[midend-LoopAnalysis]为项目添加别名分析遍，副作用分析遍，循环分析遍，循环特征分析遍
This commit is contained in:
rain2133
208
src/include/midend/Pass/Analysis/AliasAnalysis.h
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208
src/include/midend/Pass/Analysis/AliasAnalysis.h
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@@ -0,0 +1,208 @@
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#pragma once
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#include "IR.h"
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#include "Pass.h"
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#include <map>
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#include <set>
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#include <vector>
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#include <memory>
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namespace sysy {
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// 前向声明
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class MemoryLocation;
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class AliasAnalysisResult;
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/**
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* @brief 别名关系类型
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* 按风险等级递增排序
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*/
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enum class AliasType {
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NO_ALIAS = 0, // 确定无别名 (不同的局部数组)
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SELF_ALIAS = 1, // 自别名 (同一数组的不同索引)
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POSSIBLE_ALIAS = 2, // 可能有别名 (函数参数数组)
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UNKNOWN_ALIAS = 3 // 未知 (保守估计)
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};
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/**
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* @brief 内存位置信息
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* 描述一个内存访问的基础信息
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*/
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struct MemoryLocation {
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Value* basePointer; // 基指针 (剥离GEP后的真实基址)
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Value* accessPointer; // 访问指针 (包含索引信息)
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// 分类信息
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bool isLocalArray; // 是否为局部数组
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bool isFunctionParameter; // 是否为函数参数
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bool isGlobalArray; // 是否为全局数组
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// 索引信息
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std::vector<Value*> indices; // GEP索引列表
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bool hasConstantIndices; // 是否为常量索引
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bool hasLoopVariableIndex; // 是否包含循环变量
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int constantOffset; // 常量偏移量 (仅当全部为常量时有效)
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// 访问模式
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bool hasReads; // 是否有读操作
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bool hasWrites; // 是否有写操作
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std::vector<Instruction*> accessInsts; // 所有访问指令
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MemoryLocation(Value* base, Value* access)
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: basePointer(base), accessPointer(access),
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isLocalArray(false), isFunctionParameter(false), isGlobalArray(false),
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hasConstantIndices(false), hasLoopVariableIndex(false), constantOffset(0),
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hasReads(false), hasWrites(false) {}
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};
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/**
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* @brief 别名分析结果
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* 存储一个函数的完整别名分析信息
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*/
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class AliasAnalysisResult : public AnalysisResultBase {
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public:
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AliasAnalysisResult(Function *F) : AssociatedFunction(F) {}
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~AliasAnalysisResult() override = default;
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// ========== 基础查询接口 ==========
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/**
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* 查询两个指针之间的别名关系
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*/
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AliasType queryAlias(Value* ptr1, Value* ptr2) const;
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/**
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* 查询指针的内存位置信息
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*/
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const MemoryLocation* getMemoryLocation(Value* ptr) const;
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/**
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* 获取所有内存位置
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*/
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const std::map<Value*, std::unique_ptr<MemoryLocation>>& getAllMemoryLocations() const {
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return LocationMap;
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}
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// ========== 高级查询接口 ==========
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/**
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* 检查指针是否为局部数组
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*/
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bool isLocalArray(Value* ptr) const;
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/**
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* 检查指针是否为函数参数数组
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*/
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bool isFunctionParameter(Value* ptr) const;
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/**
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* 检查指针是否为全局数组
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*/
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bool isGlobalArray(Value* ptr) const;
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/**
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* 检查指针是否使用常量索引
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*/
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bool hasConstantAccess(Value* ptr) const;
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// ========== 统计接口 ==========
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/**
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* 获取各类别名类型的统计信息
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*/
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struct Statistics {
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int totalQueries;
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int noAlias;
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int selfAlias;
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int possibleAlias;
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int unknownAlias;
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int localArrays;
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int functionParameters;
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int globalArrays;
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int constantAccesses;
