| //===---------------------- FetchStage.cpp ----------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| /// \file |
| /// |
| /// This file defines the Fetch stage of an instruction pipeline. Its sole |
| /// purpose in life is to produce instructions for the rest of the pipeline. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "FetchStage.h" |
| |
| namespace mca { |
| |
| bool FetchStage::hasWorkToComplete() const { return SM.hasNext(); } |
| |
| bool FetchStage::execute(InstRef &IR) { |
| if (!SM.hasNext()) |
| return false; |
| const SourceRef SR = SM.peekNext(); |
| std::unique_ptr<Instruction> I = IB.createInstruction(*SR.second); |
| IR = InstRef(SR.first, I.get()); |
| Instructions[IR.getSourceIndex()] = std::move(I); |
| return true; |
| } |
| |
| void FetchStage::postExecute() { SM.updateNext(); } |
| |
| void FetchStage::cycleEnd() { |
| // Find the first instruction which hasn't been retired. |
| const InstMap::iterator It = |
| llvm::find_if(Instructions, [](const InstMap::value_type &KeyValuePair) { |
| return !KeyValuePair.second->isRetired(); |
| }); |
| |
| // Erase instructions up to the first that hasn't been retired. |
| if (It != Instructions.begin()) |
| Instructions.erase(Instructions.begin(), It); |
| } |
| |
| } // namespace mca |
