LLVM  7.0.0svn
ProfileSummaryInfo.h
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1 //===- llvm/Analysis/ProfileSummaryInfo.h - profile summary ---*- C++ -*-===//
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 a pass that provides access to profile summary
11 // information.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_ANALYSIS_PROFILE_SUMMARY_INFO_H
16 #define LLVM_ANALYSIS_PROFILE_SUMMARY_INFO_H
17 
18 #include "llvm/ADT/ArrayRef.h"
19 #include "llvm/ADT/DenseMap.h"
20 #include "llvm/ADT/SmallSet.h"
21 #include "llvm/IR/Function.h"
22 #include "llvm/IR/Instructions.h"
23 #include "llvm/IR/PassManager.h"
24 #include "llvm/IR/ProfileSummary.h"
25 #include "llvm/IR/ValueHandle.h"
26 #include "llvm/Pass.h"
27 #include <memory>
28 
29 namespace llvm {
30 class BasicBlock;
31 class BlockFrequencyInfo;
32 class CallSite;
33 class ProfileSummary;
34 /// Analysis providing profile information.
35 ///
36 /// This is an immutable analysis pass that provides ability to query global
37 /// (program-level) profile information. The main APIs are isHotCount and
38 /// isColdCount that tells whether a given profile count is considered hot/cold
39 /// based on the profile summary. This also provides convenience methods to
40 /// check whether a function is hot or cold.
41 
42 // FIXME: Provide convenience methods to determine hotness/coldness of other IR
43 // units. This would require making this depend on BFI.
45 private:
46  Module &M;
47  std::unique_ptr<ProfileSummary> Summary;
48  bool computeSummary();
49  void computeThresholds();
50  // Count thresholds to answer isHotCount and isColdCount queries.
51  Optional<uint64_t> HotCountThreshold, ColdCountThreshold;
52  // True if the working set size of the code is considered huge,
53  // because the number of profile counts required to reach the hot
54  // percentile is above a huge threshold.
55  Optional<bool> HasHugeWorkingSetSize;
56 
57 public:
58  ProfileSummaryInfo(Module &M) : M(M) {}
60  : M(Arg.M), Summary(std::move(Arg.Summary)) {}
61 
62  /// Returns true if profile summary is available.
63  bool hasProfileSummary() { return computeSummary(); }
64 
65  /// Returns true if module \c M has sample profile.
67  return hasProfileSummary() &&
68  Summary->getKind() == ProfileSummary::PSK_Sample;
69  }
70 
71  /// Returns true if module \c M has instrumentation profile.
73  return hasProfileSummary() &&
74  Summary->getKind() == ProfileSummary::PSK_Instr;
75  }
76 
77  /// Handle the invalidation of this information.
78  ///
79  /// When used as a result of \c ProfileSummaryAnalysis this method will be
80  /// called when the module this was computed for changes. Since profile
81  /// summary is immutable after it is annotated on the module, we return false
82  /// here.
85  return false;
86  }
87 
88  /// Returns the profile count for \p CallInst.
91  /// Returns true if the working set size of the code is considered huge.
92  bool hasHugeWorkingSetSize();
93  /// Returns true if \p F has hot function entry.
94  bool isFunctionEntryHot(const Function *F);
95  /// Returns true if \p F contains hot code.
97  /// Returns true if \p F has cold function entry.
98  bool isFunctionEntryCold(const Function *F);
99  /// Returns true if \p F contains only cold code.
101  /// Returns true if \p F is a hot function.
102  bool isHotCount(uint64_t C);
103  /// Returns true if count \p C is considered cold.
104  bool isColdCount(uint64_t C);
105  /// Returns true if BasicBlock \p B is considered hot.
106  bool isHotBB(const BasicBlock *B, BlockFrequencyInfo *BFI);
107  /// Returns true if BasicBlock \p B is considered cold.
108  bool isColdBB(const BasicBlock *B, BlockFrequencyInfo *BFI);
109  /// Returns true if CallSite \p CS is considered hot.
110  bool isHotCallSite(const CallSite &CS, BlockFrequencyInfo *BFI);
111  /// Returns true if Callsite \p CS is considered cold.
112  bool isColdCallSite(const CallSite &CS, BlockFrequencyInfo *BFI);
113  /// Returns HotCountThreshold if set. Recompute HotCountThreshold
114  /// if not set.
115  uint64_t getOrCompHotCountThreshold();
116  /// Returns ColdCountThreshold if set. Recompute HotCountThreshold
117  /// if not set.
118  uint64_t getOrCompColdCountThreshold();
119  /// Returns HotCountThreshold if set.
120  uint64_t getHotCountThreshold() {
121  return HotCountThreshold ? HotCountThreshold.getValue() : 0;
122  }
123  /// Returns ColdCountThreshold if set.
125  return ColdCountThreshold ? ColdCountThreshold.getValue() : 0;
126  }
127 };
128 
129 /// An analysis pass based on legacy pass manager to deliver ProfileSummaryInfo.
