MachineScheduler.cpp File Reference

#include "llvm/CodeGen/MachineScheduler.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/PriorityQueue.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/CodeGen/LiveInterval.h"
#include "llvm/CodeGen/LiveIntervals.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachinePassRegistry.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterClassInfo.h"
#include "llvm/CodeGen/RegisterPressure.h"
#include "llvm/CodeGen/ScheduleDAG.h"
#include "llvm/CodeGen/ScheduleDAGInstrs.h"
#include "llvm/CodeGen/ScheduleDAGMutation.h"
#include "llvm/CodeGen/ScheduleDFS.h"
#include "llvm/CodeGen/ScheduleHazardRecognizer.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSchedule.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/CodeGenTypes/MachineValueType.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/InitializePasses.h"
#include "llvm/MC/LaneBitmask.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <iterator>
#include <limits>
#include <memory>
#include <string>
#include <tuple>
#include <utility>
#include <vector>

Go to the source code of this file.

Classes
struct	llvm::GraphTraits< ScheduleDAGMI * >
struct	llvm::DOTGraphTraits< ScheduleDAGMI * >

Namespaces
namespace	llvm
	This is an optimization pass for GlobalISel generic memory operations.

Macros
#define	DEBUG_TYPE   "machine-scheduler"

Typedefs
using	MBBRegionsVector = SmallVector< SchedRegion, 16 >

Functions
	STATISTIC (NumClustered, "Number of load/store pairs clustered")
cl::opt< MISched::Direction >	llvm::PreRADirection ("misched-prera-direction", cl::Hidden, cl::desc("Pre reg-alloc list scheduling direction"), cl::init(MISched::Unspecified), cl::values(clEnumValN(MISched::TopDown, "topdown", "Force top-down pre reg-alloc list scheduling"), clEnumValN(MISched::BottomUp, "bottomup", "Force bottom-up pre reg-alloc list scheduling"), clEnumValN(MISched::Bidirectional, "bidirectional", "Force bidirectional pre reg-alloc list scheduling")))
cl::opt< bool >	llvm::VerifyScheduling ("verify-misched", cl::Hidden, cl::desc("Verify machine instrs before and after machine scheduling"))
cl::opt< bool >	llvm::ViewMISchedDAGs ("view-misched-dags", cl::Hidden, cl::desc("Pop up a window to show MISched dags after they are processed"))
cl::opt< bool >	llvm::PrintDAGs ("misched-print-dags", cl::Hidden, cl::desc("Print schedule DAGs"))
	INITIALIZE_PASS_BEGIN (MachineScheduler, DEBUG_TYPE, "Machine Instruction Scheduler", false, false) INITIALIZE_PASS_END(MachineScheduler
	INITIALIZE_PASS_BEGIN (PostMachineScheduler, "postmisched", "PostRA Machine Instruction Scheduler", false, false) INITIALIZE_PASS_END(PostMachineScheduler
static ScheduleDAGInstrs *	useDefaultMachineSched (MachineSchedContext *C)
	A dummy default scheduler factory indicates whether the scheduler is overridden on the command line.
static MachineBasicBlock::const_iterator	priorNonDebug (MachineBasicBlock::const_iterator I, MachineBasicBlock::const_iterator Beg)
	Decrement this iterator until reaching the top or a non-debug instr.
static MachineBasicBlock::iterator	priorNonDebug (MachineBasicBlock::iterator I, MachineBasicBlock::const_iterator Beg)
	Non-const version.
