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78e02f78ce
alias analysis, adding caching and lazy computation of queries. This will be used in planned improvements to memory access optimizations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37958 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
//===- llvm/Analysis/MemoryDependenceAnalysis.h - Memory Deps --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the Owen Anderson and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an analysis that determines, for a given memory operation,
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// what preceding memory operations it depends on. It builds on alias analysis
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// information, and tries to provide a lazy, caching interface to a common kind
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// of alias information query.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_MEMORY_DEPENDENCE_H
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#define LLVM_ANALYSIS_MEMORY_DEPENDENCE_H
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#include "llvm/Pass.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/Compiler.h"
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#include <map>
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namespace llvm {
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class Function;
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class FunctionPass;
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class Instruction;
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class VISIBILITY_HIDDEN MemoryDependenceAnalysis : public FunctionPass {
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private:
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DenseMap<Instruction*, std::pair<Instruction*, bool> > depGraphLocal;
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std::multimap<Instruction*, Instruction*> reverseDep;
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public:
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static Instruction* NonLocal;
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static Instruction* None;
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static char ID; // Class identification, replacement for typeinfo
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MemoryDependenceAnalysis() : FunctionPass((intptr_t)&ID) {}
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/// Pass Implementation stuff. This doesn't do any analysis.
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///
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bool runOnFunction(Function &) {
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depGraphLocal.clear();
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reverseDep.clear();
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return false;
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}
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/// getAnalysisUsage - Does not modify anything. It uses Value Numbering
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/// and Alias Analysis.
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///
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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/// getDependency - Return the instruction on which a memory operation
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/// depends.
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Instruction* getDependency(Instruction* query, bool local = true);
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/// removeInstruction - Remove an instruction from the dependence analysis,
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/// updating the dependence of instructions that previously depended on it.
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void removeInstruction(Instruction* rem);
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};
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} // End llvm namespace
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#endif
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