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annotate lib/CodeGen/TailDuplication.cpp @ 120:1172e4bd9c6f

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update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
parents 7d135dc70f03
children 803732b1fca8
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1 //===-- TailDuplication.cpp - Duplicate blocks into predecessors' tails ---===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This pass duplicates basic blocks ending in unconditional branches into
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11 // the tails of their predecessors, using the TailDuplicator utility class.
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12 //
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13 //===----------------------------------------------------------------------===//
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15 #include "llvm/CodeGen/MachineFunctionPass.h"
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16 #include "llvm/CodeGen/Passes.h"
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17 #include "llvm/CodeGen/TailDuplicator.h"
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18 #include "llvm/IR/Function.h"
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19 #include "llvm/Support/Debug.h"
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20 using namespace llvm;
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21
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22 #define DEBUG_TYPE "tailduplication"
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24 namespace {
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25 /// Perform tail duplication. Delegates to TailDuplicator
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26 class TailDuplicatePass : public MachineFunctionPass {
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27 TailDuplicator Duplicator;
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28
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29 public:
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30 static char ID;
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31 explicit TailDuplicatePass() : MachineFunctionPass(ID) {}
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33 bool runOnMachineFunction(MachineFunction &MF) override;
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34
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35 void getAnalysisUsage(AnalysisUsage &AU) const override;
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36 };
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38 char TailDuplicatePass::ID = 0;
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39 }
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41 char &llvm::TailDuplicateID = TailDuplicatePass::ID;
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42
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43 INITIALIZE_PASS(TailDuplicatePass, "tailduplication", "Tail Duplication", false,
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44 false)
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46 bool TailDuplicatePass::runOnMachineFunction(MachineFunction &MF) {
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47 if (skipFunction(*MF.getFunction()))
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48 return false;
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50 auto MBPI = &getAnalysis<MachineBranchProbabilityInfo>();
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52 Duplicator.initMF(MF, MBPI, /* LayoutMode */ false);
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54 bool MadeChange = false;
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55 while (Duplicator.tailDuplicateBlocks())
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56 MadeChange = true;
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58 return MadeChange;
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59 }
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61 void TailDuplicatePass::getAnalysisUsage(AnalysisUsage &AU) const {
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62 AU.addRequired<MachineBranchProbabilityInfo>();
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63 MachineFunctionPass::getAnalysisUsage(AU);
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64 }