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LLVM
4.0.0
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This is a minimal scheduler strategy. More...
#include <GCNSchedStrategy.h>
Public Member Functions | |
| GCNMaxOccupancySchedStrategy (const MachineSchedContext *C) | |
| SUnit * | pickNode (bool &IsTopNode) override |
| Pick the best node to balance the schedule. Implements MachineSchedStrategy. More... | |
Public Member Functions inherited from llvm::GenericScheduler | |
| GenericScheduler (const MachineSchedContext *C) | |
| void | initPolicy (MachineBasicBlock::iterator Begin, MachineBasicBlock::iterator End, unsigned NumRegionInstrs) override |
| Initialize the per-region scheduling policy. More... | |
| void | dumpPolicy () override |
| bool | shouldTrackPressure () const override |
| Check if pressure tracking is needed before building the DAG and initializing this strategy. More... | |
| bool | shouldTrackLaneMasks () const override |
| Returns true if lanemasks should be tracked. More... | |
| void | initialize (ScheduleDAGMI *dag) override |
| Initialize the strategy after building the DAG for a new region. More... | |
| void | schedNode (SUnit *SU, bool IsTopNode) override |
| Update the scheduler's state after scheduling a node. More... | |
| void | releaseTopNode (SUnit *SU) override |
| When all predecessor dependencies have been resolved, free this node for top-down scheduling. More... | |
| void | releaseBottomNode (SUnit *SU) override |
| When all successor dependencies have been resolved, free this node for bottom-up scheduling. More... | |
| void | registerRoots () override |
| Notify this strategy that all roots have been released (including those that depend on EntrySU or ExitSU). More... | |
Public Member Functions inherited from llvm::MachineSchedStrategy | |
| virtual | ~MachineSchedStrategy ()=default |
| virtual void | scheduleTree (unsigned SubtreeID) |
| Scheduler callback to notify that a new subtree is scheduled. More... | |
Additional Inherited Members | |
Public Types inherited from llvm::GenericSchedulerBase | |
| enum | CandReason : uint8_t { NoCand, Only1, PhysRegCopy, RegExcess, RegCritical, Stall, Cluster, Weak, RegMax, ResourceReduce, ResourceDemand, BotHeightReduce, BotPathReduce, TopDepthReduce, TopPathReduce, NextDefUse, NodeOrder } |
| Represent the type of SchedCandidate found within a single queue. More... | |
Static Public Member Functions inherited from llvm::GenericSchedulerBase | |
| static const char * | getReasonStr (GenericSchedulerBase::CandReason Reason) |
Protected Member Functions inherited from llvm::GenericScheduler | |
| void | checkAcyclicLatency () |
| Set IsAcyclicLatencyLimited if the acyclic path is longer than the cyclic critical path by more cycles than it takes to drain the instruction buffer. More... | |
| void | initCandidate (SchedCandidate &Cand, SUnit *SU, bool AtTop, const RegPressureTracker &RPTracker, RegPressureTracker &TempTracker) |
| void | tryCandidate (SchedCandidate &Cand, SchedCandidate &TryCand, SchedBoundary *Zone) |
| Apply a set of heursitics to a new candidate. More... | |
| SUnit * | pickNodeBidirectional (bool &IsTopNode) |
| Pick the best candidate node from either the top or bottom queue. More... | |
| void | pickNodeFromQueue (SchedBoundary &Zone, const CandPolicy &ZonePolicy, const RegPressureTracker &RPTracker, SchedCandidate &Candidate) |
| Pick the best candidate from the queue. More... | |
| void | reschedulePhysRegCopies (SUnit *SU, bool isTop) |
Protected Member Functions inherited from llvm::GenericSchedulerBase | |
| GenericSchedulerBase (const MachineSchedContext *C) | |
| void | setPolicy (CandPolicy &Policy, bool IsPostRA, SchedBoundary &CurrZone, SchedBoundary *OtherZone) |
| Set the CandPolicy given a scheduling zone given the current resources and latencies inside and outside the zone. More... | |
| void | traceCandidate (const SchedCandidate &Cand) |
Protected Attributes inherited from llvm::GenericScheduler | |
| ScheduleDAGMILive * | DAG |
| MachineSchedPolicy | RegionPolicy |
| SchedBoundary | Top |
| SchedBoundary | Bot |
| SchedCandidate | TopCand |
| Candidate last picked from Top boundary. More... | |
| SchedCandidate | BotCand |
| Candidate last picked from Bot boundary. More... | |
Protected Attributes inherited from llvm::GenericSchedulerBase | |
| const MachineSchedContext * | Context |
| const TargetSchedModel * | SchedModel |
| const TargetRegisterInfo * | TRI |
| SchedRemainder | Rem |
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).
Definition at line 27 of file GCNSchedStrategy.h.
| GCNMaxOccupancySchedStrategy::GCNMaxOccupancySchedStrategy | ( | const MachineSchedContext * | C | ) |
Definition at line 26 of file GCNSchedStrategy.cpp.
Pick the best node to balance the schedule. Implements MachineSchedStrategy.
Reimplemented from llvm::GenericScheduler.
Definition at line 272 of file GCNSchedStrategy.cpp.
References assert(), llvm::SchedBoundary::Available, llvm::GenericScheduler::Bot, llvm::GenericScheduler::BotCand, llvm::ScheduleDAGMI::bottom(), llvm::GenericScheduler::DAG, llvm::dbgs(), DEBUG, llvm::ReadyQueue::empty(), llvm::ScheduleDAGMILive::getBotRPTracker(), llvm::SUnit::getInstr(), llvm::ScheduleDAGMILive::getTopRPTracker(), llvm::SUnit::isBottomReady(), llvm::SUnit::isScheduled, llvm::SUnit::isTopReady(), llvm::GenericSchedulerBase::NoCand, llvm::SUnit::NodeNum, llvm::MachineSchedPolicy::OnlyBottomUp, llvm::MachineSchedPolicy::OnlyTopDown, llvm::SchedBoundary::Pending, llvm::SchedBoundary::pickOnlyChoice(), llvm::GenericSchedulerBase::SchedCandidate::Reason, llvm::GenericScheduler::RegionPolicy, llvm::SchedBoundary::removeReady(), llvm::GenericSchedulerBase::SchedCandidate::reset(), llvm::GenericSchedulerBase::SchedCandidate::SU, llvm::ScheduleDAGMI::top(), llvm::GenericScheduler::Top, and llvm::GenericScheduler::TopCand.
1.8.6