static MachineBasicBlock::const_iterator	nextIfDebug (MachineBasicBlock::const_iterator I, MachineBasicBlock::const_iterator End)
	If this iterator is a debug value, increment until reaching the End or a non-debug instruction.
static MachineBasicBlock::iterator	nextIfDebug (MachineBasicBlock::iterator I, MachineBasicBlock::const_iterator End)
	Non-const version.
static bool	isSchedBoundary (MachineBasicBlock::iterator MI, MachineBasicBlock *MBB, MachineFunction *MF, const TargetInstrInfo *TII)
	Return true of the given instruction should not be included in a scheduling region.
static void	getSchedRegions (MachineBasicBlock *MBB, MBBRegionsVector &Regions, bool RegionsTopDown)
std::unique_ptr< ScheduleDAGMutation >	llvm::createLoadClusterDAGMutation (const TargetInstrInfo *TII, const TargetRegisterInfo *TRI, bool ReorderWhileClustering=false)
	If ReorderWhileClustering is set to true, no attempt will be made to reduce reordering due to store clustering.
std::unique_ptr< ScheduleDAGMutation >	llvm::createStoreClusterDAGMutation (const TargetInstrInfo *TII, const TargetRegisterInfo *TRI, bool ReorderWhileClustering=false)
	If ReorderWhileClustering is set to true, no attempt will be made to reduce reordering due to store clustering.
std::unique_ptr< ScheduleDAGMutation >	llvm::createCopyConstrainDAGMutation (const TargetInstrInfo *TII, const TargetRegisterInfo *TRI)
static bool	checkResourceLimit (unsigned LFactor, unsigned Count, unsigned Latency, bool AfterSchedNode)
	Given a Count of resource usage and a Latency value, return true if a SchedBoundary becomes resource limited.
static unsigned	computeRemLatency (SchedBoundary &CurrZone)
	Compute remaining latency.
bool	llvm::tryLess (int TryVal, int CandVal, GenericSchedulerBase::SchedCandidate &TryCand, GenericSchedulerBase::SchedCandidate &Cand, GenericSchedulerBase::CandReason Reason)
	Return true if this heuristic determines order.
bool	llvm::tryGreater (int TryVal, int CandVal, GenericSchedulerBase::SchedCandidate &TryCand, GenericSchedulerBase::SchedCandidate &Cand, GenericSchedulerBase::CandReason Reason)
bool	llvm::tryLatency (GenericSchedulerBase::SchedCandidate &TryCand, GenericSchedulerBase::SchedCandidate &Cand, SchedBoundary &Zone)
static void	tracePick (GenericSchedulerBase::CandReason Reason, bool IsTop)
static void	tracePick (const GenericSchedulerBase::SchedCandidate &Cand)
bool	llvm::tryPressure (const PressureChange &TryP, const PressureChange &CandP, GenericSchedulerBase::SchedCandidate &TryCand, GenericSchedulerBase::SchedCandidate &Cand, GenericSchedulerBase::CandReason Reason, const TargetRegisterInfo *TRI, const MachineFunction &MF)
unsigned	llvm::getWeakLeft (const SUnit *SU, bool isTop)
int	llvm::biasPhysReg (const SUnit *SU, bool isTop)
	Minimize physical register live ranges.
static ScheduleDAGInstrs *	createConvergingSched (MachineSchedContext *C)
static ScheduleDAGInstrs *	createILPMaxScheduler (MachineSchedContext *C)
static ScheduleDAGInstrs *	createILPMinScheduler (MachineSchedContext *C)
static ScheduleDAGInstrs *	createInstructionShuffler (MachineSchedContext *C)
static bool	sortIntervals (const ResourceSegments::IntervalTy &A, const ResourceSegments::IntervalTy &B)
	Sort predicate for the intervals stored in an instance of ResourceSegments.

