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//===-- Analysis.h ----------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Analysis output for benchmark results.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_EXEGESIS_ANALYSIS_H
#define LLVM_TOOLS_LLVM_EXEGESIS_ANALYSIS_H
#include "Clustering.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler/MCDisassembler.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
#include <set>
#include <string>
#include <unordered_map>
namespace llvm {
namespace exegesis {
// A helper class to analyze benchmark results for a target.
class Analysis {
public:
Analysis(const llvm::Target &Target,
const InstructionBenchmarkClustering &Clustering);
// Prints a csv of instructions for each cluster.
struct PrintClusters {};
// Find potential errors in the scheduling information given measurements.
struct PrintSchedClassInconsistencies {};
template <typename Pass> llvm::Error run(llvm::raw_ostream &OS) const;
private:
using ClusterId = InstructionBenchmarkClustering::ClusterId;
// An llvm::MCSchedClassDesc augmented with some additional data.
struct ResolvedSchedClass {
ResolvedSchedClass(const llvm::MCSubtargetInfo &STI,
unsigned ResolvedSchedClassId, bool WasVariant);
const unsigned SchedClassId;
const llvm::MCSchedClassDesc *const SCDesc;
const bool WasVariant; // Whether the original class was variant.
const llvm::SmallVector<llvm::MCWriteProcResEntry, 8>
NonRedundantWriteProcRes;
const std::vector<std::pair<uint16_t, float>> IdealizedProcResPressure;
};
// Represents the intersection of a sched class and a cluster.
class SchedClassCluster {
public:
const InstructionBenchmarkClustering::ClusterId &id() const {
return ClusterId;
}
const std::vector<size_t> &getPointIds() const { return PointIds; }
// Return the cluster centroid.
const std::vector<PerInstructionStats> &getRepresentative() const {
return Representative;
}
// Returns true if the cluster representative measurements match that of SC.
bool
measurementsMatch(const llvm::MCSubtargetInfo &STI,
const ResolvedSchedClass &SC,
const InstructionBenchmarkClustering &Clustering) const;
void addPoint(size_t PointId,
const InstructionBenchmarkClustering &Clustering);
private:
InstructionBenchmarkClustering::ClusterId ClusterId;
std::vector<size_t> PointIds;
// Measurement stats for the points in the SchedClassCluster.
std::vector<PerInstructionStats> Representative;
};
void printInstructionRowCsv(size_t PointId, llvm::raw_ostream &OS) const;
void
printSchedClassClustersHtml(const std::vector<SchedClassCluster> &Clusters,
const ResolvedSchedClass &SC,
llvm::raw_ostream &OS) const;
void printSchedClassDescHtml(const ResolvedSchedClass &SC,
llvm::raw_ostream &OS) const;
// A pair of (Sched Class, indices of points that belong to the sched
// class).
struct ResolvedSchedClassAndPoints {
explicit ResolvedSchedClassAndPoints(ResolvedSchedClass &&RSC);
ResolvedSchedClass RSC;
std::vector<size_t> PointIds;
};
// Builds a list of ResolvedSchedClassAndPoints.
std::vector<ResolvedSchedClassAndPoints> makePointsPerSchedClass() const;
template <typename EscapeTag, EscapeTag Tag>
void writeSnippet(llvm::raw_ostream &OS, llvm::ArrayRef<uint8_t> Bytes,
const char *Separator) const;
const InstructionBenchmarkClustering &Clustering_;
llvm::MCObjectFileInfo ObjectFileInfo_;
std::unique_ptr<llvm::MCContext> Context_;
std::unique_ptr<llvm::MCSubtargetInfo> SubtargetInfo_;
std::unique_ptr<llvm::MCInstrInfo> InstrInfo_;
std::unique_ptr<llvm::MCRegisterInfo> RegInfo_;
std::unique_ptr<llvm::MCAsmInfo> AsmInfo_;
std::unique_ptr<llvm::MCInstPrinter> InstPrinter_;
std::unique_ptr<llvm::MCDisassembler> Disasm_;
};
// Computes the idealized ProcRes Unit pressure. This is the expected
// distribution if the CPU scheduler can distribute the load as evenly as
// possible.
std::vector<std::pair<uint16_t, float>> computeIdealizedProcResPressure(
const llvm::MCSchedModel &SM,
llvm::SmallVector<llvm::MCWriteProcResEntry, 8> WPRS);
} // namespace exegesis
} // namespace llvm
#endif // LLVM_TOOLS_LLVM_EXEGESIS_CLUSTERING_H
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