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};
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Statistics getStatistics() const;
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/**
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* 打印别名分析结果 (调试用)
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*/
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void print() const;
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// ========== 内部方法 ==========
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void addMemoryLocation(std::unique_ptr<MemoryLocation> location);
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void addAliasRelation(Value* ptr1, Value* ptr2, AliasType type);
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// ========== 公开数据成员 (供Pass使用) ==========
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std::map<Value*, std::unique_ptr<MemoryLocation>> LocationMap; // 内存位置映射
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std::map<std::pair<Value*, Value*>, AliasType> AliasMap; // 别名关系缓存
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private:
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Function *AssociatedFunction; // 关联的函数
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// 分类存储
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std::vector<Argument*> ArrayParameters; // 数组参数
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std::vector<AllocaInst*> LocalArrays; // 局部数组
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std::set<GlobalValue*> AccessedGlobals; // 访问的全局变量
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};
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/**
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* @brief SysY语言特化的别名分析Pass
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* 针对SysY语言特性优化的别名分析实现
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*/
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class SysYAliasAnalysisPass : public AnalysisPass {
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public:
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// 唯一的 Pass ID
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static void *ID;
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SysYAliasAnalysisPass() : AnalysisPass("SysYAliasAnalysis", Pass::Granularity::Function) {}
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// 实现 getPassID
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void *getPassID() const override { return &ID; }
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// 核心运行方法
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bool runOnFunction(Function *F, AnalysisManager &AM) override;
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// 获取分析结果
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std::unique_ptr<AnalysisResultBase> getResult() override { return std::move(CurrentResult); }
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private:
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std::unique_ptr<AliasAnalysisResult> CurrentResult; // 当前函数的分析结果
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// ========== 主要分析流程 ==========
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void collectMemoryAccesses(Function* F); // 收集内存访问
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void buildAliasRelations(Function* F); // 构建别名关系
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void optimizeForSysY(Function* F); // SysY特化优化
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// ========== 内存位置分析 ==========
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std::unique_ptr<MemoryLocation> createMemoryLocation(Value* ptr);
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Value* getBasePointer(Value* ptr); // 获取基指针
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void analyzeMemoryType(MemoryLocation* location); // 分析内存类型
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void analyzeIndexPattern(MemoryLocation* location); // 分析索引模式
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// ========== 别名关系推断 ==========
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AliasType analyzeAliasBetween(MemoryLocation* loc1, MemoryLocation* loc2);
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AliasType compareLocalArrays(MemoryLocation* loc1, MemoryLocation* loc2);
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AliasType compareParameters(MemoryLocation* loc1, MemoryLocation* loc2);
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AliasType compareWithGlobal(MemoryLocation* loc1, MemoryLocation* loc2);
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AliasType compareMixedTypes(MemoryLocation* loc1, MemoryLocation* loc2);
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// ========== SysY特化优化 ==========
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void applySysYConstraints(Function* F); // 应用SysY语言约束
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void optimizeParameterAnalysis(Function* F); // 优化参数分析
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void optimizeArrayAccessAnalysis(Function* F); // 优化数组访问分析
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// ========== 辅助方法 ==========
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bool isConstantValue(Value* val); // 是否为常量
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bool hasLoopVariableInIndices(const std::vector<Value*>& indices, Function* F);
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int calculateConstantOffset(const std::vector<Value*>& indices);
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void printStatistics() const; // 打印统计信息
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};
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} // namespace sysy
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@@ -4,8 +4,10 @@
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#include "IR.h" // 包含 IR 定义
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#include "Pass.h" // 包含 Pass 框架
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#include <algorithm>
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#include <functional>
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#include <map>
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#include <memory>
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#include <optional>
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#include <queue> // 用于循环体块的逆向遍历
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#include <set>
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#include <vector>
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@@ -92,6 +94,65 @@ public:
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return backEdgeCount == 1;
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}
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/**
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* 获取所有出口目标块 (循环外接收循环出口边的块)
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* 使用场景: 循环后置处理、phi节点分析
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*/
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std::vector<BasicBlock*> getExitTargetBlocks() const {
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std::set<BasicBlock*> exitTargetSet;
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for (BasicBlock* bb : LoopBlocks) {
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for (BasicBlock* succ : bb->getSuccessors()) {
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if (!contains(succ)) {
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exitTargetSet.insert(succ);
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}
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}
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}