Variables
cl::opt< MISched::Direction >	llvm::PostRADirection ("misched-postra-direction", cl::Hidden, cl::desc("Post reg-alloc list scheduling direction"), cl::init(MISched::Unspecified), cl::values(clEnumValN(MISched::TopDown, "topdown", "Force top-down post reg-alloc list scheduling"), clEnumValN(MISched::BottomUp, "bottomup", "Force bottom-up post reg-alloc list scheduling"), clEnumValN(MISched::Bidirectional, "bidirectional", "Force bidirectional post reg-alloc list scheduling")))
cl::opt< bool >	llvm::DumpCriticalPathLength ("misched-dcpl", cl::Hidden, cl::desc("Print critical path length to stdout"))
cl::opt< bool >	llvm::MISchedDumpReservedCycles ("misched-dump-reserved-cycles", cl::Hidden, cl::init(false), cl::desc("Dump resource usage at schedule boundary."))
cl::opt< bool >	llvm::MischedDetailResourceBooking ("misched-detail-resource-booking", cl::Hidden, cl::init(false), cl::desc("Show details of invoking getNextResoufceCycle."))
static cl::opt< unsigned >	ViewMISchedCutoff ("view-misched-cutoff", cl::Hidden, cl::desc("Hide nodes with more predecessor/successor than cutoff"))
	In some situations a few uninteresting nodes depend on nearly all other nodes in the graph, provide a cutoff to hide them.
static cl::opt< unsigned >	MISchedCutoff ("misched-cutoff", cl::Hidden, cl::desc("Stop scheduling after N instructions"), cl::init(~0U))
static cl::opt< std::string >	SchedOnlyFunc ("misched-only-func", cl::Hidden, cl::desc("Only schedule this function"))
static cl::opt< unsigned >	SchedOnlyBlock ("misched-only-block", cl::Hidden, cl::desc("Only schedule this MBB#"))
static cl::opt< unsigned >	ReadyListLimit ("misched-limit", cl::Hidden, cl::desc("Limit ready list to N instructions"), cl::init(256))
	Avoid quadratic complexity in unusually large basic blocks by limiting the size of the ready lists.
static cl::opt< bool >	EnableRegPressure ("misched-regpressure", cl::Hidden, cl::desc("Enable register pressure scheduling."), cl::init(true))
static cl::opt< bool >	EnableCyclicPath ("misched-cyclicpath", cl::Hidden, cl::desc("Enable cyclic critical path analysis."), cl::init(true))
static cl::opt< bool >	EnableMemOpCluster ("misched-cluster", cl::Hidden, cl::desc("Enable memop clustering."), cl::init(true))
static cl::opt< bool >	ForceFastCluster ("force-fast-cluster", cl::Hidden, cl::desc("Switch to fast cluster algorithm with the lost " "of some fusion opportunities"), cl::init(false))
static cl::opt< unsigned >	FastClusterThreshold ("fast-cluster-threshold", cl::Hidden, cl::desc("The threshold for fast cluster"), cl::init(1000))
static cl::opt< bool >	MISchedDumpScheduleTrace ("misched-dump-schedule-trace", cl::Hidden, cl::init(false), cl::desc("Dump resource usage at schedule boundary."))
static cl::opt< unsigned >	HeaderColWidth ("misched-dump-schedule-trace-col-header-width", cl::Hidden, cl::desc("Set width of the columns with " "the resources and schedule units"), cl::init(19))
static cl::opt< unsigned >	ColWidth ("misched-dump-schedule-trace-col-width", cl::Hidden, cl::desc("Set width of the columns showing resource booking."), cl::init(5))
static cl::opt< bool >	MISchedSortResourcesInTrace ("misched-sort-resources-in-trace", cl::Hidden, cl::init(true), cl::desc("Sort the resources printed in the dump trace"))
static cl::opt< unsigned >	MIResourceCutOff ("misched-resource-cutoff", cl::Hidden, cl::desc("Number of intervals to track"), cl::init(10))
static const unsigned	MinSubtreeSize = 8
	DEBUG_TYPE
Machine Instruction	Scheduler
Machine Instruction	false
	postmisched
static cl::opt< MachineSchedRegistry::ScheduleDAGCtor, false, RegisterPassParser< MachineSchedRegistry > >	MachineSchedOpt ("misched", cl::init(&useDefaultMachineSched), cl::Hidden, cl::desc("Machine instruction scheduler to use"))
	MachineSchedOpt allows command line selection of the scheduler.
static MachineSchedRegistry	DefaultSchedRegistry ("default", "Use the target's default scheduler choice.", useDefaultMachineSched)
static cl::opt< bool >	EnableMachineSched ("enable-misched", cl::desc("Enable the machine instruction scheduling pass."), cl::init(true), cl::Hidden)
static cl::opt< bool >	EnablePostRAMachineSched ("enable-post-misched", cl::desc("Enable the post-ra machine instruction scheduling pass."), cl::init(true), cl::Hidden)
static const char *	scheduleTableLegend = " i: issue\n x: resource booked"
static const unsigned	InvalidCycle = ~0U
static MachineSchedRegistry	GenericSchedRegistry ("converge", "Standard converging scheduler.", createConvergingSched)
static MachineSchedRegistry	ILPMaxRegistry ("ilpmax", "Schedule bottom-up for max ILP", createILPMaxScheduler)
static MachineSchedRegistry	ILPMinRegistry ("ilpmin", "Schedule bottom-up for min ILP", createILPMinScheduler)
static MachineSchedRegistry	ShufflerRegistry ("shuffle", "Shuffle machine instructions alternating directions", createInstructionShuffler)

