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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73156 91177308-0d34-0410-b5e6-96231b3b80d8
64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
//===- LazyLiveness.h - Lazy, CFG-invariant liveness information ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass implements a lazy liveness analysis as per "Fast Liveness Checking
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// for SSA-form Programs," by Boissinot, et al.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_LAZYLIVENESS_H
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#define LLVM_CODEGEN_LAZYLIVENESS_H
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineDominators.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/DenseSet.h"
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#include "llvm/ADT/SparseBitVector.h"
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#include <vector>
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namespace llvm {
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class MachineRegisterInfo;
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class LazyLiveness : public MachineFunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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LazyLiveness() : MachineFunctionPass(&ID) { }
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void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<MachineDominatorTree>();
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}
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bool runOnMachineFunction(MachineFunction &mf);
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bool vregLiveIntoMBB(unsigned vreg, MachineBasicBlock* MBB);
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private:
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void computeBackedgeChain(MachineFunction& mf, MachineBasicBlock* MBB);
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typedef std::pair<MachineBasicBlock*, MachineBasicBlock*> edge_t;
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MachineRegisterInfo* MRI;
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DenseMap<MachineBasicBlock*, unsigned> preorder;
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std::vector<MachineBasicBlock*> rev_preorder;
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DenseMap<MachineBasicBlock*, SparseBitVector<128> > rv;
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DenseMap<MachineBasicBlock*, SparseBitVector<128> > tv;
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DenseSet<edge_t> backedges;
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SparseBitVector<128> backedge_source;
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SparseBitVector<128> backedge_target;
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SparseBitVector<128> calculated;
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};
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}
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#endif
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