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return std::vector<BasicBlock*>(exitTargetSet.begin(), exitTargetSet.end());
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}
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/**
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* 计算循环的"深度"相对于指定的祖先循环
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* 使用场景: 相对深度计算、嵌套分析
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*/
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int getRelativeDepth(Loop* ancestor) const {
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if (this == ancestor) return 0;
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int depth = 0;
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Loop* current = this->ParentLoop;
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while (current && current != ancestor) {
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depth++;
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current = current->ParentLoop;
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}
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return current == ancestor ? depth : -1; // -1表示不是祖先关系
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}
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/**
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* 检查循环是否包含函数调用
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* 使用场景: 内联决策、副作用分析
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*/
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bool containsFunctionCalls() const {
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for (BasicBlock* bb : LoopBlocks) {
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for (auto& inst : bb->getInstructions()) {
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if (dynamic_cast<CallInst*>(inst.get())) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* 估算循环的"热度" (基于嵌套深度和大小)
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* 使用场景: 优化优先级、资源分配
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*/
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double getLoopHotness() const {
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// 简单的热度估算: 深度权重 + 大小惩罚
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double hotness = std::pow(2.0, Level); // 深度越深越热
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hotness /= std::sqrt(LoopBlocks.size()); // 大小越大相对热度降低
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return hotness;
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}
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// --- 供 LoopAnalysisPass 内部调用的方法，用于构建 Loop 对象 ---
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void addBlock(BasicBlock *BB) { LoopBlocks.insert(BB); }
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void addExitBlock(BasicBlock *BB) { ExitBlocks.insert(BB); }
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@@ -112,81 +173,345 @@ private:
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/**
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* @brief 循环分析结果类。
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* 包含一个函数中所有识别出的循环。
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* 包含一个函数中所有识别出的循环，并提供高效的查询缓存机制。
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*/
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class LoopAnalysisResult : public AnalysisResultBase {
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public:
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LoopAnalysisResult(Function *F) : AssociatedFunction(F) {}
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~LoopAnalysisResult() override = default;
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// ========== 缓存统计结构 ==========
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struct CacheStats {
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size_t innermostLoopsCached;
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size_t outermostLoopsCached;
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size_t loopsByDepthCached;
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size_t containingLoopsCached;
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size_t allNestedLoopsCached;
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size_t totalCachedQueries;
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};
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private:
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// ========== 高频查询缓存 (必须缓存) ==========
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mutable std::optional<std::vector<Loop*>> cachedInnermostLoops;
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mutable std::optional<std::vector<Loop*>> cachedOutermostLoops;
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mutable std::optional<int> cachedMaxDepth;
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mutable std::optional<size_t> cachedLoopCount;
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mutable std::map<int, std::vector<Loop*>> cachedLoopsByDepth;
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// ========== 中频查询缓存 (选择性缓存) ==========
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mutable std::map<BasicBlock*, Loop*> cachedInnermostContainingLoop;
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mutable std::map<Loop*, std::set<Loop*>> cachedAllNestedLoops; // 递归嵌套
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mutable std::map<BasicBlock*, std::vector<Loop*>> cachedAllContainingLoops;
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// ========== 缓存状态管理 ==========
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mutable bool cacheValid = true;
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// 内部辅助方法
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void invalidateCache() const {
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cachedInnermostLoops.reset();
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cachedOutermostLoops.reset();
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cachedMaxDepth.reset();
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cachedLoopCount.reset();
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cachedLoopsByDepth.clear();
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cachedInnermostContainingLoop.clear();
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cachedAllNestedLoops.clear();
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cachedAllContainingLoops.clear();
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cacheValid = false;
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}
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void ensureCacheValid() const {
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if (!cacheValid) {
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// 重新计算基础缓存
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computeBasicCache();
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cacheValid = true;
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}
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}
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void computeBasicCache() const {
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// 计算最内层循环
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if (!cachedInnermostLoops) {
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cachedInnermostLoops = std::vector<Loop*>();
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for (const auto& loop : AllLoops) {
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if (loop->isInnermost()) {
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cachedInnermostLoops->push_back(loop.get());
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}
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}
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}