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "machine-scheduler"

Definition at line 74 of file MachineScheduler.cpp.

Typedef Documentation

MBBRegionsVector

using MBBRegionsVector = SmallVector<SchedRegion, 16>

Definition at line 539 of file MachineScheduler.cpp.

Function Documentation

checkResourceLimit()

static bool checkResourceLimit ( unsigned  LFactor, unsigned  Count, unsigned  Latency, bool  AfterSchedNode  )

static

Given a Count of resource usage and a Latency value, return true if a SchedBoundary becomes resource limited.

If we are checking after scheduling a node, we should return true when we just reach the resource limit.

Definition at line 2235 of file MachineScheduler.cpp.

References llvm::Latency.

Referenced by llvm::SchedBoundary::bumpCycle(), llvm::SchedBoundary::bumpNode(), and llvm::GenericSchedulerBase::setPolicy().

computeRemLatency()

static unsigned computeRemLatency ( SchedBoundary &  CurrZone )

static

Compute remaining latency.

We need this both to determine whether the overall schedule has become latency-limited and whether the instructions outside this zone are resource or latency limited.

The "dependent" latency is updated incrementally during scheduling as the max height/depth of scheduled nodes minus the cycles since it was scheduled: DLat = max (N.depth - (CurrCycle - N.ReadyCycle) for N in Zone

The "independent" latency is the max ready queue depth: ILat = max N.depth for N in Available|Pending

RemainingLatency is the greater of independent and dependent latency.

These computations are expensive, especially in DAGs with many edges, so only do them if necessary.

Definition at line 3003 of file MachineScheduler.cpp.

References llvm::SchedBoundary::Available, llvm::ReadyQueue::elements(), llvm::SchedBoundary::findMaxLatency(), llvm::SchedBoundary::getDependentLatency(), and llvm::SchedBoundary::Pending.

Referenced by llvm::GenericSchedulerBase::setPolicy().

createConvergingSched()

static ScheduleDAGInstrs * createConvergingSched ( MachineSchedContext *  C )

static

Definition at line 3864 of file MachineScheduler.cpp.

References llvm::CallingConv::C, and llvm::createGenericSchedLive().

createILPMaxScheduler()

static ScheduleDAGInstrs * createILPMaxScheduler ( MachineSchedContext *  C )

static

Definition at line 4272 of file MachineScheduler.cpp.

References llvm::CallingConv::C.

createILPMinScheduler()

static ScheduleDAGInstrs * createILPMinScheduler ( MachineSchedContext *  C )

static

Definition at line 4275 of file MachineScheduler.cpp.

References llvm::CallingConv::C.

createInstructionShuffler()

static ScheduleDAGInstrs * createInstructionShuffler ( MachineSchedContext *  C )

static

Definition at line 4364 of file MachineScheduler.cpp.

