
-                                  << " for type " << typeToString(allocatedType) << std::endl;
-                        }
-                        
-                        // Convert arrays of 1KB (1024 bytes) or larger to global variables
-                        if (size >= 1024) {
-                            if(DEBUG)
-                                std::cout << "LargeArrayToGlobalPass: Converting array of size " << size << " to global" << std::endl;
-                            allocasToConvert.emplace_back(alloca, F);
-                        }
-                    }
-                }
-            }
-        }
-
-        // Convert the collected alloca instructions to global variables
-        for (auto [alloca, F] : allocasToConvert) {
-            convertAllocaToGlobal(alloca, F, M);
-            changed = true;
-        }
-
-return changed;
-    }
-
-unsigned LargeArrayToGlobalPass::calculateTypeSize(Type *type) {
-    if (!type) return 0;
-
-    switch (type->getKind()) {
-        case Type::kInt:
-        case Type::kFloat:
-            return 4;
-        case Type::kPointer:
-            return 8;
-        case Type::kArray: {
-            auto *arrayType = type->as<ArrayType>();
-            return arrayType->getNumElements() * calculateTypeSize(arrayType->getElementType());
-        }
-        default:
-            return 0;
-    }
-}
-
-void LargeArrayToGlobalPass::convertAllocaToGlobal(AllocaInst *alloca, Function *F, Module *M) {
-    Type *allocatedType = alloca->getAllocatedType();
-    
-    // Create a unique name for the global variable
-    std::string globalName = generateUniqueGlobalName(alloca, F);
-    
-    // Create the global variable - GlobalValue expects pointer type
-    Type *pointerType = Type::getPointerType(allocatedType);
-    GlobalValue *globalVar = M->createGlobalValue(globalName, pointerType);
-    
-    if (!globalVar) {
-        return;
-    }
-    
-    // Replace all uses of the alloca with the global variable
-    alloca->replaceAllUsesWith(globalVar);
-    
-    // Remove the alloca instruction from its basic block
-    for (auto &BB : F->getBasicBlocks()) {
-        auto &instructions = BB->getInstructions();
-        for (auto it = instructions.begin(); it != instructions.end(); ++it) {
-            if (it->get() == alloca) {
-                instructions.erase(it);
-                break;
-            }
-        }
-    }
-}
-
-std::string LargeArrayToGlobalPass::generateUniqueGlobalName(AllocaInst *alloca, Function *F) {
-    std::string baseName = alloca->getName();
-    if (baseName.empty()) {
-        baseName = "array";
-    }
-    
-    // Ensure uniqueness by appending function name and counter
-    static std::unordered_map<std::string, int> nameCounter;
-    std::string key = F->getName() + "." + baseName;
-    
-    int counter = nameCounter[key]++;
-    std::ostringstream oss;
-    oss << key << "." << counter;
-    
-    return oss.str();
-}
-
-} // namespace sysy

src/midend/Pass/Optimize/LoopStrengthReduction.cpp

@@ -661,9 +661,9 @@ bool StrengthReductionContext::replaceOriginalInstruction(StrengthReductionCandi
     
     case StrengthReductionCandidate::DIVIDE_CONST: {
       // 任意常数除法
-      builder->setPosition(candidate->containingBlock, 
-                          candidate->containingBlock->findInstIterator(candidate->originalInst));
-      replacementValue = generateConstantDivisionReplacement(candidate, builder);
+      // builder->setPosition(candidate->containingBlock, 
+      //                     candidate->containingBlock->findInstIterator(candidate->originalInst));
+      // replacementValue = generateConstantDivisionReplacement(candidate, builder);
       break;
     }
     
@@ -683,17 +683,19 @@ bool StrengthReductionContext::replaceOriginalInstruction(StrengthReductionCandi
         );
         
         // 检查原值是否为负数
-        Value* zero = ConstantInteger::get(0);
-        Value* isNegative = builder->createICmpLTInst(candidate->inductionVar, zero);
+        Value* shift31condidata = builder->createBinaryInst(
+          Instruction::Kind::kSra, candidate->inductionVar->getType(),
+          candidate->inductionVar, ConstantInteger::get(31)
+        );
         
