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d8025487f6
This is incorrect to record region boundaries before scheduling, it may change after scheduling. As a result second pass may see less instructions to schedule than it should. Differential Revision: https://reviews.llvm.org/D31434 llvm-svn: 298945
105 lines
3.0 KiB
C++
105 lines
3.0 KiB
C++
//===-- GCNSchedStrategy.h - GCN Scheduler Strategy -*- C++ -*-------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_AMDGPU_GCNSCHEDSTRATEGY_H
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#define LLVM_LIB_TARGET_AMDGPU_GCNSCHEDSTRATEGY_H
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#include "llvm/CodeGen/MachineScheduler.h"
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namespace llvm {
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class SIMachineFunctionInfo;
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class SIRegisterInfo;
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class SISubtarget;
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/// This is a minimal scheduler strategy. The main difference between this
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/// and the GenericScheduler is that GCNSchedStrategy uses different
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/// heuristics to determine excess/critical pressure sets. Its goal is to
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/// maximize kernel occupancy (i.e. maximum number of waves per simd).
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class GCNMaxOccupancySchedStrategy : public GenericScheduler {
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friend class GCNScheduleDAGMILive;
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SUnit *pickNodeBidirectional(bool &IsTopNode);
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void pickNodeFromQueue(SchedBoundary &Zone, const CandPolicy &ZonePolicy,
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const RegPressureTracker &RPTracker,
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SchedCandidate &Cand);
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void initCandidate(SchedCandidate &Cand, SUnit *SU,
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bool AtTop, const RegPressureTracker &RPTracker,
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const SIRegisterInfo *SRI,
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unsigned SGPRPressure, unsigned VGPRPressure);
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unsigned SGPRExcessLimit;
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unsigned VGPRExcessLimit;
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unsigned SGPRCriticalLimit;
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unsigned VGPRCriticalLimit;
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unsigned TargetOccupancy;
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MachineFunction *MF;
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public:
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GCNMaxOccupancySchedStrategy(const MachineSchedContext *C);
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SUnit *pickNode(bool &IsTopNode) override;
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void initialize(ScheduleDAGMI *DAG) override;
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void setTargetOccupancy(unsigned Occ) { TargetOccupancy = Occ; }
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};
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class GCNScheduleDAGMILive : public ScheduleDAGMILive {
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const SISubtarget &ST;
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const SIMachineFunctionInfo &MFI;
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// Occupancy target at the begining of function scheduling cycle.
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unsigned StartingOccupancy;
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// Minimal real occupancy recorder for the function.
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unsigned MinOccupancy;
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// Scheduling stage number.
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unsigned Stage;
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// Vecor of regions recorder for later rescheduling
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SmallVector<std::pair<MachineBasicBlock::iterator,
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MachineBasicBlock::iterator>, 32> Regions;
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// Region live-ins.
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DenseMap<unsigned, LaneBitmask> LiveIns;
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// Number of live-ins to the current region, first SGPR then VGPR.
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std::pair<unsigned, unsigned> LiveInPressure;
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// Collect current region live-ins.
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void discoverLiveIns();
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// Return current region pressure. First value is SGPR number, second is VGPR.
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std::pair<unsigned, unsigned> getRealRegPressure() const;
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public:
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GCNScheduleDAGMILive(MachineSchedContext *C,
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std::unique_ptr<MachineSchedStrategy> S);
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void schedule() override;
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void finalizeSchedule() override;
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};
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} // End namespace llvm
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#endif // GCNSCHEDSTRATEGY_H
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