References llvm::MISched::BottomUp, llvm::CallingConv::C, llvm::PreRADirection, and llvm::MISched::TopDown.

getSchedRegions()

static void getSchedRegions ( MachineBasicBlock *  MBB, MBBRegionsVector &  Regions, bool  RegionsTopDown  )

static

Definition at line 542 of file MachineScheduler.cpp.

References llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::MachineBasicBlock::begin(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::MachineBasicBlock::end(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getSubtarget(), I, isSchedBoundary(), MBB, MI, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and TII.

INITIALIZE_PASS_BEGIN() [1/2]

INITIALIZE_PASS_BEGIN	(	MachineScheduler	,
		DEBUG_TYPE	,
		"Machine Instruction Scheduler"	,
		false	,
		false
	)

INITIALIZE_PASS_BEGIN() [2/2]

INITIALIZE_PASS_BEGIN	(	PostMachineScheduler	,
		"postmisched"	,
		"PostRA Machine Instruction Scheduler"	,
		false	,
		false
	)

isSchedBoundary()

static bool isSchedBoundary ( MachineBasicBlock::iterator  MI, MachineBasicBlock *  MBB, MachineFunction *  MF, const TargetInstrInfo *  TII  )

static

Return true of the given instruction should not be included in a scheduling region.

MachineScheduler does not currently support scheduling across calls. To handle calls, the DAG builder needs to be modified to create register anti/output dependencies on the registers clobbered by the call's regmask operand. In PreRA scheduling, the stack pointer adjustment already prevents scheduling across calls. In PostRA scheduling, we need the isCall to enforce the boundary, but there would be no benefit to postRA scheduling across calls this late anyway.

Definition at line 513 of file MachineScheduler.cpp.

References llvm::HexagonInstrInfo::isSchedulingBoundary(), MBB, MI, and TII.

Referenced by getSchedRegions().

nextIfDebug() [1/2]

static MachineBasicBlock::const_iterator nextIfDebug ( MachineBasicBlock::const_iterator  I, MachineBasicBlock::const_iterator  End  )

static

If this iterator is a debug value, increment until reaching the End or a non-debug instruction.

Definition at line 371 of file MachineScheduler.cpp.

References End, and I.

Referenced by llvm::ScheduleDAGMI::initQueues(), nextIfDebug(), llvm::ScheduleDAGMI::schedule(), llvm::ScheduleDAGMILive::scheduleMI(), and llvm::ScheduleDAGMILive::updatePressureDiffs().

nextIfDebug() [2/2]

static MachineBasicBlock::iterator nextIfDebug ( MachineBasicBlock::iterator  I, MachineBasicBlock::const_iterator  End  )

static

Non-const version.

Definition at line 382 of file MachineScheduler.cpp.

References End, llvm::MachineInstrBundleIterator< Ty, IsReverse >::getNonConstIterator(), I, and nextIfDebug().

priorNonDebug() [1/2]

static MachineBasicBlock::const_iterator priorNonDebug ( MachineBasicBlock::const_iterator  I, MachineBasicBlock::const_iterator  Beg  )

static

Decrement this iterator until reaching the top or a non-debug instr.

Definition at line 350 of file MachineScheduler.cpp.

References assert(), and I.

Referenced by llvm::ScheduleDAGMILive::initRegPressure(), priorNonDebug(), llvm::ScheduleDAGMI::schedule(), and llvm::ScheduleDAGMILive::scheduleMI().

priorNonDebug() [2/2]

static MachineBasicBlock::iterator priorNonDebug ( MachineBasicBlock::iterator  I, MachineBasicBlock::const_iterator  Beg  )

static

Non-const version.

Definition at line 362 of file MachineScheduler.cpp.

References llvm::MachineInstrBundleIterator< Ty, IsReverse >::getNonConstIterator(), I, and priorNonDebug().

sortIntervals()

static bool sortIntervals ( const ResourceSegments::IntervalTy &  A, const ResourceSegments::IntervalTy &  B  )

static

Sort predicate for the intervals stored in an instance of ResourceSegments.

