LLVM 20.0.0git
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A MachineSchedStrategy implementation for PowerPC pre RA scheduling. More...
#include "Target/PowerPC/PPCMachineScheduler.h"
Public Member Functions | |
PPCPreRASchedStrategy (const MachineSchedContext *C) | |
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. | |
void | dumpPolicy () const override |
bool | shouldTrackPressure () const override |
Check if pressure tracking is needed before building the DAG and initializing this strategy. | |
bool | shouldTrackLaneMasks () const override |
Returns true if lanemasks should be tracked. | |
void | initialize (ScheduleDAGMI *dag) override |
Initialize the strategy after building the DAG for a new region. | |
SUnit * | pickNode (bool &IsTopNode) override |
Pick the best node to balance the schedule. Implements MachineSchedStrategy. | |
void | schedNode (SUnit *SU, bool IsTopNode) override |
Update the scheduler's state after scheduling a node. | |
void | releaseTopNode (SUnit *SU) override |
When all predecessor dependencies have been resolved, free this node for top-down scheduling. | |
void | releaseBottomNode (SUnit *SU) override |
When all successor dependencies have been resolved, free this node for bottom-up scheduling. | |
void | registerRoots () override |
Notify this strategy that all roots have been released (including those that depend on EntrySU or ExitSU). | |
Public Member Functions inherited from llvm::MachineSchedStrategy | |
virtual | ~MachineSchedStrategy ()=default |
virtual void | initPolicy (MachineBasicBlock::iterator Begin, MachineBasicBlock::iterator End, unsigned NumRegionInstrs) |
Optionally override the per-region scheduling policy. | |
virtual MachineSchedPolicy | getPolicy () const |
virtual void | dumpPolicy () const |
virtual bool | shouldTrackPressure () const |
Check if pressure tracking is needed before building the DAG and initializing this strategy. | |
virtual bool | shouldTrackLaneMasks () const |
Returns true if lanemasks should be tracked. | |
virtual bool | doMBBSchedRegionsTopDown () const |
virtual void | initialize (ScheduleDAGMI *DAG)=0 |
Initialize the strategy after building the DAG for a new region. | |
virtual void | enterMBB (MachineBasicBlock *MBB) |
Tell the strategy that MBB is about to be processed. | |
virtual void | leaveMBB () |
Tell the strategy that current MBB is done. | |
virtual void | registerRoots () |
Notify this strategy that all roots have been released (including those that depend on EntrySU or ExitSU). | |
virtual SUnit * | pickNode (bool &IsTopNode)=0 |
Pick the next node to schedule, or return NULL. | |
virtual void | scheduleTree (unsigned SubtreeID) |
Scheduler callback to notify that a new subtree is scheduled. | |
virtual void | schedNode (SUnit *SU, bool IsTopNode)=0 |
Notify MachineSchedStrategy that ScheduleDAGMI has scheduled an instruction and updated scheduled/remaining flags in the DAG nodes. | |
virtual void | releaseTopNode (SUnit *SU)=0 |
When all predecessor dependencies have been resolved, free this node for top-down scheduling. | |
virtual void | releaseBottomNode (SUnit *SU)=0 |
When all successor dependencies have been resolved, free this node for bottom-up scheduling. | |
Protected Member Functions | |
bool | tryCandidate (SchedCandidate &Cand, SchedCandidate &TryCand, SchedBoundary *Zone) const override |
Apply a set of heuristics to a new candidate. | |
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. | |
void | initCandidate (SchedCandidate &Cand, SUnit *SU, bool AtTop, const RegPressureTracker &RPTracker, RegPressureTracker &TempTracker) |
virtual bool | tryCandidate (SchedCandidate &Cand, SchedCandidate &TryCand, SchedBoundary *Zone) const |
Apply a set of heuristics to a new candidate. | |
SUnit * | pickNodeBidirectional (bool &IsTopNode) |
Pick the best candidate node from either the top or bottom queue. | |
void | pickNodeFromQueue (SchedBoundary &Zone, const CandPolicy &ZonePolicy, const RegPressureTracker &RPTracker, SchedCandidate &Candidate) |
Pick the best candidate from the queue. | |
void | reschedulePhysReg (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. | |
MachineSchedPolicy | getPolicy () const override |
void | traceCandidate (const SchedCandidate &Cand) |
A MachineSchedStrategy implementation for PowerPC pre RA scheduling.
Definition at line 21 of file PPCMachineScheduler.h.
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inline |
Definition at line 23 of file PPCMachineScheduler.h.
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overrideprotectedvirtual |
Apply a set of heuristics to a new candidate.
Heuristics are currently hierarchical. This may be more efficient than a graduated cost model because we don't need to evaluate all aspects of the model for each node in the queue. But it's really done to make the heuristics easier to debug and statistically analyze.
Cand | provides the policy and current best candidate. |
TryCand | refers to the next SUnit candidate, otherwise uninitialized. |
Zone | describes the scheduled zone that we are extending, or nullptr if Cand is from a different zone than TryCand. |
true
if TryCand is better than Cand (Reason is NOT NoCand) Reimplemented from llvm::GenericScheduler.
Definition at line 49 of file PPCMachineScheduler.cpp.
References llvm::GenericSchedulerBase::SchedCandidate::AtTop, llvm::biasPhysReg(), llvm::GenericSchedulerBase::Cluster, llvm::RegPressureDelta::CriticalMax, llvm::GenericSchedulerBase::SchedResourceDelta::CritResources, llvm::RegPressureDelta::CurrentMax, llvm::GenericScheduler::DAG, llvm::GenericSchedulerBase::SchedResourceDelta::DemandedResources, llvm::MachineSchedPolicy::DisableLatencyHeuristic, llvm::RegPressureDelta::Excess, llvm::SchedBoundary::getCurrMOps(), llvm::SchedBoundary::getLatencyStallCycles(), llvm::ScheduleDAGMI::getNextClusterPred(), llvm::ScheduleDAGMI::getNextClusterSucc(), llvm::getWeakLeft(), llvm::GenericSchedulerBase::SchedCandidate::initResourceDelta(), llvm::SchedRemainder::IsAcyclicLatencyLimited, llvm::SchedBoundary::isTop(), llvm::ScheduleDAGMILive::isTrackingPressure(), llvm::GenericSchedulerBase::SchedCandidate::isValid(), llvm::ScheduleDAG::MF, llvm::GenericSchedulerBase::NoCand, llvm::SUnit::NodeNum, llvm::GenericSchedulerBase::NodeOrder, llvm::GenericSchedulerBase::PhysReg, llvm::GenericSchedulerBase::SchedCandidate::Policy, llvm::GenericSchedulerBase::SchedCandidate::Reason, llvm::GenericSchedulerBase::CandPolicy::ReduceLatency, llvm::GenericSchedulerBase::RegCritical, llvm::GenericSchedulerBase::RegExcess, llvm::GenericSchedulerBase::RegionPolicy, llvm::GenericSchedulerBase::RegMax, llvm::GenericSchedulerBase::Rem, llvm::GenericSchedulerBase::SchedCandidate::ResDelta, llvm::GenericSchedulerBase::ResourceDemand, llvm::GenericSchedulerBase::ResourceReduce, llvm::GenericSchedulerBase::SchedCandidate::RPDelta, llvm::GenericSchedulerBase::SchedModel, llvm::GenericSchedulerBase::Stall, llvm::GenericSchedulerBase::SchedCandidate::SU, llvm::GenericSchedulerBase::TRI, llvm::tryGreater(), llvm::tryLatency(), llvm::tryLess(), llvm::tryPressure(), and llvm::GenericSchedulerBase::Weak.