llvm/tools/llvm-exegesis/lib/Analysis.h

   1 //===-- Analysis.h ----------------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 ///
   9 /// \file
  10 /// Analysis output for benchmark results.
  11 ///
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_TOOLS_LLVM_EXEGESIS_ANALYSIS_H
  15 #define LLVM_TOOLS_LLVM_EXEGESIS_ANALYSIS_H
  16
  17 #include "Clustering.h"
  18 #include "DisassemblerHelper.h"
  19 #include "SchedClassResolution.h"
  20 #include "llvm/MC/MCInstrInfo.h"
  21 #include "llvm/MC/MCObjectFileInfo.h"
  22 #include "llvm/MC/MCSubtargetInfo.h"
  23 #include "llvm/Support/Error.h"
  24 #include "llvm/Support/raw_ostream.h"
  25 #include <memory>
  26
  27 namespace llvm {
  28 namespace exegesis {
  29
  30 // A helper class to analyze benchmark results for a target.
  31 class Analysis {
  32 public:
  33   Analysis(const LLVMState &State,
  34            const BenchmarkClustering &Clustering,
  35            double AnalysisInconsistencyEpsilon,
  36            bool AnalysisDisplayUnstableOpcodes);
  37
  38   // Prints a csv of instructions for each cluster.
  39   struct PrintClusters {};
  40   // Find potential errors in the scheduling information given measurements.
  41   struct PrintSchedClassInconsistencies {};
  42
  43   template <typename Pass> Error run(raw_ostream &OS) const;
  44
  45 private:
  46   using ClusterId = BenchmarkClustering::ClusterId;
  47
  48   // Represents the intersection of a sched class and a cluster.
  49   class SchedClassCluster {
  50   public:
  51     const BenchmarkClustering::ClusterId &id() const {
  52       return ClusterId;
  53     }
  54
  55     const std::vector<size_t> &getPointIds() const { return PointIds; }
  56
  57     void addPoint(size_t PointId,
  58                   const BenchmarkClustering &Clustering);
  59
  60     // Return the cluster centroid.
  61     const SchedClassClusterCentroid &getCentroid() const { return Centroid; }
  62
  63     // Returns true if the cluster representative measurements match that of SC.
  64     bool
  65     measurementsMatch(const MCSubtargetInfo &STI, const ResolvedSchedClass &SC,
  66                       const BenchmarkClustering &Clustering,
  67                       const double AnalysisInconsistencyEpsilonSquared_) const;
  68
  69   private:
  70     BenchmarkClustering::ClusterId ClusterId;
  71     std::vector<size_t> PointIds;
  72     // Measurement stats for the points in the SchedClassCluster.
  73     SchedClassClusterCentroid Centroid;
  74   };
  75
  76   void printInstructionRowCsv(size_t PointId, raw_ostream &OS) const;
  77
  78   void printClusterRawHtml(const BenchmarkClustering::ClusterId &Id,
  79                            StringRef display_name, raw_ostream &OS) const;
  80
  81   void printPointHtml(const Benchmark &Point, raw_ostream &OS) const;
  82
  83   void
  84   printSchedClassClustersHtml(const std::vector<SchedClassCluster> &Clusters,
  85                               const ResolvedSchedClass &SC,
  86                               raw_ostream &OS) const;
  87   void printSchedClassDescHtml(const ResolvedSchedClass &SC,
  88                                raw_ostream &OS) const;
  89
  90   // A pair of (Sched Class, indices of points that belong to the sched
  91   // class).
  92   struct ResolvedSchedClassAndPoints {
  93     explicit ResolvedSchedClassAndPoints(ResolvedSchedClass &&RSC);
  94
  95     ResolvedSchedClass RSC;
  96     std::vector<size_t> PointIds;
  97   };
  98
  99   // Builds a list of ResolvedSchedClassAndPoints.
 100   std::vector<ResolvedSchedClassAndPoints> makePointsPerSchedClass() const;
 101
 102   template <typename EscapeTag, EscapeTag Tag>
 103   void writeSnippet(raw_ostream &OS, ArrayRef<uint8_t> Bytes,
 104                     const char *Separator) const;
 105
 106   const BenchmarkClustering &Clustering_;
 107   const LLVMState &State_;
 108   std::unique_ptr<DisassemblerHelper> DisasmHelper_;
 109   const double AnalysisInconsistencyEpsilonSquared_;
 110   const bool AnalysisDisplayUnstableOpcodes_;
 111 };
 112
 113 } // namespace exegesis
 114 } // namespace llvm
 115
 116 #endif // LLVM_TOOLS_LLVM_EXEGESIS_CLUSTERING_H