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//===---------------------- EntryStage.h ------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file defines the Entry stage of an instruction pipeline. Its sole
/// purpose in life is to pick instructions in sequence and move them to the
/// next pipeline stage.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_MCA_ENTRY_STAGE_H
#define LLVM_MCA_ENTRY_STAGE_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/MCA/SourceMgr.h"
#include "llvm/MCA/Stages/Stage.h"
namespace llvm {
namespace mca {
class EntryStage final : public Stage {
InstRef CurrentInstruction;
SmallVector<std::unique_ptr<Instruction>, 16> Instructions;
SourceMgr &SM;
unsigned NumRetired;
// Updates the program counter, and sets 'CurrentInstruction'.
void getNextInstruction();
EntryStage(const EntryStage &Other) = delete;
EntryStage &operator=(const EntryStage &Other) = delete;
public:
EntryStage(SourceMgr &SM) : CurrentInstruction(), SM(SM), NumRetired(0) { }
bool isAvailable(const InstRef &IR) const override;
bool hasWorkToComplete() const override;
Error execute(InstRef &IR) override;
Error cycleStart() override;
Error cycleEnd() override;
};
} // namespace mca
} // namespace llvm
#endif // LLVM_MCA_FETCH_STAGE_H
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