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// 计算最外层循环
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if (!cachedOutermostLoops) {
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cachedOutermostLoops = std::vector<Loop*>();
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for (const auto& loop : AllLoops) {
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if (loop->isOutermost()) {
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cachedOutermostLoops->push_back(loop.get());
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}
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}
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}
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// 计算最大深度
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if (!cachedMaxDepth) {
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int maxDepth = 0;
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for (const auto& loop : AllLoops) {
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maxDepth = std::max(maxDepth, loop->getLoopDepth());
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}
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cachedMaxDepth = maxDepth;
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}
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// 计算循环总数
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if (!cachedLoopCount) {
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cachedLoopCount = AllLoops.size();
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}
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}
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public:
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// ========== 基础接口 (保持向后兼容，但增加缓存失效) ==========
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// 添加一个识别出的循环到结果中
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void addLoop(std::unique_ptr<Loop> loop) {
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invalidateCache(); // 添加新循环时失效缓存
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AllLoops.push_back(std::move(loop));
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// 也可以选择将 Loop* 存储到 map 中，方便通过 header 查找
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LoopMap[AllLoops.back()->getHeader()] = AllLoops.back().get();
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}
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// 获取所有识别出的循环（unique_ptr 管理内存）
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const std::vector<std::unique_ptr<Loop>> &getAllLoops() const { return AllLoops; }
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// 获取所有最外层循环
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const std::vector<Loop *> &getOutermostLoops() const { return OutermostLoops; }
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const std::vector<Loop *> &getInnermostLoops() const { return InnermostLoops; }
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// 获取循环总数
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size_t getLoopCount() const { return AllLoops.size(); }
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// 获取最大循环嵌套深度
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int getMaxLoopDepth() const {
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int maxDepth = 0;
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for (const auto& loop : AllLoops) {
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if (loop->getLoopDepth() > maxDepth) {
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maxDepth = loop->getLoopDepth();
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// ========== 高频查询接口 (缓存优化) ==========
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/**
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* 获取所有最内层循环 - 循环优化的主要目标
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* 使用场景: 循环展开、向量化、循环不变量外提
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*/
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const std::vector<Loop*>& getInnermostLoops() const {
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ensureCacheValid();
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if (!cachedInnermostLoops) {
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cachedInnermostLoops = std::vector<Loop*>();
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for (const auto& loop : AllLoops) {
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if (loop->isInnermost()) {
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cachedInnermostLoops->push_back(loop.get());
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}
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}
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}
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return maxDepth;
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return *cachedInnermostLoops;
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}
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/**
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* 获取所有最外层循环
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* 使用场景: 循环树遍历、整体优化策略
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*/
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const std::vector<Loop*>& getOutermostLoops() const {
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ensureCacheValid();
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if (!cachedOutermostLoops) {
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cachedOutermostLoops = std::vector<Loop*>();
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for (const auto& loop : AllLoops) {
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if (loop->isOutermost()) {
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cachedOutermostLoops->push_back(loop.get());
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}
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}
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}
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return *cachedOutermostLoops;
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}
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/**
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* 获取指定深度的所有循环
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* 使用场景: 分层优化、循环展开决策、并行化分析
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*/
|
||||
const std::vector<Loop*>& getLoopsAtDepth(int depth) const {
|
||||
ensureCacheValid();
|
||||
if (cachedLoopsByDepth.find(depth) == cachedLoopsByDepth.end()) {
|
||||
std::vector<Loop*> result;
|
||||
for (const auto& loop : AllLoops) {
|
||||
if (loop->getLoopDepth() == depth) {
|
||||
result.push_back(loop.get());
|
||||
}
|
||||
}
|
||||
cachedLoopsByDepth[depth] = std::move(result);
|
||||
}
|
||||
return cachedLoopsByDepth[depth];
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取最大循环嵌套深度
|
||||
* 使用场景: 优化预算分配、编译时间控制
|
||||
*/
|
||||
int getMaxLoopDepth() const {
|
||||
ensureCacheValid();
|
||||
if (!cachedMaxDepth) {
|
||||
int maxDepth = 0;
|
||||
for (const auto& loop : AllLoops) {
|
||||
maxDepth = std::max(maxDepth, loop->getLoopDepth());
|
||||
}
|
||||
cachedMaxDepth = maxDepth;
|
||||
}
|
||||
return *cachedMaxDepth;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取循环总数
|
||||
* 使用场景: 统计信息、优化决策
|
||||
*/
|
||||
size_t getLoopCount() const {
|
||||
ensureCacheValid();
|
||||
if (!cachedLoopCount) {
|
||||
cachedLoopCount = AllLoops.size();
|
||||
}
|
||||
return *cachedLoopCount;
|
||||
}
|
||||
|
||||
// 获取指定深度的循环数量
|
||||
size_t getLoopCountAtDepth(int depth) const {
|
||||
size_t count = 0;
|
||||
for (const auto& loop : AllLoops) {
|
||||
if (loop->getLoopDepth() == depth) {
|
||||
count++;
|
||||
}
|
||||
}
|
||||
return count;
|
||||
return getLoopsAtDepth(depth).size();
|
||||
}
|
||||
|
||||
// 检查函数是否包含循环
