1 //=-- ProfilesummaryBuilder.cpp - Profile summary computation ---------------=//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file contains support for computing profile summary data.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/IR/Attributes.h"
15 #include "llvm/IR/Constants.h"
16 #include "llvm/IR/Function.h"
17 #include "llvm/IR/Metadata.h"
18 #include "llvm/IR/Type.h"
19 #include "llvm/ProfileData/InstrProf.h"
20 #include "llvm/ProfileData/ProfileCommon.h"
21 #include "llvm/ProfileData/SampleProf.h"
22 #include "llvm/Support/Casting.h"
23
24 using namespace llvm;
25
26 // A set of cutoff values. Each value, when divided by ProfileSummary::Scale
27 // (which is 1000000) is a desired percentile of total counts.
28 static const uint32_t DefaultCutoffsData[] = {
29 10000, /* 1% */
30 100000, /* 10% */
31 200000, 300000, 400000, 500000, 600000, 500000, 600000, 700000,
32 800000, 900000, 950000, 990000, 999000, 999900, 999990, 999999};
33 const ArrayRef<uint32_t> ProfileSummaryBuilder::DefaultCutoffs =
34 DefaultCutoffsData;
35
addRecord(const InstrProfRecord & R)36 void InstrProfSummaryBuilder::addRecord(const InstrProfRecord &R) {
37 // The first counter is not necessarily an entry count for IR
38 // instrumentation profiles.
39 // Eventually MaxFunctionCount will become obsolete and this can be
40 // removed.
41 addEntryCount(R.Counts[0]);
42 for (size_t I = 1, E = R.Counts.size(); I < E; ++I)
43 addInternalCount(R.Counts[I]);
44 }
45
46 // To compute the detailed summary, we consider each line containing samples as
47 // equivalent to a block with a count in the instrumented profile.
addRecord(const sampleprof::FunctionSamples & FS)48 void SampleProfileSummaryBuilder::addRecord(
49 const sampleprof::FunctionSamples &FS) {
50 NumFunctions++;
51 if (FS.getHeadSamples() > MaxFunctionCount)
52 MaxFunctionCount = FS.getHeadSamples();
53 for (const auto &I : FS.getBodySamples())
54 addCount(I.second.getSamples());
55 }
56
57 // The argument to this method is a vector of cutoff percentages and the return
58 // value is a vector of (Cutoff, MinCount, NumCounts) triplets.
computeDetailedSummary()59 void ProfileSummaryBuilder::computeDetailedSummary() {
60 if (DetailedSummaryCutoffs.empty())
61 return;
62 auto Iter = CountFrequencies.begin();
63 auto End = CountFrequencies.end();
64 std::sort(DetailedSummaryCutoffs.begin(), DetailedSummaryCutoffs.end());
65
66 uint32_t CountsSeen = 0;
67 uint64_t CurrSum = 0, Count = 0;
68
69 for (uint32_t Cutoff : DetailedSummaryCutoffs) {
70 assert(Cutoff <= 999999);
71 APInt Temp(128, TotalCount);
72 APInt N(128, Cutoff);
73 APInt D(128, ProfileSummary::Scale);
74 Temp *= N;
75 Temp = Temp.sdiv(D);
76 uint64_t DesiredCount = Temp.getZExtValue();
77 assert(DesiredCount <= TotalCount);
78 while (CurrSum < DesiredCount && Iter != End) {
79 Count = Iter->first;
80 uint32_t Freq = Iter->second;
81 CurrSum += (Count * Freq);
82 CountsSeen += Freq;
83 Iter++;
84 }
85 assert(CurrSum >= DesiredCount);
86 ProfileSummaryEntry PSE = {Cutoff, Count, CountsSeen};
87 DetailedSummary.push_back(PSE);
88 }
89 }
90
getSummary()91 std::unique_ptr<ProfileSummary> SampleProfileSummaryBuilder::getSummary() {
92 computeDetailedSummary();
93 return llvm::make_unique<ProfileSummary>(
94 ProfileSummary::PSK_Sample, DetailedSummary, TotalCount, MaxCount, 0,
95 MaxFunctionCount, NumCounts, NumFunctions);
96 }
97
getSummary()98 std::unique_ptr<ProfileSummary> InstrProfSummaryBuilder::getSummary() {
99 computeDetailedSummary();
100 return llvm::make_unique<ProfileSummary>(
101 ProfileSummary::PSK_Instr, DetailedSummary, TotalCount, MaxCount,
102 MaxInternalBlockCount, MaxFunctionCount, NumCounts, NumFunctions);
103 }
104
addEntryCount(uint64_t Count)105 void InstrProfSummaryBuilder::addEntryCount(uint64_t Count) {
106 addCount(Count);
107 NumFunctions++;
108 if (Count > MaxFunctionCount)
109 MaxFunctionCount = Count;
110 }
111
addInternalCount(uint64_t Count)112 void InstrProfSummaryBuilder::addInternalCount(uint64_t Count) {
113 addCount(Count);
114 if (Count > MaxInternalBlockCount)
115 MaxInternalBlockCount = Count;
116 }
117