Intervals are always disjoint (no intersection for any pairs of intervals), therefore we can sort the totality of the intervals by looking only at the left boundary.

Definition at line 4471 of file MachineScheduler.cpp.

References A, and B.

STATISTIC()

STATISTIC	(	NumClustered	,
		"Number of load/store pairs clustered"
	)

tracePick() [1/2]

static void tracePick ( const GenericSchedulerBase::SchedCandidate &  Cand )

static

Definition at line 3242 of file MachineScheduler.cpp.

References llvm::GenericSchedulerBase::SchedCandidate::AtTop, llvm::GenericSchedulerBase::SchedCandidate::Reason, and tracePick().

tracePick() [2/2]

static void tracePick ( GenericSchedulerBase::CandReason  Reason, bool  IsTop  )

static

Definition at line 3237 of file MachineScheduler.cpp.

References llvm::dbgs(), llvm::GenericSchedulerBase::getReasonStr(), and LLVM_DEBUG.

Referenced by llvm::GenericScheduler::pickNode(), llvm::PostGenericScheduler::pickNode(), llvm::GenericScheduler::pickNodeBidirectional(), llvm::PostGenericScheduler::pickNodeBidirectional(), and tracePick().

useDefaultMachineSched()

static ScheduleDAGInstrs * useDefaultMachineSched ( MachineSchedContext *  C )

static

A dummy default scheduler factory indicates whether the scheduler is overridden on the command line.

Definition at line 323 of file MachineScheduler.cpp.

Variable Documentation

ColWidth

cl::opt< unsigned > ColWidth("misched-dump-schedule-trace-col-width", cl::Hidden, cl::desc("Set width of the columns showing resource booking."), cl::init(5)) ( "misched-dump-schedule-trace-col-width"  , cl::Hidden  , cl::desc("Set width of the columns showing resource booking.")  , cl::init(5)    )

static

Referenced by llvm::ScheduleDAGMI::dumpScheduleTraceBottomUp(), and llvm::ScheduleDAGMI::dumpScheduleTraceTopDown().

DEBUG_TYPE

DEBUG_TYPE

Definition at line 273 of file MachineScheduler.cpp.

DefaultSchedRegistry

MachineSchedRegistry DefaultSchedRegistry("default", "Use the target's default scheduler choice.", useDefaultMachineSched) ( "default"  , "Use the target's default scheduler choice."  , useDefaultMachineSched    )

static

EnableCyclicPath

cl::opt< bool > EnableCyclicPath("misched-cyclicpath", cl::Hidden, cl::desc("Enable cyclic critical path analysis."), cl::init(true)) ( "misched-cyclicpath"  , cl::Hidden  , cl::desc("Enable cyclic critical path analysis.")  , cl::init(true)    )

static

Referenced by llvm::GenericScheduler::registerRoots().

EnableMachineSched

cl::opt< bool > EnableMachineSched("enable-misched", cl::desc("Enable the machine instruction scheduling pass."), cl::init(true), cl::Hidden) ( "enable-misched"  , cl::desc("Enable the machine instruction scheduling pass.")  , cl::init(true)  , cl::Hidden    )

static

EnableMemOpCluster

cl::opt< bool > EnableMemOpCluster("misched-cluster", cl::Hidden, cl::desc("Enable memop clustering."), cl::init(true)) ( "misched-cluster"  , cl::Hidden  , cl::desc("Enable memop clustering.")  , cl::init(true)    )

static

Referenced by llvm::createLoadClusterDAGMutation(), and llvm::createStoreClusterDAGMutation().

