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//===-- DependenceAnalyzer.h - Dependence Analyzer--------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DEPENDENCEANALYZER_H
#define LLVM_DEPENDENCEANALYZER_H
#include "llvm/Instructions.h"
#include "llvm/Function.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/Target/TargetData.h"
#include <vector>
namespace llvm {
//class to represent a dependence
struct Dependence {
enum DataDepType {
TrueDep, AntiDep, OutputDep, NonDateDep,
};
Dependence(int diff, DataDepType dep) : iteDiff(diff), depType(dep) {}
unsigned getIteDiff() { return iteDiff; }
unsigned getDepType() { return depType; }
private:
unsigned iteDiff;
unsigned depType;
};
struct DependenceResult {
std::vector<Dependence> dependences;
DependenceResult(const std::vector<Dependence> &d) : dependences(d) {}
};
class DependenceAnalyzer : public FunctionPass {
AliasAnalysis *AA;
TargetData *TD;
ScalarEvolution *SE;
void advancedDepAnalysis(GetElementPtrInst *gp1, GetElementPtrInst *gp2,
bool valLoad, bool val2Load,
std::vector<Dependence> &deps, bool srcBeforeDest);
void AnalyzeDeps(Value *val, Value *val2, bool val1Load, bool val2Load,
std::vector<Dependence> &deps, BasicBlock *BB,
bool srcBeforeDest);
void createDep(std::vector<Dependence> &deps, bool valLoad, bool val2Load,
bool srcBeforeDest, int diff = 0);
public:
DependenceAnalyzer() { AA = 0; TD = 0; SE = 0; }
virtual bool runOnFunction(Function &F);
virtual const char* getPassName() const { return "DependenceAnalyzer"; }
// getAnalysisUsage
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<AliasAnalysis>();
AU.addRequired<TargetData>();
AU.addRequired<ScalarEvolution>();
AU.setPreservesAll();
}
//get dependence info
DependenceResult getDependenceInfo(Instruction *inst1, Instruction *inst2,
bool srcBeforeDest);
};
}
#endif
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