llvm::SUnit

Name

Description

const_pred_iterator

Const iterator over predecessor dependence edges.

const_succ_iterator

Const iterator over successor dependence edges.

pred_iterator

Mutable iterator over predecessor dependence edges.

succ_iterator

Mutable iterator over successor dependence edges.

Name

Description

SUnit [constructor]

Constructors

addPred

Adds the specified edge as a pred of the current node if not already. It also adds the current node as a successor of the specified node.

addPredBarrier

Adds a barrier edge to SU by calling addPred(), with latency 0 generally or latency 1 for a store followed by a load.

biasCriticalPath

Orders this node's predecessor edges such that the critical path edge occurs first.

dumpAttributes

Dump scheduling attributes of this SUnit for debugging.

getDepth

Returns the depth of this node, which is the length of the maximum path up to any node which has no predecessors.

getHeight

Returns the height of this node, which is the length of the maximum path down to any node which has no successors.

getInstr

Returns the representative MachineInstr for this SUnit. This may be used during post‐regalloc scheduling.

getNode

Returns the representative SDNode for this SUnit. This may be used during pre‐regalloc scheduling.

isBottomReady

Returns true if all successors have been scheduled.

isBoundaryNode

Boundary nodes are placeholders for the boundary of the scheduling region.

isClustered

Returns true if this SUnit belongs to a cluster group.

isInstr

Returns true if this SUnit refers to a machine instruction as opposed to an SDNode.

isPred

Tests if node N is a predecessor of this node.

isSucc

Tests if node N is a successor of this node.

isTopReady

Returns true if all predecessors have been scheduled.

removePred

Removes the specified edge as a pred of the current node if it exists. It also removes the current node as a successor of the specified node.

setDepthDirty

Sets a flag in this node to indicate that its stored Depth value will require recomputation the next time getDepth() is called.

setDepthToAtLeast

If NewDepth is greater than this node's depth value, sets it to be the new depth value. This also recursively marks successor nodes dirty.

setHeightDirty

Sets a flag in this node to indicate that its stored Height value will require recomputation the next time getHeight() is called.

setHeightToAtLeast

If NewHeight is greater than this node's height value, set it to be the new height value. This also recursively marks predecessor nodes dirty.

setInstr

Assigns the instruction for the SUnit. This may be used during post‐regalloc scheduling.

setNode

Assigns the representative SDNode for this SUnit. This may be used during pre‐regalloc scheduling.

Name

Description

BotReadyCycle

Cycle relative to end when node is ready.

CopyDstRC

Destination register class for a special copy node, or nullptr.

CopySrcRC

Source register class for a special copy node, or nullptr.

Instr [variant member]

Alternatively, a MachineInstr.

Latency

Node latency.

Node [variant member]

Representative node.

NodeNum

Entry # of node in the node vector.

NodeQueueId

Queue id of node.

NumPreds

# of SDep::Data preds.

NumPredsLeft

# of preds not scheduled.

NumRegDefsLeft

# of reg defs with no scheduled use.

NumSuccs

# of SDep::Data sucss.

NumSuccsLeft

# of succs not scheduled.

OrigNode

If not this, the node from which this node

ParentClusterIdx

The parent cluster id.

Preds

All sunit predecessors.

SchedClass

was cloned. (SD scheduling only)

SchedulingPref

Scheduling preference.

Succs

All sunit successors.

TopReadyCycle

Cycle relative to start when node is ready.

WeakPredsLeft

# of weak preds not scheduled.

WeakSuccsLeft

# of weak succs not scheduled.

hasPhysRegClobbers

Has any physreg defs, used or not.

hasPhysRegDefs

Has physreg defs that are being used.

hasPhysRegUses

Has physreg uses.

hasReservedResource

Uses a reserved resource.

isAvailable

True once available.

isCall

Is a function call.

isCallOp

Is a function call operand.

isCloned

True if this node has been cloned.

isCommutable

Is a commutable instruction.

isPending

True once pending.

isScheduleHigh

True if preferable to schedule high.

isScheduleLow

True if preferable to schedule low.

isScheduled

True once scheduled.

isTwoAddress

Is a two‐address instruction.

isUnbuffered

Uses an unbuffered resource.

isVRegCycle

May use and def the same vreg.

Name

Description

biasPhysReg

Return a bias score for scheduling physreg‐related unit SU.

getWeakLeft

Return the number of unresolved weak edges for SU.

hasLessThanNumFused

Checks if the number of cluster edges between SU and its predecessors is less than FuseLimit.