EnablePostRAMachineSched

cl::opt< bool > EnablePostRAMachineSched("enable-post-misched", cl::desc("Enable the post-ra machine instruction scheduling pass."), cl::init(true), cl::Hidden) ( "enable-post-misched"  , cl::desc("Enable the post-ra machine instruction scheduling pass.")  , cl::init(true)  , cl::Hidden    )

static

EnableRegPressure

cl::opt< bool > EnableRegPressure("misched-regpressure", cl::Hidden, cl::desc("Enable register pressure scheduling."), cl::init(true)) ( "misched-regpressure"  , cl::Hidden  , cl::desc("Enable register pressure scheduling.")  , cl::init(true)    )

static

Referenced by llvm::GenericScheduler::initPolicy().

false

PostRA Machine Instruction false

Definition at line 274 of file MachineScheduler.cpp.

FastClusterThreshold

cl::opt< unsigned > FastClusterThreshold("fast-cluster-threshold", cl::Hidden, cl::desc("The threshold for fast cluster"), cl::init(1000)) ( "fast-cluster-threshold"  , cl::Hidden  , cl::desc("The threshold for fast cluster")  , cl::init(1000)    )

static

ForceFastCluster

cl::opt< bool > ForceFastCluster("force-fast-cluster", cl::Hidden, cl::desc("Switch to fast cluster algorithm with the lost " "of some fusion opportunities"), cl::init(false)) ( "force-fast-cluster"  , cl::Hidden  , cl::desc("Switch to fast cluster algorithm with the lost " "of some fusion opportunities")  , cl::init(false)    )

static

GenericSchedRegistry

MachineSchedRegistry GenericSchedRegistry("converge", "Standard converging scheduler.", createConvergingSched) ( "converge"  , "Standard converging scheduler."  , createConvergingSched    )

static

HeaderColWidth

cl::opt< unsigned > HeaderColWidth("misched-dump-schedule-trace-col-header-width", cl::Hidden, cl::desc("Set width of the columns with " "the resources and schedule units"), cl::init(19)) ( "misched-dump-schedule-trace-col-header-width"  , cl::Hidden  , cl::desc("Set width of the columns with " "the resources and schedule units")  , cl::init(19)    )

static

Referenced by llvm::ScheduleDAGMI::dumpScheduleTraceBottomUp(), and llvm::ScheduleDAGMI::dumpScheduleTraceTopDown().

ILPMaxRegistry

MachineSchedRegistry ILPMaxRegistry("ilpmax", "Schedule bottom-up for max ILP", createILPMaxScheduler) ( "ilpmax"  , "Schedule bottom-up for max ILP"  , createILPMaxScheduler    )

static

ILPMinRegistry

MachineSchedRegistry ILPMinRegistry("ilpmin", "Schedule bottom-up for min ILP", createILPMinScheduler) ( "ilpmin"  , "Schedule bottom-up for min ILP"  , createILPMinScheduler    )

static

InvalidCycle

const unsigned InvalidCycle = ~0U

static

Definition at line 2227 of file MachineScheduler.cpp.

Referenced by llvm::SchedBoundary::getNextResourceCycle(), llvm::SchedBoundary::getNextResourceCycleByInstance(), and llvm::SchedBoundary::init().

MachineSchedOpt

cl::opt< MachineSchedRegistry::ScheduleDAGCtor, false, RegisterPassParser< MachineSchedRegistry > > MachineSchedOpt("misched", cl::init(&useDefaultMachineSched), cl::Hidden, cl::desc("Machine instruction scheduler to use")) ( "misched"  , cl::init &  useDefaultMachineSched, cl::Hidden  , cl::desc("Machine instruction scheduler to use")    )

static

MachineSchedOpt allows command line selection of the scheduler.

MinSubtreeSize

const unsigned MinSubtreeSize = 8

static

Definition at line 197 of file MachineScheduler.cpp.

Referenced by llvm::ScheduleDAGMILive::computeDFSResult().

MIResourceCutOff

cl::opt< unsigned > MIResourceCutOff("misched-resource-cutoff", cl::Hidden, cl::desc("Number of intervals to track"), cl::init(10)) ( "misched-resource-cutoff"  , cl::Hidden  , cl::desc("Number of intervals to track")  , cl::init(10)    )

static

Referenced by llvm::SchedBoundary::bumpNode().