|
||||
bool hasLoops() const { return !AllLoops.empty(); }
|
||||
|
||||
// ========== 中频查询接口 (选择性缓存) ==========
|
||||
|
||||
/**
|
||||
* 获取包含指定基本块的最内层循环
|
||||
* 使用场景: 活跃性分析、寄存器分配、指令调度
|
||||
*/
|
||||
Loop* getInnermostContainingLoop(BasicBlock* BB) const {
|
||||
ensureCacheValid();
|
||||
if (cachedInnermostContainingLoop.find(BB) == cachedInnermostContainingLoop.end()) {
|
||||
Loop* result = nullptr;
|
||||
int maxDepth = -1;
|
||||
for (const auto& loop : AllLoops) {
|
||||
if (loop->contains(BB) && loop->getLoopDepth() > maxDepth) {
|
||||
result = loop.get();
|
||||
maxDepth = loop->getLoopDepth();
|
||||
}
|
||||
}
|
||||
cachedInnermostContainingLoop[BB] = result;
|
||||
}
|
||||
return cachedInnermostContainingLoop[BB];
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取包含指定基本块的所有循环 (从外到内排序)
|
||||
* 使用场景: 循环间优化、依赖分析
|
||||
*/
|
||||
const std::vector<Loop*>& getAllContainingLoops(BasicBlock* BB) const {
|
||||
ensureCacheValid();
|
||||
if (cachedAllContainingLoops.find(BB) == cachedAllContainingLoops.end()) {
|
||||
std::vector<Loop*> result;
|
||||
for (const auto& loop : AllLoops) {
|
||||
if (loop->contains(BB)) {
|
||||
result.push_back(loop.get());
|
||||
}
|
||||
}
|
||||
// 按深度排序 (外层到内层)
|
||||
std::sort(result.begin(), result.end(),
|
||||
[](Loop* a, Loop* b) { return a->getLoopDepth() < b->getLoopDepth(); });
|
||||
cachedAllContainingLoops[BB] = std::move(result);
|
||||
}
|
||||
return cachedAllContainingLoops[BB];
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取指定循环的所有嵌套子循环 (递归)
|
||||
* 使用场景: 循环树分析、嵌套优化
|
||||
*/
|
||||
const std::set<Loop*>& getAllNestedLoops(Loop* loop) const {
|
||||
ensureCacheValid();
|
||||
if (cachedAllNestedLoops.find(loop) == cachedAllNestedLoops.end()) {
|
||||
std::set<Loop*> result;
|
||||
std::function<void(Loop*)> collectNested = [&](Loop* current) {
|
||||
for (Loop* nested : current->getNestedLoops()) {
|
||||
result.insert(nested);
|
||||
collectNested(nested); // 递归收集
|
||||
}
|
||||
};
|
||||
collectNested(loop);
|
||||
cachedAllNestedLoops[loop] = std::move(result);
|
||||
}
|
||||
return cachedAllNestedLoops[loop];
|
||||
}
|
||||
|
||||
// ========== 低频查询接口 (按需计算，不缓存) ==========
|
||||
|
||||
/**
|
||||
* 检查两个循环是否有嵌套关系
|
||||
* 使用场景: 循环间依赖分析
|
||||
*/
|
||||
bool isNestedLoop(Loop* inner, Loop* outer) const {
|
||||
if (inner == outer) return false;
|
||||
|
||||
Loop* current = inner->getParentLoop();
|
||||
while (current) {
|
||||
if (current == outer) return true;
|
||||
current = current->getParentLoop();
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取两个循环的最近公共祖先循环
|
||||
* 使用场景: 循环融合分析、优化范围确定
|
||||
*/
|
||||
Loop* getLowestCommonAncestor(Loop* loop1, Loop* loop2) const {
|
||||
if (!loop1 || !loop2) return nullptr;
|
||||
if (loop1 == loop2) return loop1;
|
||||
|
||||
// 收集loop1的所有祖先
|
||||
std::set<Loop*> ancestors1;
|
||||
Loop* current = loop1;
|
||||
while (current) {
|
||||
ancestors1.insert(current);
|
||||
current = current->getParentLoop();
|
||||
}
|
||||
|
||||
// 查找loop2祖先链中第一个在ancestors1中的循环
|
||||
current = loop2;
|
||||
while (current) {
|
||||
if (ancestors1.count(current)) {
|
||||
return current;
|
||||
}
|
||||
current = current->getParentLoop();
|
||||
}
|
||||
|
||||
return nullptr; // 没有公共祖先
|
||||
}
|
||||
|
||||
// 通过循环头获取 Loop 对象
|
||||
Loop *getLoopForHeader(BasicBlock *header) const {
|
||||
auto it = LoopMap.find(header);
|
||||
return (it != LoopMap.end()) ? it->second : nullptr;
|
||||
}
|
||||
|
||||
// 通过某个基本块获取包含它的最内层循环
|
||||
// 通过某个基本块获取包含它的最内层循环 (向后兼容接口)
|
||||
Loop *getLoopContainingBlock(BasicBlock *BB) const {
|
||||
// 遍历所有循环，找到包含 BB 且层级最深的循环
|
||||
Loop *innermostContainingLoop = nullptr;
|
||||
for (const auto &loop_ptr : AllLoops) {
|
||||
if (loop_ptr->contains(BB)) {
|
||||
if (!innermostContainingLoop || loop_ptr->getLoopLevel() > innermostContainingLoop->getLoopLevel()) {
|
||||
innermostContainingLoop = loop_ptr.get();
|
||||
}
|
||||
}
|
||||
}
|
||||
return innermostContainingLoop;
|
||||
return getInnermostContainingLoop(BB);
|
||||
}
|
||||
|
||||
// --- 供 LoopAnalysisPass 内部调用的方法，用于构建 LoopAnalysisResult 对象 ---
|
||||
void addOutermostLoop(Loop *loop) { OutermostLoops.push_back(loop); }
|
||||
void addInnermostLoop(Loop *loop) { InnermostLoops.push_back(loop); }
|
||||
void clearOutermostLoops() { OutermostLoops.clear(); }
|
||||
void clearInnermostLoops() { InnermostLoops.clear(); }
|
||||
// ========== 缓存管理接口 ==========
|
||||
|
||||
/**
|
||||
* 手动失效缓存 (当IR结构改变时调用)
|
||||
*/
|
||||
void invalidateQueryCache() const {
|
||||
invalidateCache();
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取缓存统计信息 (用于性能调试)
|
||||
*/
|
||||
CacheStats getCacheStats() const {
|
||||
CacheStats stats = {};
|
||||
stats.innermostLoopsCached = cachedInnermostLoops.has_value() ? 1 : 0;
|
||||
stats.outermostLoopsCached = cachedOutermostLoops.has_value() ? 1 : 0;
|
||||
stats.loopsByDepthCached = cachedLoopsByDepth.size();
|
||||
stats.containingLoopsCached = cachedInnermostContainingLoop.size();
|
||||
stats.allNestedLoopsCached = cachedAllNestedLoops.size();
|
||||
stats.totalCachedQueries = stats.innermostLoopsCached + stats.outermostLoopsCached +
|
||||
stats.loopsByDepthCached + stats.containingLoopsCached +
|
||||
stats.allNestedLoopsCached;
|
||||
return stats;
|
||||
}
|
||||
|
||||
// --- 保留的内部接口 ---
|
||||
// 注意：由于使用了缓存机制，不再需要手动维护最外层和最内层循环列表
|
||||
|
||||
// 打印分析结果
|
||||
void print() const;
|
||||
@@ -197,8 +522,7 @@ private:
|
||||
Function *AssociatedFunction; // 结果关联的函数
|
||||
std::vector<std::unique_ptr<Loop>> AllLoops; // 所有识别出的循环
|
||||
std::map<BasicBlock *, Loop *> LoopMap; // 循环头到 Loop* 的映射，方便查找
|
||||
std::vector<Loop *> OutermostLoops; // 最外层循环的列表
|
||||
std::vector<Loop *> InnermostLoops; // 最内层循环的列表
|
||||
// 注意: 最外层和最内层循环列表已移除，现在通过缓存机制动态计算
|
||||
};
|
||||
|
||||
/**
|
||||
|
||||
301
src/include/midend/Pass/Analysis/LoopCharacteristics.h
Normal file
301
src/include/midend/Pass/Analysis/LoopCharacteristics.h
Normal file
@@ -0,0 +1,301 @@
|
||||
#pragma once
|
||||
|
||||
#include "Dom.h" // 支配树分析依赖
|
||||
#include "Loop.h" // 循环分析依赖
|
||||
#include "Liveness.h" // 活跃性分析依赖
|
||||
#include "AliasAnalysis.h" // 别名分析依赖
|
||||
#include "IR.h" // IR定义
|
||||
#include "Pass.h" // Pass框架
|
||||
#include <algorithm>
|
||||
#include <map>
|
||||
#include <memory>
|
||||
#include <optional>
|
||||
#include <set>
|
||||
#include <vector>
|
||||
|
||||
namespace sysy {
|
||||
|
||||
// 前向声明
|
||||
class LoopCharacteristicsResult;
|
||||
|
||||
/**
|
||||
* @brief 循环特征信息结构
|
||||
* 存储单个循环的各种特征信息
|
||||
*/
|
||||
struct LoopCharacteristics {
|
||||
Loop* loop; // 关联的循环对象
|
||||
|
||||
// ========== 归纳变量分析 ==========
|
||||
std::vector<Value*> basicInductionVars; // 基本归纳变量 (i = phi(init, i+step))
|
||||
std::vector<Value*> derivedInductionVars; // 派生归纳变量 (j = i * scale + offset)
|
||||
std::map<Value*, int> inductionSteps; // 归纳变量的步长
|
||||
std::map<Value*, Value*> inductionInits; // 归纳变量的初始值
|
||||
|
||||
// ========== 循环不变量分析 ==========
|
||||
std::set<Value*> loopInvariants; // 循环不变量 (循环内定义但值不变)
|
||||
std::set<Instruction*> invariantInsts; // 不变指令 (可以外提的指令)
|
||||
|
||||
// ========== 循环边界分析 ==========
|
||||
std::optional<int> staticTripCount; // 静态可确定的循环次数
|
||||
Value* dynamicTripCountExpr; // 动态循环次数表达式
|
||||
bool hasKnownBounds; // 是否有已知边界
|
||||
Value* lowerBound; // 循环下界
|
||||
Value* upperBound; // 循环上界
|
||||
|
||||
// ========== 循环形式分析 ==========
|
||||
bool isCountingLoop; // 是否为计数循环 (for i=0; i<n; i++)
|
||||
bool isSimpleForLoop; // 是否为简单for循环
|
||||
bool hasComplexControlFlow; // 是否有复杂控制流 (break, continue)
|
||||
bool isInnermost; // 是否为最内层循环
|
||||
bool isParallel; // 是否可并行化
|
||||
|
||||
// ========== 内存访问模式 ==========
|
||||
struct MemoryAccessPattern {
|
||||
bool isSequential; // 是否顺序访问 (a[i], a[i+1], ...)
|
||||
bool isStrided; // 是否跨步访问 (a[2*i], a[3*i], ...)
