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//===- HexagonMachineScheduler.cpp - MI Scheduler for Hexagon -------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// MachineScheduler schedules machine instructions after phi elimination. It
// preserves LiveIntervals so it can be invoked before register allocation.
//
//===----------------------------------------------------------------------===//
#include "HexagonMachineScheduler.h"
#include "HexagonInstrInfo.h"
#include "HexagonSubtarget.h"
#include "llvm/CodeGen/MachineScheduler.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/CodeGen/VLIWMachineScheduler.h"
using namespace llvm;
#define DEBUG_TYPE "machine-scheduler"
/// Return true if there is a dependence between SUd and SUu.
bool HexagonVLIWResourceModel::hasDependence(const SUnit *SUd,
const SUnit *SUu) {
const auto *QII = static_cast<const HexagonInstrInfo *>(TII);
// Enable .cur formation.
if (QII->mayBeCurLoad(*SUd->getInstr()))
return false;
if (QII->canExecuteInBundle(*SUd->getInstr(), *SUu->getInstr()))
return false;
return VLIWResourceModel::hasDependence(SUd, SUu);
}
VLIWResourceModel *HexagonConvergingVLIWScheduler::createVLIWResourceModel(
const TargetSubtargetInfo &STI, const TargetSchedModel *SchedModel) const {
return new HexagonVLIWResourceModel(STI, SchedModel);
}
int HexagonConvergingVLIWScheduler::SchedulingCost(ReadyQueue &Q, SUnit *SU,
SchedCandidate &Candidate,
RegPressureDelta &Delta,
bool verbose) {
int ResCount =
ConvergingVLIWScheduler::SchedulingCost(Q, SU, Candidate, Delta, verbose);
if (!SU || SU->isScheduled)
return ResCount;
auto &QST = DAG->MF.getSubtarget<HexagonSubtarget>();
auto &QII = *QST.getInstrInfo();
if (SU->isInstr() && QII.mayBeCurLoad(*SU->getInstr())) {
if (Q.getID() == TopQID &&
Top.ResourceModel->isResourceAvailable(SU, true)) {
ResCount += PriorityTwo;
LLVM_DEBUG(if (verbose) dbgs() << "C|");
} else if (Q.getID() == BotQID &&
Bot.ResourceModel->isResourceAvailable(SU, false)) {
ResCount += PriorityTwo;
LLVM_DEBUG(if (verbose) dbgs() << "C|");
}
}
return ResCount;
}
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