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//===-- GCNSchedStrategy.h - GCN Scheduler Strategy -*- C++ -*-------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AMDGPU_GCNSCHEDSTRATEGY_H
#define LLVM_LIB_TARGET_AMDGPU_GCNSCHEDSTRATEGY_H
#include "llvm/CodeGen/MachineScheduler.h"
namespace llvm {
class SIRegisterInfo;
/// This is a minimal scheduler strategy. The main difference between this
/// and the GenericScheduler is that GCNSchedStrategy uses different
/// heuristics to determine excess/critical pressure sets. Its goal is to
/// maximize kernel occupancy (i.e. maximum number of waves per simd).
class GCNMaxOccupancySchedStrategy : public GenericScheduler {
friend class GCNScheduleDAGMILive;
SUnit *pickNodeBidirectional(bool &IsTopNode);
void pickNodeFromQueue(SchedBoundary &Zone, const CandPolicy &ZonePolicy,
const RegPressureTracker &RPTracker,
SchedCandidate &Cand);
void initCandidate(SchedCandidate &Cand, SUnit *SU,
bool AtTop, const RegPressureTracker &RPTracker,
const SIRegisterInfo *SRI,
unsigned SGPRPressure, unsigned VGPRPressure);
unsigned SGPRExcessLimit;
unsigned VGPRExcessLimit;
unsigned SGPRCriticalLimit;
unsigned VGPRCriticalLimit;
public:
GCNMaxOccupancySchedStrategy(const MachineSchedContext *C);
SUnit *pickNode(bool &IsTopNode) override;
void initialize(ScheduleDAGMI *DAG) override;
};
class GCNScheduleDAGMILive : public ScheduleDAGMILive {
public:
GCNScheduleDAGMILive(MachineSchedContext *C,
std::unique_ptr<MachineSchedStrategy> S) :
ScheduleDAGMILive(C, std::move(S)) {}
void schedule() override;
};
} // End namespace llvm
#endif // GCNSCHEDSTRATEGY_H
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