Additional information about basic blocks where the current variable is live. More...

#include "CodeGen/SplitKit.h"

Public Member Functions
bool	isOneInstr () const
	isOneInstr - Returns true when this BlockInfo describes a single instruction.

void	print (raw_ostream &OS) const

void	dump () const

Public Attributes
MachineBasicBlock *	MBB

SlotIndex	FirstInstr
	First instr accessing current reg.

SlotIndex	LastInstr
	Last instr accessing current reg.

SlotIndex	FirstDef
	First non-phi valno->def, or SlotIndex().

bool	LiveIn
	Current reg is live in.

bool	LiveOut
	Current reg is live out.

Detailed Description

Additional information about basic blocks where the current variable is live.

Such a block will look like one of these templates:

| o—x | Internal to block. Variable is only live in this block.
|—x | Live-in, kill.
| o—| Def, live-out.
|—x o—| Live-in, kill, def, live-out. Counted by NumGapBlocks.
|—o—o—| Live-through with uses or defs.
|--------—| Live-through without uses. Counted by NumThroughBlocks.

Two BlockInfo entries are created for template 4. One for the live-in segment, and one for the live-out segment. These entries look as if the block were split in the middle where the live range isn't live.

Live-through blocks without any uses don't get BlockInfo entries. They are simply listed in ThroughBlocks instead.

Definition at line 121 of file SplitKit.h.

Member Function Documentation

◆ dump()

void SplitAnalysis::BlockInfo::dump ( ) const

Definition at line 1899 of file SplitKit.cpp.

References llvm::dbgs(), and llvm::print().

◆ isOneInstr()

bool llvm::SplitAnalysis::BlockInfo::isOneInstr ( ) const

inline

isOneInstr - Returns true when this BlockInfo describes a single instruction.

Definition at line 131 of file SplitKit.h.

Referenced by llvm::SplitAnalysis::shouldSplitSingleBlock().

◆ print()

void SplitAnalysis::BlockInfo::print ( raw_ostream & OS ) const

Definition at line 1891 of file SplitKit.cpp.

References FirstDef, FirstInstr, LastInstr, LiveIn, LiveOut, MBB, OS, and llvm::printMBBReference().

Member Data Documentation

◆ FirstDef

SlotIndex llvm::SplitAnalysis::BlockInfo::FirstDef

First non-phi valno->def, or SlotIndex().

Definition at line 125 of file SplitKit.h.

Referenced by print().

◆ FirstInstr

SlotIndex llvm::SplitAnalysis::BlockInfo::FirstInstr

First instr accessing current reg.

Definition at line 123 of file SplitKit.h.

Referenced by print(), llvm::SplitAnalysis::shouldSplitSingleBlock(), llvm::SplitEditor::splitRegInBlock(), llvm::SplitEditor::splitRegOutBlock(), and llvm::SplitEditor::splitSingleBlock().

◆ LastInstr

SlotIndex llvm::SplitAnalysis::BlockInfo::LastInstr

Last instr accessing current reg.

Definition at line 124 of file SplitKit.h.

Referenced by print(), llvm::SplitEditor::splitRegInBlock(), llvm::SplitEditor::splitRegOutBlock(), and llvm::SplitEditor::splitSingleBlock().

◆ LiveIn

bool llvm::SplitAnalysis::BlockInfo::LiveIn

Current reg is live in.

Definition at line 126 of file SplitKit.h.

Referenced by print(), llvm::SplitAnalysis::shouldSplitSingleBlock(), llvm::SplitEditor::splitRegInBlock(), and llvm::SplitEditor::splitRegOutBlock().

◆ LiveOut

bool llvm::SplitAnalysis::BlockInfo::LiveOut

Current reg is live out.

Definition at line 127 of file SplitKit.h.