131  std::unique_ptr<ProfileSummaryInfo> PSI;
132 
133 public:
134  static char ID;
136 
138  return &*PSI;
139  }
140 
141  bool doInitialization(Module &M) override;
142  bool doFinalization(Module &M) override;
143  void getAnalysisUsage(AnalysisUsage &AU) const override {
144  AU.setPreservesAll();
145  }
146 };
147 
148 /// An analysis pass based on the new PM to deliver ProfileSummaryInfo.
150  : public AnalysisInfoMixin<ProfileSummaryAnalysis> {
151 public:
153 
154  Result run(Module &M, ModuleAnalysisManager &);
155 
156 private:
158  static AnalysisKey Key;
159 };
160 
161 /// Printer pass that uses \c ProfileSummaryAnalysis.
163  : public PassInfoMixin<ProfileSummaryPrinterPass> {
164  raw_ostream &OS;
165 
166 public:
167  explicit ProfileSummaryPrinterPass(raw_ostream &OS) : OS(OS) {}
169 };
170 
171 } // end namespace llvm
172 
173 #endif
uint64_t CallInst * C
bool hasInstrumentationProfile()
Returns true if module M has instrumentation profile.
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
Various leaf nodes.
Definition: ISDOpcodes.h:60
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:63
bool isColdBB(const BasicBlock *B, BlockFrequencyInfo *BFI)
Returns true if BasicBlock B is considered cold.
uint64_t getHotCountThreshold()
Returns HotCountThreshold if set.
bool isColdCount(uint64_t C)
Returns true if count C is considered cold.
Analysis providing profile information.
bool invalidate(Module &, const PreservedAnalyses &, ModuleAnalysisManager::Invalidator &)
Handle the invalidation of this information.
This class represents a function call, abstracting a target machine&#39;s calling convention.
Optional< uint64_t > getProfileCount(const Instruction *CallInst, BlockFrequencyInfo *BFI)
Returns the profile count for CallInst.
F(f)
uint64_t getOrCompHotCountThreshold()
Returns HotCountThreshold if set.
bool isHotCount(uint64_t C)
Returns true if F is a hot function.
bool isFunctionEntryCold(const Function *F)
Returns true if F has cold function entry.
bool isHotCallSite(const CallSite &CS, BlockFrequencyInfo *BFI)
Returns true if CallSite CS is considered hot.
uint64_t getOrCompColdCountThreshold()
Returns ColdCountThreshold if set.
bool isFunctionHotInCallGraph(const Function *F, BlockFrequencyInfo &BFI)
Returns true if F contains hot code.
Definition: BitVector.h:921
An analysis pass based on legacy pass manager to deliver ProfileSummaryInfo.
bool isHotBB(const BasicBlock *B, BlockFrequencyInfo *BFI)
Returns true if BasicBlock B is considered hot.
Key
PAL metadata keys.
const T & getValue() const LLVM_LVALUE_FUNCTION
Definition: Optional.h:179
A CRTP mix-in to automatically provide informational APIs needed for passes.
Definition: PassManager.h:365
bool hasProfileSummary()
Returns true if profile summary is available.
BlockFrequencyInfo pass uses BlockFrequencyInfoImpl implementation to estimate IR basic block frequen...
static GCRegistry::Add< OcamlGC > B("ocaml", "ocaml 3.10-compatible GC")
A set of analyses that are preserved following a run of a transformation pass.
Definition: PassManager.h:153
LLVM Basic Block Representation.
Definition: BasicBlock.h:59
bool hasSampleProfile()
Returns true if module M has sample profile.
An analysis pass based on the new PM to deliver ProfileSummaryInfo.
A CRTP mix-in that provides informational APIs needed for analysis passes.
Definition: PassManager.h:382
Represent the analysis usage information of a pass.
ImmutablePass class - This class is used to provide information that does not need to be run...
Definition: Pass.h:256
uint64_t getColdCountThreshold()
Returns ColdCountThreshold if set.
bool isFunctionColdInCallGraph(const Function *F, BlockFrequencyInfo &BFI)
Returns true if F contains only cold code.
void setPreservesAll()
Set by analyses that do not transform their input at all.
ProfileSummaryInfo(ProfileSummaryInfo &&Arg)
amdgpu Simplify well known AMD library false Value Value * Arg
Printer pass that uses ProfileSummaryAnalysis.
bool isFunctionEntryHot(const Function *F)
Returns true if F has hot function entry.
API to communicate dependencies between analyses during invalidation.
Definition: PassManager.h:559
bool isColdCallSite(const CallSite &CS, BlockFrequencyInfo *BFI)
Returns true if Callsite CS is considered cold.
bool hasHugeWorkingSetSize()
Returns true if the working set size of the code is considered huge.
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
A container for analyses that lazily runs them and caches their results.
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - This function should be overriden by passes that need analysis information to do t...
This header defines various interfaces for pass management in LLVM.
A special type used by analysis passes to provide an address that identifies that particular analysis...
Definition: PassManager.h:70