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//===-- SnippetGenerator.h --------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Defines the abstract SnippetGenerator class for generating code that allows
/// measuring a certain property of instructions (e.g. latency).
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_LLVM_EXEGESIS_SNIPPETGENERATOR_H
#define LLVM_TOOLS_LLVM_EXEGESIS_SNIPPETGENERATOR_H
#include "Assembler.h"
#include "BenchmarkCode.h"
#include "CodeTemplate.h"
#include "LlvmState.h"
#include "MCInstrDescView.h"
#include "RegisterAliasing.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Support/Error.h"
#include <cstdlib>
#include <memory>
#include <vector>
namespace exegesis {
// A class representing failures that happened during Benchmark, they are used
// to report informations to the user.
class SnippetGeneratorFailure : public llvm::StringError {
public:
SnippetGeneratorFailure(const llvm::Twine &S);
};
// Common code for all benchmark modes.
class SnippetGenerator {
public:
explicit SnippetGenerator(const LLVMState &State);
virtual ~SnippetGenerator();
// Calls generateCodeTemplate and expands it into one or more BenchmarkCode.
llvm::Expected<std::vector<BenchmarkCode>>
generateConfigurations(unsigned Opcode) const;
// Given a snippet, computes which registers the setup code needs to define.
std::vector<RegisterValue> computeRegisterInitialValues(
const std::vector<InstructionBuilder> &Snippet) const;
protected:
const LLVMState &State;
const RegisterAliasingTrackerCache RATC;
// Generates a single code template that has a self-dependency.
llvm::Expected<CodeTemplate>
generateSelfAliasingCodeTemplate(const Instruction &Instr) const;
// Generates a single code template without assignment constraints.
llvm::Expected<CodeTemplate>
generateUnconstrainedCodeTemplate(const Instruction &Instr,
llvm::StringRef Msg) const;
private:
// API to be implemented by subclasses.
virtual llvm::Expected<CodeTemplate>
generateCodeTemplate(unsigned Opcode) const = 0;
};
} // namespace exegesis
#endif // LLVM_TOOLS_LLVM_EXEGESIS_SNIPPETGENERATOR_H
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