ARMConstantIslandPass.cpp File Reference (original) (raw)

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Macros
#define	DEBUG_TYPE "arm-cp-islands"
#define	ARM_CP_ISLANDS_OPT_NAME "ARM constant island placement and branch shortening pass"

Functions
	STATISTIC (NumCPEs, "Number of constpool entries")
	STATISTIC (NumSplit, "Number of uncond branches inserted")
	STATISTIC (NumCBrFixed, "Number of cond branches fixed")
	STATISTIC (NumUBrFixed, "Number of uncond branches fixed")
	STATISTIC (NumTBs, "Number of table branches generated")
	STATISTIC (NumT2CPShrunk, "Number of Thumb2 constantpool instructions shrunk")
	STATISTIC (NumT2BrShrunk, "Number of Thumb2 immediate branches shrunk")
	STATISTIC (NumCBZ, "Number of CBZ / CBNZ formed")
	STATISTIC (NumJTMoved, "Number of jump table destination blocks moved")
	STATISTIC (NumJTInserted, "Number of jump table intermediate blocks inserted")
	STATISTIC (NumLEInserted, "Number of LE backwards branches inserted")
static bool	AlignBlocks (MachineFunction MF, const ARMSubtarget STI)
static bool	CompareMBBNumbers (const MachineBasicBlock LHS, const MachineBasicBlock RHS)
	CompareMBBNumbers - Little predicate function to sort the WaterList by MBB ID.
static bool	BBIsJumpedOver (MachineBasicBlock *MBB)
	BBIsJumpedOver - Return true of the specified basic block's only predecessor unconditionally branches to its only successor.
static unsigned	getUnconditionalBrDisp (int Opc)
	getUnconditionalBrDisp - Returns the maximum displacement that can fit in the specific unconditional branch instruction.
static bool	isSimpleIndexCalc (MachineInstr &I, unsigned EntryReg, unsigned BaseReg)
static bool	jumpTableFollowsTB (MachineInstr JTMI, MachineInstr CPEMI)
	Returns whether CPEMI is the first instruction in the block immediately following JTMI (assumed to be a TBB or TBH terminator).
static void	RemoveDeadAddBetweenLEAAndJT (MachineInstr LEAMI, MachineInstr JumpMI, unsigned &DeadSize)

Variables
static cl::opt< bool >	AdjustJumpTableBlocks ("arm-adjust-jump-tables", cl::Hidden, cl::init(true), cl::desc("Adjust basic block layout to better use TB[BH]"))
static cl::opt< unsigned >	CPMaxIteration ("arm-constant-island-max-iteration", cl::Hidden, cl::init(30), cl::desc("The max number of iteration for converge"))
static cl::opt< bool >	SynthesizeThumb1TBB ("arm-synthesize-thumb-1-tbb", cl::Hidden, cl::init(true), cl::desc("Use compressed jump tables in Thumb-1 by synthesizing an " "equivalent to the TBB/TBH instructions"))

◆ ARM_CP_ISLANDS_OPT_NAME

#define ARM_CP_ISLANDS_OPT_NAME "ARM constant island placement and branch shortening pass"

◆ DEBUG_TYPE

#define DEBUG_TYPE "arm-cp-islands"

◆ AlignBlocks()

Definition at line 341 of file ARMConstantIslandPass.cpp.

References llvm::Aggressive, Changed, llvm::MachineFunction::getFunction(), llvm::TargetMachine::getOptLevel(), llvm::MachineFunction::getTarget(), llvm::ARMSubtarget::getTargetLowering(), llvm::Function::hasOptSize(), llvm::isLoopStart(), MBB, MI, and llvm::reverse().

◆ BBIsJumpedOver()

◆ CompareMBBNumbers()

◆ getUnconditionalBrDisp()

unsigned getUnconditionalBrDisp ( int Opc)	inlinestatic

getUnconditionalBrDisp - Returns the maximum displacement that can fit in the specific unconditional branch instruction.

Definition at line 1259 of file ARMConstantIslandPass.cpp.

References Opc.

◆ isSimpleIndexCalc()

◆ jumpTableFollowsTB()

◆ RemoveDeadAddBetweenLEAAndJT()

◆ STATISTIC() [1/11]

STATISTIC	(	NumCBrFixed	,
"Number of cond branches fixed"	)

◆ STATISTIC() [2/11]

STATISTIC	(	NumCBZ	,
"Number of CBZ / CBNZ formed"	)

◆ STATISTIC() [3/11]

STATISTIC	(	NumCPEs	,
"Number of constpool entries"	)

◆ STATISTIC() [4/11]

STATISTIC	(	NumJTInserted	,
"Number of jump table intermediate blocks inserted"	)

◆ STATISTIC() [5/11]

STATISTIC	(	NumJTMoved	,
"Number of jump table destination blocks moved"	)

◆ STATISTIC() [6/11]

STATISTIC	(	NumLEInserted	,
"Number of LE backwards branches inserted"	)

◆ STATISTIC() [7/11]

STATISTIC	(	NumSplit	,
"Number of uncond branches inserted"	)

◆ STATISTIC() [8/11]

STATISTIC	(	NumT2BrShrunk	,
"Number of Thumb2 immediate branches shrunk"	)

◆ STATISTIC() [9/11]

STATISTIC	(	NumT2CPShrunk	,
"Number of Thumb2 constantpool instructions shrunk"	)

◆ STATISTIC() [10/11]

STATISTIC	(	NumTBs	,
"Number of table branches generated"	)

◆ STATISTIC() [11/11]

STATISTIC	(	NumUBrFixed	,
"Number of uncond branches fixed"	)

◆ AdjustJumpTableBlocks

cl::opt< bool > AdjustJumpTableBlocks("arm-adjust-jump-tables", cl::Hidden, cl::init(true), cl::desc("Adjust basic block layout to better use TB[BH]")) ( "arm-adjust-jump-tables" , cl::Hidden , cl::init(true) , cl::desc("Adjust basic block layout to better use TB[BH]") )	static

◆ CPMaxIteration

cl::opt< unsigned > CPMaxIteration("arm-constant-island-max-iteration", cl::Hidden, cl::init(30), cl::desc("The max number of iteration for converge")) ( "arm-constant-island-max-iteration" , cl::Hidden , cl::init(30) , cl::desc("The max number of iteration for converge") )	static

◆ SynthesizeThumb1TBB

cl::opt< bool > SynthesizeThumb1TBB("arm-synthesize-thumb-1-tbb", cl::Hidden, cl::init(true), cl::desc("Use compressed jump tables in Thumb-1 by synthesizing an " "equivalent to the TBB/TBH instructions")) ( "arm-synthesize-thumb-1-tbb" , cl::Hidden , cl::init(true) , cl::desc("Use compressed jump tables in Thumb-1 by synthesizing an " "equivalent to the TBB/TBH instructions") )	static