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annotate include/llvm/Analysis/CodeMetrics.h @ 120:1172e4bd9c6f

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update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
parents 60c9769439b8
children c2174574ed3a
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1 //===- CodeMetrics.h - Code cost measurements -------------------*- C++ -*-===//
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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 various weight measurements for code, helping
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11 // the Inliner and other passes decide whether to duplicate its contents.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #ifndef LLVM_ANALYSIS_CODEMETRICS_H
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16 #define LLVM_ANALYSIS_CODEMETRICS_H
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17
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18 #include "llvm/ADT/DenseMap.h"
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19 #include "llvm/ADT/SmallPtrSet.h"
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20 #include "llvm/IR/CallSite.h"
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21
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22 namespace llvm {
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23 class AssumptionCache;
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24 class BasicBlock;
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25 class Loop;
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26 class Function;
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27 class Instruction;
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28 class DataLayout;
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29 class TargetTransformInfo;
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30 class Value;
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31
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32 /// \brief Check whether a call will lower to something small.
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33 ///
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34 /// This tests checks whether this callsite will lower to something
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35 /// significantly cheaper than a traditional call, often a single
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36 /// instruction. Note that if isInstructionFree(CS.getInstruction()) would
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37 /// return true, so will this function.
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38 bool callIsSmall(ImmutableCallSite CS);
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39
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40 /// \brief Utility to calculate the size and a few similar metrics for a set
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41 /// of basic blocks.
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42 struct CodeMetrics {
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43 /// \brief True if this function contains a call to setjmp or other functions
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44 /// with attribute "returns twice" without having the attribute itself.
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45 bool exposesReturnsTwice = false;
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46
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47 /// \brief True if this function calls itself.
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48 bool isRecursive = false;
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49
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50 /// \brief True if this function cannot be duplicated.
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51 ///
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52 /// True if this function contains one or more indirect branches, or it contains
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53 /// one or more 'noduplicate' instructions.
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54 bool notDuplicatable = false;
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55
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56 /// \brief True if this function contains a call to a convergent function.
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57 bool convergent = false;
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58
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59 /// \brief True if this function calls alloca (in the C sense).
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60 bool usesDynamicAlloca = false;
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61
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62 /// \brief Number of instructions in the analyzed blocks.
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63 unsigned NumInsts = false;
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64
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65 /// \brief Number of analyzed blocks.
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66 unsigned NumBlocks = false;
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67
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68 /// \brief Keeps track of basic block code size estimates.
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69 DenseMap<const BasicBlock *, unsigned> NumBBInsts;
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70
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71 /// \brief Keep track of the number of calls to 'big' functions.
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72 unsigned NumCalls = false;
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73
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74 /// \brief The number of calls to internal functions with a single caller.
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75 ///
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76 /// These are likely targets for future inlining, likely exposed by
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77 /// interleaved devirtualization.
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78 unsigned NumInlineCandidates = 0;
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79
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80 /// \brief How many instructions produce vector values.
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81 ///
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82 /// The inliner is more aggressive with inlining vector kernels.
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83 unsigned NumVectorInsts = 0;
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84
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85 /// \brief How many 'ret' instructions the blocks contain.
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86 unsigned NumRets = 0;
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87
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88 /// \brief Add information about a block to the current state.
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89 void analyzeBasicBlock(const BasicBlock *BB, const TargetTransformInfo &TTI,
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90 const SmallPtrSetImpl<const Value*> &EphValues);
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91
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92 /// \brief Collect a loop's ephemeral values (those used only by an assume
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93 /// or similar intrinsics in the loop).
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94 static void collectEphemeralValues(const Loop *L, AssumptionCache *AC,
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95 SmallPtrSetImpl<const Value *> &EphValues);
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96
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97 /// \brief Collect a functions's ephemeral values (those used only by an
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98 /// assume or similar intrinsics in the function).
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99 static void collectEphemeralValues(const Function *L, AssumptionCache *AC,
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100 SmallPtrSetImpl<const Value *> &EphValues);
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101 };
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102
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103 }
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104
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105 #endif