|
||||
int stride; // 访问步长
|
||||
std::vector<Instruction*> loadInsts; // load指令列表
|
||||
std::vector<Instruction*> storeInsts; // store指令列表
|
||||
|
||||
// 使用外部别名分析结果
|
||||
AliasType aliasType; // 别名类型（来自别名分析）
|
||||
bool isArrayParameter; // 是否为数组参数访问
|
||||
bool isGlobalArray; // 是否为全局数组访问
|
||||
bool hasConstantIndices; // 是否使用常量索引
|
||||
};
|
||||
std::map<Value*, MemoryAccessPattern> memoryPatterns; // 内存访问模式
|
||||
|
||||
// ========== 循环优化提示 ==========
|
||||
bool benefitsFromUnrolling; // 是否适合循环展开
|
||||
bool benefitsFromVectorization; // 是否适合向量化
|
||||
bool benefitsFromTiling; // 是否适合分块
|
||||
int suggestedUnrollFactor; // 建议的展开因子
|
||||
|
||||
// ========== 性能特征 ==========
|
||||
size_t instructionCount; // 循环体指令数
|
||||
size_t memoryOperationCount; // 内存操作数
|
||||
size_t arithmeticOperationCount; // 算术操作数
|
||||
double computeToMemoryRatio; // 计算与内存操作比率
|
||||
|
||||
// 构造函数
|
||||
LoopCharacteristics(Loop* l) : loop(l), dynamicTripCountExpr(nullptr),
|
||||
hasKnownBounds(false), lowerBound(nullptr), upperBound(nullptr),
|
||||
isCountingLoop(false), isSimpleForLoop(false), hasComplexControlFlow(false),
|
||||
isInnermost(false), isParallel(false), benefitsFromUnrolling(false),
|
||||
benefitsFromVectorization(false), benefitsFromTiling(false),
|
||||
suggestedUnrollFactor(1), instructionCount(0), memoryOperationCount(0),
|
||||
arithmeticOperationCount(0), computeToMemoryRatio(0.0) {}
|
||||
};
|
||||
|
||||
/**
|
||||
* @brief 循环特征分析结果类
|
||||
* 包含函数中所有循环的特征信息，并提供查询接口
|
||||
*/
|
||||
class LoopCharacteristicsResult : public AnalysisResultBase {
|
||||
public:
|
||||
LoopCharacteristicsResult(Function *F) : AssociatedFunction(F) {}
|
||||
~LoopCharacteristicsResult() override = default;
|
||||
|
||||
// ========== 基础接口 ==========
|
||||
|
||||
/**
|
||||
* 添加循环特征信息
|
||||
*/
|
||||
void addLoopCharacteristics(std::unique_ptr<LoopCharacteristics> characteristics) {
|
||||
auto* loop = characteristics->loop;
|
||||
CharacteristicsMap[loop] = std::move(characteristics);
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取指定循环的特征信息
|
||||
*/
|
||||
const LoopCharacteristics* getCharacteristics(Loop* loop) const {
|
||||
auto it = CharacteristicsMap.find(loop);
|
||||
return (it != CharacteristicsMap.end()) ? it->second.get() : nullptr;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取所有循环特征信息
|
||||
*/
|
||||
const std::map<Loop*, std::unique_ptr<LoopCharacteristics>>& getAllCharacteristics() const {
|
||||
return CharacteristicsMap;
|
||||
}
|
||||
|
||||
// ========== 查询接口 ==========
|
||||
|
||||
/**
|
||||
* 获取所有计数循环
|
||||
*/
|
||||
std::vector<Loop*> getCountingLoops() const {
|
||||
std::vector<Loop*> result;
|
||||
for (const auto& [loop, chars] : CharacteristicsMap) {
|
||||
if (chars->isCountingLoop) {
|
||||
result.push_back(loop);
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取所有可向量化循环
|
||||
*/
|
||||
std::vector<Loop*> getVectorizableLoops() const {
|
||||
std::vector<Loop*> result;
|
||||
for (const auto& [loop, chars] : CharacteristicsMap) {
|
||||
if (chars->benefitsFromVectorization) {
|
||||
result.push_back(loop);
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取所有适合展开的循环
|
||||
*/
|
||||
std::vector<Loop*> getUnrollCandidateLoops() const {
|
||||
std::vector<Loop*> result;
|
||||
for (const auto& [loop, chars] : CharacteristicsMap) {
|
||||
if (chars->benefitsFromUnrolling) {
|
||||
result.push_back(loop);
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取所有可并行化循环
|
||||
*/
|
||||
std::vector<Loop*> getParallelizableLoops() const {
|
||||
std::vector<Loop*> result;
|
||||
for (const auto& [loop, chars] : CharacteristicsMap) {
|
||||
if (chars->isParallel) {
|
||||
result.push_back(loop);
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取所有有静态已知循环次数的循环
|
||||
*/
|
||||
std::vector<Loop*> getStaticBoundLoops() const {
|
||||
std::vector<Loop*> result;
|
||||
for (const auto& [loop, chars] : CharacteristicsMap) {
|
||||
if (chars->staticTripCount.has_value()) {
|
||||
result.push_back(loop);
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* 根据热度排序循环 (用于优化优先级)
|
||||
*/
|
||||
std::vector<Loop*> getLoopsByHotness() const {
|
||||
std::vector<Loop*> result;
|
||||
for (const auto& [loop, chars] : CharacteristicsMap) {
|
||||
result.push_back(loop);
|
||||
}
|
||||
|
||||
// 按循环热度排序 (嵌套深度 + 循环次数 + 指令数)
|
||||
std::sort(result.begin(), result.end(), [](Loop* a, Loop* b) {
|
||||
double hotnessA = a->getLoopHotness();
|
||||
double hotnessB = b->getLoopHotness();
|
||||
return hotnessA > hotnessB; // 降序排列
|
||||
});
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
// ========== 统计接口 ==========
|
||||
|
||||
/**
|
||||
* 获取优化候选统计
|
||||
*/
|
||||
struct OptimizationStats {
|
||||
size_t totalLoops;
|
||||
size_t countingLoops;
|
||||
size_t vectorizableLoops;
|
||||
size_t unrollCandidates;
|
||||
size_t parallelizableLoops;
