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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
//===--------------------- Pipeline.cpp -------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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///
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/// This file implements an ordered container of stages that simulate the
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/// pipeline of a hardware backend.
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///
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//===----------------------------------------------------------------------===//
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#include "llvm/MCA/Pipeline.h"
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#include "llvm/MCA/HWEventListener.h"
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#include "llvm/Support/Debug.h"
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namespace llvm {
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namespace mca {
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#define DEBUG_TYPE "llvm-mca"
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void Pipeline::addEventListener(HWEventListener *Listener) {
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if (Listener)
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Listeners.insert(Listener);
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for (auto &S : Stages)
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S->addListener(Listener);
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}
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bool Pipeline::hasWorkToProcess() {
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return any_of(Stages, [](const std::unique_ptr<Stage> &S) {
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return S->hasWorkToComplete();
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});
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}
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Expected<unsigned> Pipeline::run() {
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assert(!Stages.empty() && "Unexpected empty pipeline found!");
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do {
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notifyCycleBegin();
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if (Error Err = runCycle())
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return std::move(Err);
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notifyCycleEnd();
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++Cycles;
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} while (hasWorkToProcess());
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return Cycles;
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}
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Error Pipeline::runCycle() {
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Error Err = ErrorSuccess();
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// Update stages before we start processing new instructions.
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for (auto I = Stages.rbegin(), E = Stages.rend(); I != E && !Err; ++I) {
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const std::unique_ptr<Stage> &S = *I;
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Err = S->cycleStart();
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}
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// Now fetch and execute new instructions.
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InstRef IR;
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Stage &FirstStage = *Stages[0];
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while (!Err && FirstStage.isAvailable(IR))
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Err = FirstStage.execute(IR);
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// Update stages in preparation for a new cycle.
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for (auto I = Stages.rbegin(), E = Stages.rend(); I != E && !Err; ++I) {
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const std::unique_ptr<Stage> &S = *I;
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Err = S->cycleEnd();
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}
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return Err;
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}
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void Pipeline::appendStage(std::unique_ptr<Stage> S) {
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assert(S && "Invalid null stage in input!");
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if (!Stages.empty()) {
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Stage *Last = Stages.back().get();
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Last->setNextInSequence(S.get());
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}
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Stages.push_back(std::move(S));
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}
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void Pipeline::notifyCycleBegin() {
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LLVM_DEBUG(dbgs() << "\n[E] Cycle begin: " << Cycles << '\n');
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for (HWEventListener *Listener : Listeners)
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Listener->onCycleBegin();
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}
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void Pipeline::notifyCycleEnd() {
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LLVM_DEBUG(dbgs() << "[E] Cycle end: " << Cycles << "\n");
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for (HWEventListener *Listener : Listeners)
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Listener->onCycleEnd();
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}
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} // namespace mca.
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} // namespace llvm
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