         // 如果为负数，需要调整结果
-        Value* adjustment = ConstantInteger::get(candidate->multiplier);
-        Value* adjustedTemp = builder->createAddInst(temp, adjustment);
-        
-        // 使用条件分支来模拟select操作
-        // 为简化起见，这里先用一个更复杂但可工作的方式
-        // 实际应该创建条件分支，但这里先简化处理
-        replacementValue = temp; // 简化版本，假设大多数情况下不是负数
+        Value* adjustment = builder->createAndInst(shift31condidata, maskConstant);
+        Value* adjustedTemp = builder->createAddInst(candidate->inductionVar, adjustment);
+        Value* adjustedResult = builder->createBinaryInst(
+          Instruction::Kind::kAnd, candidate->inductionVar->getType(),
+          adjustedTemp, maskConstant
+        );
+        replacementValue = adjustedResult;
       } else {
         // 非负数的取模，直接使用位与
         replacementValue = builder->createBinaryInst(

src/midend/Pass/Optimize/Reg2Mem.cpp

@@ -70,20 +70,20 @@ void Reg2MemContext::allocateMemoryForSSAValues(Function *func) {
 
   // 1. 为函数参数分配内存
   builder->setPosition(entryBlock, entryBlock->begin()); // 确保在入口块的开始位置插入
-  for (auto arg : func->getArguments()) {
-    // 默认情况下，将所有参数是提升到内存
-    if (isPromotableToMemory(arg)) {
-      // 参数的类型就是 AllocaInst 需要分配的类型
-      AllocaInst *alloca = builder->createAllocaInst(Type::getPointerType(arg->getType()), arg->getName() + ".reg2mem");
-      // 将参数值 store 到 alloca 中 (这是 Mem2Reg 逆转的关键一步)
-      valueToAllocaMap[arg] = alloca;
+  // for (auto arg : func->getArguments()) {
+  //   // 默认情况下，将所有参数是提升到内存
+  //   if (isPromotableToMemory(arg)) {
+  //     // 参数的类型就是 AllocaInst 需要分配的类型
+  //     AllocaInst *alloca = builder->createAllocaInst(Type::getPointerType(arg->getType()), arg->getName() + ".reg2mem");
+  //     // 将参数值 store 到 alloca 中 (这是 Mem2Reg 逆转的关键一步)
+  //     valueToAllocaMap[arg] = alloca;
 
-      // 确保 alloca 位于入口块的顶部，但在所有参数的 store 指令之前
-      // 通常 alloca 都在 entry block 的最开始
-      // 这里我们只是创建，并让 builder 决定插入位置 (通常在当前插入点)
-      // 如果需要严格控制顺序，可能需要手动 insert 到 instruction list
-    }
-  }
+  //     // 确保 alloca 位于入口块的顶部，但在所有参数的 store 指令之前
+  //     // 通常 alloca 都在 entry block 的最开始
+  //     // 这里我们只是创建，并让 builder 决定插入位置 (通常在当前插入点)
+  //     // 如果需要严格控制顺序，可能需要手动 insert 到 instruction list
+  //   }
+  // }
 
   // 2. 为指令结果分配内存
   // 遍历所有基本块和指令，找出所有需要分配 Alloca 的指令结果
@@ -123,11 +123,11 @@ void Reg2MemContext::allocateMemoryForSSAValues(Function *func) {
   }
 
   // 插入所有参数的初始 Store 指令
-  for (auto arg : func->getArguments()) {
-      if (valueToAllocaMap.count(arg)) { // 检查是否为其分配了 alloca
-          builder->createStoreInst(arg, valueToAllocaMap[arg]);
-      }
-  }
+  // for (auto arg : func->getArguments()) {
+  //     if (valueToAllocaMap.count(arg)) { // 检查是否为其分配了 alloca
+  //         builder->createStoreInst(arg, valueToAllocaMap[arg]);
+  //     }
+  // }
   
   builder->setPosition(entryBlock, entryBlock->terminator());
 }

src/midend/Pass/Optimize/SCCP.cpp

@@ -1357,9 +1357,8 @@ void SCCPContext::run(Function *func, AnalysisManager &AM) {
   bool changed_control_flow = SimplifyControlFlow(func);
 
