llvm::MachineTraceMetrics::Trace Class Reference

#include <MachineTraceMetrics.h>

Public Member Functions
	Trace (Ensemble &te, TraceBlockInfo &tbi)
void	print (raw_ostream &) const
unsigned	getInstrCount () const
	Compute the total number of instructions in the trace. More...
unsigned	getResourceDepth (bool Bottom) const
unsigned	getResourceLength (ArrayRef< const MachineBasicBlock * > Extrablocks=None, ArrayRef< const MCSchedClassDesc * > ExtraInstrs=None) const
unsigned	getCriticalPath () const
InstrCycles	getInstrCycles (const MachineInstr *MI) const
unsigned	getInstrSlack (const MachineInstr *MI) const
unsigned	getPHIDepth (const MachineInstr *PHI) const

Detailed Description

A trace represents a plausible sequence of executed basic blocks that passes through the current basic block one. The Trace class serves as a handle to internal cached data structures.

Definition at line 236 of file MachineTraceMetrics.h.

Constructor & Destructor Documentation

llvm::MachineTraceMetrics::Trace::Trace ( Ensemble &  te, TraceBlockInfo &  tbi  )

inlineexplicit

Definition at line 243 of file MachineTraceMetrics.h.

Member Function Documentation

unsigned llvm::MachineTraceMetrics::Trace::getCriticalPath ( ) const

inline

Return the length of the (data dependency) critical path through the trace.

Definition at line 272 of file MachineTraceMetrics.h.

References llvm::MachineTraceMetrics::TraceBlockInfo::CriticalPath.

unsigned llvm::MachineTraceMetrics::Trace::getInstrCount ( ) const

inline

Compute the total number of instructions in the trace.

Definition at line 247 of file MachineTraceMetrics.h.

References llvm::MachineTraceMetrics::TraceBlockInfo::InstrDepth, and llvm::MachineTraceMetrics::TraceBlockInfo::InstrHeight.

InstrCycles llvm::MachineTraceMetrics::Trace::getInstrCycles ( const MachineInstr *  MI ) const

inline

Return the depth and height of MI. The depth is only valid for instructions in or above the trace center block. The height is only valid for instructions in or below the trace center block.

Definition at line 277 of file MachineTraceMetrics.h.

unsigned MachineTraceMetrics::Trace::getInstrSlack

(

const MachineInstr *

MI

)

const

Return the slack of MI. This is the number of cycles MI can be delayed before the critical path becomes longer. MI must be an instruction in the trace center block.

Definition at line 1153 of file MachineTraceMetrics.cpp.

References llvm::MachineTraceMetrics::InstrCycles::Depth, getBlockNum(), llvm::MachineBasicBlock::getNumber(), llvm::MachineInstr::getParent(), and llvm::MachineTraceMetrics::InstrCycles::Height.

unsigned MachineTraceMetrics::Trace::getPHIDepth

(

const MachineInstr *

PHI

)

const

Return the Depth of a PHI instruction in a trace center block successor. The PHI does not have to be part of the trace.

Definition at line 1162 of file MachineTraceMetrics.cpp.

References llvm::SmallVectorTemplateCommon< T >::front(), getBlockNum(), getPHIDeps(), and llvm::SmallVectorTemplateCommon< T >::size().

unsigned MachineTraceMetrics::Trace::getResourceDepth

(

bool

Bottom

)

const

Return the resource depth of the top/bottom of the trace center block. This is the number of cycles required to execute all instructions from the trace head to the trace center block. The resource depth only considers execution resources, it ignores data dependencies. When Bottom is set, instructions in the trace center block are included.

Definition at line 1176 of file MachineTraceMetrics.cpp.

References getBlockNum(), and llvm::ArrayRef< T >::size().

unsigned MachineTraceMetrics::Trace::getResourceLength	(	ArrayRef< const MachineBasicBlock * >	Extrablocks = None,
		ArrayRef< const MCSchedClassDesc * >	ExtraInstrs = None
	)		const

Return the resource length of the trace. This is the number of cycles required to execute the instructions in the trace if they were all independent, exposing the maximum instruction-level parallelism.

Any blocks in Extrablocks are included as if they were part of the trace. Likewise, extra resources required by the specified scheduling classes are included. For the caller to account for extra machine instructions, it must first resolve each instruction's scheduling class.

Definition at line 1203 of file MachineTraceMetrics.cpp.

References getBlockNum(), I, llvm::MCSchedClassDesc::isValid(), llvm::PPCISD::SC, and llvm::ArrayRef< T >::size().

void MachineTraceMetrics::Trace::print

(

raw_ostream &

OS

)

const

Definition at line 1276 of file MachineTraceMetrics.cpp.

References llvm::MachineBasicBlock::getNumber(), llvm::MachineTraceMetrics::TraceBlockInfo::hasValidDepth(), llvm::MachineTraceMetrics::TraceBlockInfo::hasValidHeight(), llvm::MachineTraceMetrics::TraceBlockInfo::Pred, and llvm::MachineTraceMetrics::TraceBlockInfo::Succ.

Referenced by llvm::operator<<().

---

The documentation for this class was generated from the following files:

• MachineTraceMetrics.h
• MachineTraceMetrics.cpp