class MachinePipeliner

Declaration

class MachinePipeliner : public MachineFunctionPass { /* full declaration omitted */ };

Description

The main class in the implementation of the target independent software pipeliner pass.

Declared at: llvm/include/llvm/CodeGen/MachinePipeliner.h:64

Inherits from: MachineFunctionPass

Member Variables

public llvm::MachineFunction* MF = nullptr

public llvm::MachineOptimizationRemarkEmitter* ORE = nullptr

public const llvm::MachineLoopInfo* MLI = nullptr

public const llvm::MachineDominatorTree* MDT = nullptr

public const llvm::InstrItineraryData* InstrItins

public const llvm::TargetInstrInfo* TII = nullptr

public llvm::RegisterClassInfo RegClassInfo

public bool disabledByPragma = false

public unsigned int II_setByPragma = 0

public llvm::MachinePipeliner::LoopInfo LI

public static int NumTries

public static char ID

Method Overview

• public MachinePipeliner()
• private bool canPipelineLoop(llvm::MachineLoop & L)
• public void getAnalysisUsage(llvm::AnalysisUsage & AU) const
• private void preprocessPhiNodes(llvm::MachineBasicBlock & B)
• public bool runOnMachineFunction(llvm::MachineFunction & MF)
• private bool scheduleLoop(llvm::MachineLoop & L)
• private void setPragmaPipelineOptions(llvm::MachineLoop & L)
• private bool swingModuloScheduler(llvm::MachineLoop & L)

Inherited from MachineFunctionPass:

• public doInitialization
• protected getAnalysisUsage
• protected getClearedProperties
• protected getRequiredProperties
• protected getSetProperties
• protected runOnMachineFunction

Inherited from FunctionPass:

• public assignPassManager
• public createPrinterPass
• public getPotentialPassManagerType
• public runOnFunction
• protected skipFunction

Inherited from Pass:

• public assignPassManager
• public createPass
• public createPrinterPass
• public doFinalization
• public doInitialization
• public dump
• public dumpPassStructure
• public getAdjustedAnalysisPointer
• public getAnalysis
• public getAnalysis
• public getAnalysisID
• public getAnalysisID
• public getAnalysisIfAvailable
• public getAnalysisUsage
• public getAsImmutablePass
• public getAsPMDataManager
• public getPassID
• public getPassKind
• public getPassName
• public getPotentialPassManagerType
• public getResolver
• public lookupPassInfo
• public lookupPassInfo
• public mustPreserveAnalysisID
• public preparePassManager
• public print
• public releaseMemory
• public setResolver
• public verifyAnalysis

Methods

¶MachinePipeliner()

Declared at: llvm/include/llvm/CodeGen/MachinePipeliner.h:94

¶bool canPipelineLoop(llvm::MachineLoop& L)

Description

Return true if the loop can be software pipelined. The algorithm is restricted to loops with a single basic block. Make sure that the branch in the loop can be analyzed.

Declared at: llvm/include/llvm/CodeGen/MachinePipeliner.h:104

Parameters

llvm::MachineLoop& L

¶void getAnalysisUsage(
    llvm::AnalysisUsage& AU) const

Description

getAnalysisUsage - Subclasses that override getAnalysisUsage must call this. For MachineFunctionPasses, calling AU.preservesCFG() indicates that the pass does not modify the MachineBasicBlock CFG.

Declared at: llvm/include/llvm/CodeGen/MachinePipeliner.h:100

Parameters

llvm::AnalysisUsage& AU

¶void preprocessPhiNodes(
    llvm::MachineBasicBlock& B)

Declared at: llvm/include/llvm/CodeGen/MachinePipeliner.h:103

Parameters

llvm::MachineBasicBlock& B

¶bool runOnMachineFunction(
    llvm::MachineFunction& MF)

Description

The "main" function for implementing Swing Modulo Scheduling.

Declared at: llvm/include/llvm/CodeGen/MachinePipeliner.h:98

Parameters

llvm::MachineFunction& MF

¶bool scheduleLoop(llvm::MachineLoop& L)

Description

Attempt to perform the SMS algorithm on the specified loop. This function is the main entry point for the algorithm. The function identifies candidate loops, calculates the minimum initiation interval, and attempts to schedule the loop.

Declared at: llvm/include/llvm/CodeGen/MachinePipeliner.h:105

Parameters

llvm::MachineLoop& L

¶void setPragmaPipelineOptions(
    llvm::MachineLoop& L)

Declared at: llvm/include/llvm/CodeGen/MachinePipeliner.h:107

Parameters

llvm::MachineLoop& L

¶bool swingModuloScheduler(llvm::MachineLoop& L)

Description

The SMS algorithm consists of the following main steps: 1. Computation and analysis of the dependence graph. 2. Ordering of the nodes (instructions). 3. Attempt to Schedule the loop.

Declared at: llvm/include/llvm/CodeGen/MachinePipeliner.h:106

Parameters

llvm::MachineLoop& L