|
||||
size_t staticBoundLoops;
|
||||
double avgInstructionCount;
|
||||
double avgComputeMemoryRatio;
|
||||
};
|
||||
|
||||
OptimizationStats getOptimizationStats() const {
|
||||
OptimizationStats stats = {};
|
||||
stats.totalLoops = CharacteristicsMap.size();
|
||||
|
||||
size_t totalInstructions = 0;
|
||||
double totalComputeMemoryRatio = 0.0;
|
||||
|
||||
for (const auto& [loop, chars] : CharacteristicsMap) {
|
||||
if (chars->isCountingLoop) stats.countingLoops++;
|
||||
if (chars->benefitsFromVectorization) stats.vectorizableLoops++;
|
||||
if (chars->benefitsFromUnrolling) stats.unrollCandidates++;
|
||||
if (chars->isParallel) stats.parallelizableLoops++;
|
||||
if (chars->staticTripCount.has_value()) stats.staticBoundLoops++;
|
||||
|
||||
totalInstructions += chars->instructionCount;
|
||||
totalComputeMemoryRatio += chars->computeToMemoryRatio;
|
||||
}
|
||||
|
||||
if (stats.totalLoops > 0) {
|
||||
stats.avgInstructionCount = static_cast<double>(totalInstructions) / stats.totalLoops;
|
||||
stats.avgComputeMemoryRatio = totalComputeMemoryRatio / stats.totalLoops;
|
||||
}
|
||||
|
||||
return stats;
|
||||
}
|
||||
|
||||
// 打印分析结果
|
||||
void print() const;
|
||||
|
||||
private:
|
||||
Function *AssociatedFunction; // 关联的函数
|
||||
std::map<Loop*, std::unique_ptr<LoopCharacteristics>> CharacteristicsMap; // 循环特征映射
|
||||
};
|
||||
|
||||
/**
|
||||
* @brief 循环特征分析遍
|
||||
* 基于循环分析结果，分析每个循环的特征信息，为优化决策提供依据
|
||||
*/
|
||||
class LoopCharacteristicsPass : public AnalysisPass {
|
||||
public:
|
||||
// 唯一的 Pass ID
|
||||
static void *ID;
|
||||
|
||||
LoopCharacteristicsPass() : AnalysisPass("LoopCharacteristics", Pass::Granularity::Function) {}
|
||||
|
||||
// 实现 getPassID
|
||||
void *getPassID() const override { return &ID; }
|
||||
|
||||
// 核心运行方法
|
||||
bool runOnFunction(Function *F, AnalysisManager &AM) override;
|
||||
|
||||
// 获取分析结果
|
||||
std::unique_ptr<AnalysisResultBase> getResult() override { return std::move(CurrentResult); }
|
||||
|
||||
private:
|
||||
std::unique_ptr<LoopCharacteristicsResult> CurrentResult; // 当前函数的分析结果
|
||||
|
||||
// 内部分析方法
|
||||
void analyzeLoop(Loop* loop, LoopCharacteristics* characteristics, AnalysisManager &AM);
|
||||
void identifyInductionVariables(Loop* loop, LoopCharacteristics* characteristics);
|
||||
void identifyLoopInvariants(Loop* loop, LoopCharacteristics* characteristics);
|
||||
void analyzeLoopBounds(Loop* loop, LoopCharacteristics* characteristics);
|
||||
void analyzeLoopForm(Loop* loop, LoopCharacteristics* characteristics);
|
||||
void analyzeMemoryAccessPatterns(Loop* loop, LoopCharacteristics* characteristics);
|
||||
void evaluateOptimizationOpportunities(Loop* loop, LoopCharacteristics* characteristics);
|
||||
void computePerformanceMetrics(Loop* loop, LoopCharacteristics* characteristics);
|
||||
|
||||
// 辅助方法
|
||||
bool isInductionVariable(Value* val, Loop* loop);
|
||||
bool isLoopInvariant(Value* val, Loop* loop);
|
||||
bool hasLoopCarriedDependence(Loop* loop);
|
||||
int estimateUnrollFactor(Loop* loop);
|
||||
bool benefitsFromVectorization(Loop* loop);
|
||||
};
|
||||
|
||||
} // namespace sysy
|
||||
126
src/include/midend/Pass/Analysis/SideEffectAnalysis.h
Normal file
126
src/include/midend/Pass/Analysis/SideEffectAnalysis.h
Normal file
@@ -0,0 +1,126 @@
|
||||
#pragma once
|
||||
|
||||
#include "Pass.h"
|
||||
#include "IR.h"
|
||||
#include "AliasAnalysis.h"
|
||||
#include <unordered_set>
|
||||
#include <unordered_map>
|
||||
|
||||
namespace sysy {
|
||||
|
||||
// 副作用类型枚举
|
||||
enum class SideEffectType {
|
||||
NO_SIDE_EFFECT, // 无副作用
|
||||
MEMORY_WRITE, // 内存写入（store、memset）
|
||||
FUNCTION_CALL, // 函数调用（可能有任意副作用）
|
||||
IO_OPERATION, // I/O操作（printf、scanf等）
|
||||
UNKNOWN // 未知副作用
|
||||
};
|
||||
|
||||
// 副作用信息结构
|
||||
struct SideEffectInfo {
|
||||
SideEffectType type = SideEffectType::NO_SIDE_EFFECT;
|
||||
bool mayModifyGlobal = false; // 可能修改全局变量
|
||||
bool mayModifyMemory = false; // 可能修改内存
|
||||
bool mayCallFunction = false; // 可能调用函数
|
||||
bool isPure = true; // 是否为纯函数（无副作用且结果只依赖参数）
|
||||
|
||||
// 合并两个副作用信息
|
||||
SideEffectInfo merge(const SideEffectInfo& other) const {
|
||||
SideEffectInfo result;
|
||||
result.type = (type == SideEffectType::NO_SIDE_EFFECT) ? other.type : type;
|
||||
result.mayModifyGlobal = mayModifyGlobal || other.mayModifyGlobal;
|
||||
result.mayModifyMemory = mayModifyMemory || other.mayModifyMemory;
|
||||
result.mayCallFunction = mayCallFunction || other.mayCallFunction;
|
||||
result.isPure = isPure && other.isPure;
|
||||
return result;
|
||||
}
|
||||
};
|
||||
|
||||
// 副作用分析结果类
|
||||
class SideEffectAnalysisResult : public AnalysisResultBase {
|
||||
private:
|
||||
// 指令级别的副作用信息
|
||||
std::unordered_map<Instruction*, SideEffectInfo> instructionSideEffects;
|
||||
|
||||
// 函数级别的副作用信息
|
||||
