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1 //===---------------------------- Context.cpp -------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 /// \file
10 ///
11 /// This file defines a class for holding ownership of various simulated
12 /// hardware units.  A Context also provides a utility routine for constructing
13 /// a default out-of-order pipeline with fetch, dispatch, execute, and retire
14 /// stages).
15 ///
16 //===----------------------------------------------------------------------===//
17 
18 #include "Context.h"
19 #include "DispatchStage.h"
20 #include "ExecuteStage.h"
21 #include "FetchStage.h"
22 #include "RegisterFile.h"
23 #include "RetireControlUnit.h"
24 #include "RetireStage.h"
25 #include "Scheduler.h"
26 
27 namespace mca {
28 
29 using namespace llvm;
30 
31 std::unique_ptr<Pipeline>
createDefaultPipeline(const PipelineOptions & Opts,InstrBuilder & IB,SourceMgr & SrcMgr)32 Context::createDefaultPipeline(const PipelineOptions &Opts, InstrBuilder &IB,
33                                SourceMgr &SrcMgr) {
34   const MCSchedModel &SM = STI.getSchedModel();
35 
36   // Create the hardware units defining the backend.
37   auto RCU = llvm::make_unique<RetireControlUnit>(SM);
38   auto PRF = llvm::make_unique<RegisterFile>(SM, MRI, Opts.RegisterFileSize);
39   auto HWS = llvm::make_unique<Scheduler>(
40       SM, Opts.LoadQueueSize, Opts.StoreQueueSize, Opts.AssumeNoAlias);
41 
42   // Create the pipeline and its stages.
43   auto P = llvm::make_unique<Pipeline>();
44   auto F = llvm::make_unique<FetchStage>(IB, SrcMgr);
45   auto D = llvm::make_unique<DispatchStage>(
46       STI, MRI, Opts.RegisterFileSize, Opts.DispatchWidth, *RCU, *PRF, *HWS);
47   auto R = llvm::make_unique<RetireStage>(*RCU, *PRF);
48   auto E = llvm::make_unique<ExecuteStage>(*RCU, *HWS);
49 
50   // Add the hardware to the context.
51   addHardwareUnit(std::move(RCU));
52   addHardwareUnit(std::move(PRF));
53   addHardwareUnit(std::move(HWS));
54 
55   // Build the pipeline.
56   P->appendStage(std::move(F));
57   P->appendStage(std::move(D));
58   P->appendStage(std::move(R));
59   P->appendStage(std::move(E));
60   return P;
61 }
62 
63 } // namespace mca
64