MISchedCutoff

cl::opt< unsigned > MISchedCutoff("misched-cutoff", cl::Hidden, cl::desc("Stop scheduling after N instructions"), cl::init(~0U)) ( "misched-cutoff"  , cl::Hidden  , cl::desc("Stop scheduling after N instructions")  , cl::init(~0U)    )

static

Referenced by llvm::ScheduleDAGMI::checkSchedLimit().

MISchedDumpScheduleTrace

cl::opt< bool > MISchedDumpScheduleTrace("misched-dump-schedule-trace", cl::Hidden, cl::init(false), cl::desc("Dump resource usage at schedule boundary.")) ( "misched-dump-schedule-trace"  , cl::Hidden  , cl::init(false)  , cl::desc("Dump resource usage at schedule boundary.")    )

static

Referenced by llvm::ScheduleDAGMI::dumpSchedule().

MISchedSortResourcesInTrace

cl::opt< bool > MISchedSortResourcesInTrace("misched-sort-resources-in-trace", cl::Hidden, cl::init(true), cl::desc("Sort the resources printed in the dump trace")) ( "misched-sort-resources-in-trace"  , cl::Hidden  , cl::init(true)  , cl::desc("Sort the resources printed in the dump trace")    )

static

Referenced by llvm::ScheduleDAGMI::dumpScheduleTraceBottomUp(), and llvm::ScheduleDAGMI::dumpScheduleTraceTopDown().

postmisched

postmisched

Definition at line 302 of file MachineScheduler.cpp.

ReadyListLimit

cl::opt< unsigned > ReadyListLimit("misched-limit", cl::Hidden, cl::desc("Limit ready list to N instructions"), cl::init(256)) ( "misched-limit"  , cl::Hidden  , cl::desc("Limit ready list to N instructions")  , cl::init(256)    )

static

Avoid quadratic complexity in unusually large basic blocks by limiting the size of the ready lists.

Referenced by llvm::SchedBoundary::releaseNode(), and llvm::SchedBoundary::releasePending().

SchedOnlyBlock

cl::opt< unsigned > SchedOnlyBlock("misched-only-block", cl::Hidden, cl::desc("Only schedule this MBB#")) ( "misched-only-block"  , cl::Hidden  , cl::desc("Only schedule this MBB#")    )

static

SchedOnlyFunc

cl::opt< std::string > SchedOnlyFunc("misched-only-func", cl::Hidden, cl::desc("Only schedule this function")) ( "misched-only-func"  , cl::Hidden  , cl::desc("Only schedule this function")    )

static

Scheduler

PostRA Machine Instruction Scheduler

Definition at line 274 of file MachineScheduler.cpp.

Referenced by llvm::SIScheduleDAGMI::schedule(), and llvm::SIScheduler::scheduleVariant().

scheduleTableLegend

const char* scheduleTableLegend = " i: issue\n x: resource booked"

static

Definition at line 991 of file MachineScheduler.cpp.

Referenced by llvm::ScheduleDAGMI::dumpScheduleTraceBottomUp(), and llvm::ScheduleDAGMI::dumpScheduleTraceTopDown().

ShufflerRegistry

MachineSchedRegistry ShufflerRegistry("shuffle", "Shuffle machine instructions alternating directions", createInstructionShuffler) ( "shuffle"  , "Shuffle machine instructions alternating directions"  , createInstructionShuffler    )

static

ViewMISchedCutoff

cl::opt< unsigned > ViewMISchedCutoff("view-misched-cutoff", cl::Hidden, cl::desc("Hide nodes with more predecessor/successor than cutoff")) ( "view-misched-cutoff"  , cl::Hidden  , cl::desc("Hide nodes with more predecessor/successor than cutoff")    )

static

In some situations a few uninteresting nodes depend on nearly all other nodes in the graph, provide a cutoff to hide them.

Referenced by llvm::DOTGraphTraits< ScheduleDAGMI * >::isNodeHidden().