std::unordered_map<Function*, SideEffectInfo> functionSideEffects;
|
||||
|
||||
// 已知的SysY标准库函数副作用信息
|
||||
std::unordered_map<std::string, SideEffectInfo> knownFunctions;
|
||||
|
||||
public:
|
||||
SideEffectAnalysisResult();
|
||||
virtual ~SideEffectAnalysisResult() noexcept override = default;
|
||||
|
||||
// 获取指令的副作用信息
|
||||
const SideEffectInfo& getInstructionSideEffect(Instruction* inst) const;
|
||||
|
||||
// 获取函数的副作用信息
|
||||
const SideEffectInfo& getFunctionSideEffect(Function* func) const;
|
||||
|
||||
// 设置指令的副作用信息
|
||||
void setInstructionSideEffect(Instruction* inst, const SideEffectInfo& info);
|
||||
|
||||
// 设置函数的副作用信息
|
||||
void setFunctionSideEffect(Function* func, const SideEffectInfo& info);
|
||||
|
||||
// 检查指令是否有副作用
|
||||
bool hasSideEffect(Instruction* inst) const;
|
||||
|
||||
// 检查指令是否可能修改内存
|
||||
bool mayModifyMemory(Instruction* inst) const;
|
||||
|
||||
// 检查指令是否可能修改全局状态
|
||||
bool mayModifyGlobal(Instruction* inst) const;
|
||||
|
||||
// 检查函数是否为纯函数
|
||||
bool isPureFunction(Function* func) const;
|
||||
|
||||
// 获取已知函数的副作用信息
|
||||
const SideEffectInfo* getKnownFunctionSideEffect(const std::string& funcName) const;
|
||||
|
||||
// 初始化已知函数的副作用信息
|
||||
void initializeKnownFunctions();
|
||||
|
||||
private:
|
||||
};
|
||||
|
||||
// 副作用分析遍类
|
||||
class SysYSideEffectAnalysisPass : public AnalysisPass {
|
||||
public:
|
||||
// 静态成员，作为该遍的唯一ID
|
||||
static void* ID;
|
||||
|
||||
SysYSideEffectAnalysisPass() : AnalysisPass("SysYSideEffectAnalysis", Granularity::Function) {}
|
||||
|
||||
// 在函数上运行分析
|
||||
bool runOnFunction(Function* F, AnalysisManager& AM) override;
|
||||
|
||||
// 获取分析结果
|
||||
std::unique_ptr<AnalysisResultBase> getResult() override;
|
||||
|
||||
// Pass 基类中的纯虚函数，必须实现
|
||||
void* getPassID() const override { return &ID; }
|
||||
|
||||
private:
|
||||
// 分析结果
|
||||
std::unique_ptr<SideEffectAnalysisResult> result;
|
||||
|
||||
// 别名分析结果（在整个函数分析过程中重复使用）
|
||||
AliasAnalysisResult* aliasAnalysis = nullptr;
|
||||
|
||||
// 分析单个指令的副作用
|
||||
SideEffectInfo analyzeInstruction(Instruction* inst, AnalysisManager& AM);
|
||||
|
||||
// 分析函数调用指令的副作用
|
||||
SideEffectInfo analyzeCallInstruction(CallInst* call, AnalysisManager& AM);
|
||||
|
||||
// 分析存储指令的副作用
|
||||
SideEffectInfo analyzeStoreInstruction(StoreInst* store, AnalysisManager& AM);
|
||||
|
||||
// 分析内存设置指令的副作用
|
||||
SideEffectInfo analyzeMemsetInstruction(MemsetInst* memset, AnalysisManager& AM);
|
||||
};
|
||||
|
||||
} // namespace sysy
|
||||
@@ -151,17 +151,21 @@ public:
|
||||
}
|
||||
AnalysisPass *analysisPass = static_cast<AnalysisPass *>(basePass.get());
|
||||
|
||||
if(DEBUG){
|
||||
std::cout << "Running Analysis Pass: " << analysisPass->getName() << "\n";
|
||||
}
|
||||
// 根据分析遍的粒度处理
|
||||
switch (analysisPass->getGranularity()) {
|
||||
case Pass::Granularity::Module: {
|
||||
// 检查是否已存在有效结果
|
||||
auto it = moduleCachedResults.find(analysisID);
|
||||
if (it != moduleCachedResults.end()) {
|
||||
if(DEBUG) {
|
||||
std::cout << "Using cached result for Analysis Pass: " << analysisPass->getName() << "\n";
|
||||
}
|
||||
return static_cast<T *>(it->second.get()); // 返回缓存结果
|
||||
}
|
||||
// 只有在实际运行时才打印调试信息
|
||||
if(DEBUG){
|
||||
std::cout << "Running Analysis Pass: " << analysisPass->getName() << "\n";
|
||||
}
|
||||
// 运行模块级分析遍
|
||||
if (!pModuleRef) {
|
||||
std::cerr << "Error: Module reference not set for AnalysisManager to run Module Pass.\n";
|
||||
@@ -183,8 +187,16 @@ public:
|
||||
// 检查是否已存在有效结果
|
||||
auto it = functionCachedResults.find({F, analysisID});
|
||||
if (it != functionCachedResults.end()) {
|
||||
if(DEBUG) {
|
||||
std::cout << "Using cached result for Analysis Pass: " << analysisPass->getName() << " (Function: " << F->getName() << ")\n";
|
||||
}
|
||||
return static_cast<T *>(it->second.get()); // 返回缓存结果
|
||||
}
|
||||
// 只有在实际运行时才打印调试信息
|
||||
if(DEBUG){
|
||||
std::cout << "Running Analysis Pass: " << analysisPass->getName() << "\n";
|
||||
std::cout << "Function: " << F->getName() << "\n";
|
||||
}
|
||||
// 运行函数级分析遍
|
||||
analysisPass->runOnFunction(F, *this);
|
||||
// 获取结果并缓存
|
||||
@@ -202,8 +214,16 @@ public:
|
||||
// 检查是否已存在有效结果
|
||||
auto it = basicBlockCachedResults.find({BB, analysisID});
|
||||
if (it != basicBlockCachedResults.end()) {
|
||||
if(DEBUG) {
|
||||
std::cout << "Using cached result for Analysis Pass: " << analysisPass->getName() << " (BasicBlock: " << BB->getName() << ")\n";
|
||||
}
|
||||
return static_cast<T *>(it->second.get()); // 返回缓存结果
|
||||
}
|
||||
// 只有在实际运行时才打印调试信息
|
||||
if(DEBUG){
|
||||
std::cout << "Running Analysis Pass: " << analysisPass->getName() << "\n";
|
||||
std::cout << "BasicBlock: " << BB->getName() << "\n";
|
||||
}
|
||||
// 运行基本块级分析遍
|
||||
analysisPass->runOnBasicBlock(BB, *this);
|
||||
// 获取结果并缓存
|
||||
|
||||
Reference in New Issue
Block a user