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annotate lib/Transforms/IPO/InlineSimple.cpp @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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1 //===- InlineSimple.cpp - Code to perform simple function inlining --------===//
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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 file implements bottom-up inlining of functions into callees.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Transforms/IPO.h"
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15 #include "llvm/Analysis/AliasAnalysis.h"
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16 #include "llvm/Analysis/AssumptionCache.h"
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17 #include "llvm/Analysis/CallGraph.h"
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18 #include "llvm/Analysis/InlineCost.h"
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19 #include "llvm/IR/CallSite.h"
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20 #include "llvm/IR/CallingConv.h"
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21 #include "llvm/IR/DataLayout.h"
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22 #include "llvm/IR/Instructions.h"
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23 #include "llvm/IR/IntrinsicInst.h"
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24 #include "llvm/IR/Module.h"
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25 #include "llvm/IR/Type.h"
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26 #include "llvm/Transforms/IPO/InlinerPass.h"
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27
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28 using namespace llvm;
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29
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30 #define DEBUG_TYPE "inline"
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31
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32 namespace {
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33
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34 /// \brief Actual inliner pass implementation.
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35 ///
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36 /// The common implementation of the inlining logic is shared between this
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37 /// inliner pass and the always inliner pass. The two passes use different cost
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38 /// analyses to determine when to inline.
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39 class SimpleInliner : public Inliner {
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40 InlineCostAnalysis *ICA;
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41
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42 public:
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43 SimpleInliner() : Inliner(ID), ICA(nullptr) {
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44 initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
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45 }
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47 SimpleInliner(int Threshold)
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48 : Inliner(ID, Threshold, /*InsertLifetime*/ true), ICA(nullptr) {
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49 initializeSimpleInlinerPass(*PassRegistry::getPassRegistry());
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50 }
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51
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52 static char ID; // Pass identification, replacement for typeid
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53
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54 InlineCost getInlineCost(CallSite CS) override {
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55 return ICA->getInlineCost(CS, getInlineThreshold(CS));
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56 }
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57
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58 bool runOnSCC(CallGraphSCC &SCC) override;
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59 void getAnalysisUsage(AnalysisUsage &AU) const override;
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60 };
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61
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62 static int computeThresholdFromOptLevels(unsigned OptLevel,
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63 unsigned SizeOptLevel) {
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64 if (OptLevel > 2)
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65 return 275;
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66 if (SizeOptLevel == 1) // -Os
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67 return 75;
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68 if (SizeOptLevel == 2) // -Oz
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69 return 25;
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70 return 225;
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71 }
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72
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73 } // end anonymous namespace
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74
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75 char SimpleInliner::ID = 0;
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76 INITIALIZE_PASS_BEGIN(SimpleInliner, "inline",
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77 "Function Integration/Inlining", false, false)
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78 INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
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79 INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
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80 INITIALIZE_PASS_DEPENDENCY(CallGraphWrapperPass)
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81 INITIALIZE_PASS_DEPENDENCY(InlineCostAnalysis)
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82 INITIALIZE_PASS_END(SimpleInliner, "inline",
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83 "Function Integration/Inlining", false, false)
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84
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85 Pass *llvm::createFunctionInliningPass() { return new SimpleInliner(); }
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86
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87 Pass *llvm::createFunctionInliningPass(int Threshold) {
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88 return new SimpleInliner(Threshold);
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89 }
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91 Pass *llvm::createFunctionInliningPass(unsigned OptLevel,
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92 unsigned SizeOptLevel) {
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93 return new SimpleInliner(
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94 computeThresholdFromOptLevels(OptLevel, SizeOptLevel));
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95 }
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96
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97 bool SimpleInliner::runOnSCC(CallGraphSCC &SCC) {
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98 ICA = &getAnalysis<InlineCostAnalysis>();
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99 return Inliner::runOnSCC(SCC);
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100 }
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101
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102 void SimpleInliner::getAnalysisUsage(AnalysisUsage &AU) const {
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103 AU.addRequired<InlineCostAnalysis>();
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104 Inliner::getAnalysisUsage(AU);
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105 }