   // 如果任何一个阶段修改了 IR，标记分析结果为失效
-  if (changed_constant_propagation || changed_control_flow) {
-    // AM.invalidate(); // 假设有这样的方法来使所有分析结果失效
-  }
+  bool changed = changed_constant_propagation || changed_control_flow;
+  changed |= SysYIROptUtils::eliminateRedundantPhisInFunction(func);
 }
 
 // SCCP Pass methods

src/midend/Pass/Pass.cpp

@@ -13,7 +13,6 @@
 #include "GVN.h"
 #include "SCCP.h"
 #include "BuildCFG.h"
-#include "LargeArrayToGlobal.h"
 #include "LoopNormalization.h"
 #include "LICM.h"
 #include "LoopStrengthReduction.h"
@@ -61,8 +60,6 @@ void PassManager::runOptimizationPipeline(Module* moduleIR, IRBuilder* builderIR
 
     // 注册优化遍
     registerOptimizationPass<BuildCFG>();
-    registerOptimizationPass<LargeArrayToGlobalPass>();
-
     registerOptimizationPass<GVN>();
     
     registerOptimizationPass<SysYDelInstAfterBrPass>();
@@ -98,7 +95,6 @@ void PassManager::runOptimizationPipeline(Module* moduleIR, IRBuilder* builderIR
 
       this->clearPasses();
       this->addPass(&BuildCFG::ID);
-      this->addPass(&LargeArrayToGlobalPass::ID);
       this->run();
 
       this->clearPasses(); 
@@ -185,19 +181,19 @@ void PassManager::runOptimizationPipeline(Module* moduleIR, IRBuilder* builderIR
         printPasses();
       }
       
-      // this->clearPasses();
-      // this->addPass(&LoopStrengthReduction::ID);
-      // this->run();
+      this->clearPasses();
+      this->addPass(&LoopStrengthReduction::ID);
+      this->run();
 
       if(DEBUG) {
         std::cout << "=== IR After Loop Normalization, and Strength Reduction Optimizations ===\n";
         printPasses();
       }
 
-      // // 全局强度削弱优化，包括代数优化和魔数除法
-      // this->clearPasses();
-      // this->addPass(&GlobalStrengthReduction::ID);
-      // this->run();
+      // 全局强度削弱优化，包括代数优化和魔数除法
+      this->clearPasses();
+      this->addPass(&GlobalStrengthReduction::ID);
+      this->run();
 
       if(DEBUG) {
         std::cout << "=== IR After Global Strength Reduction Optimizations ===\n";

src/midend/SysYIRGenerator.cpp

@@ -674,6 +674,8 @@ std::any SysYIRGenerator::visitCompUnit(SysYParser::CompUnitContext *ctx) {
   pModule->enterNewScope();
   visitChildren(ctx);
   pModule->leaveScope();
+
+  Utils::modify_timefuncname(pModule);
   return pModule;
 }
 
@@ -2403,4 +2405,12 @@ void Utils::initExternalFunction(Module *pModule, IRBuilder *pBuilder) {
 
 }
 
+void Utils::modify_timefuncname(Module *pModule){
+  auto starttimeFunc = pModule->getExternalFunction("starttime");
+  auto stoptimeFunc = pModule->getExternalFunction("stoptime");
+  starttimeFunc->setName("_sysy_starttime");
+  stoptimeFunc->setName("_sysy_stoptime");
+
+}
+
 } // namespace sysy

src/sysyc.cpp

@@ -28,7 +28,7 @@ static string argStopAfter;
 static string argInputFile;
 static bool argFormat = false; // 目前未使用，但保留
 static string argOutputFilename;
-static int optLevel = 0; // 优化级别，默认为0 (不加-O参数时)
+int optLevel = 0; // 优化级别，默认为0 (不加-O参数时)
 
 void usage(int code) {
   const char *msg = "Usage: sysyc [options] inputfile\n\n"