Thumb2ITBlockPass.cpp File Reference

#include "ARM.h"
#include "ARMMachineFunctionInfo.h"
#include "ARMSubtarget.h"
#include "Thumb2InstrInfo.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineInstrBundle.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/MC/MCInstrDesc.h"
#include <cassert>
#include <new>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "thumb2-it"
#define	PASS_NAME   "Thumb IT blocks insertion pass"

Typedefs
using	RegisterSet = SmallSet< unsigned, 4 >

Functions
	STATISTIC (NumITs, "Number of IT blocks inserted")
	STATISTIC (NumMovedInsts, "Number of predicated instructions moved")
static void	TrackDefUses (MachineInstr *MI, RegisterSet &Defs, RegisterSet &Uses, const TargetRegisterInfo *TRI)
	TrackDefUses - Tracking what registers are being defined and used by instructions in the IT block.
static void	ClearKillFlags (MachineInstr *MI, RegisterSet &Uses)
	Clear kill flags for any uses in the given set.
static bool	isCopy (MachineInstr *MI)

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "thumb2-it"

Definition at line 31 of file Thumb2ITBlockPass.cpp.

PASS_NAME

#define PASS_NAME   "Thumb IT blocks insertion pass"

Definition at line 32 of file Thumb2ITBlockPass.cpp.

Typedef Documentation

RegisterSet

using RegisterSet = SmallSet<unsigned, 4>

Definition at line 37 of file Thumb2ITBlockPass.cpp.

Function Documentation

ClearKillFlags()

static void ClearKillFlags ( MachineInstr *  MI, RegisterSet &  Uses  )

static

Clear kill flags for any uses in the given set.

This will likely conservatively remove more kill flags than are necessary, but removing them is safer than incorrect kill flags remaining on instructions.

Definition at line 110 of file Thumb2ITBlockPass.cpp.

References MI, and Uses.

isCopy()

static bool isCopy ( MachineInstr *  MI )

static

Definition at line 120 of file Thumb2ITBlockPass.cpp.

References MI.

Referenced by findPrologueEndLoc().

STATISTIC() [1/2]

STATISTIC	(	NumITs	,
		"Number of IT blocks inserted"
	)

STATISTIC() [2/2]

STATISTIC	(	NumMovedInsts	,
		"Number of predicated instructions moved"
	)

TrackDefUses()

static void TrackDefUses ( MachineInstr *  MI, RegisterSet &  Defs, RegisterSet &  Uses, const TargetRegisterInfo *  TRI  )

static

TrackDefUses - Tracking what registers are being defined and used by instructions in the IT block.

This also tracks "dependencies", i.e. uses in the IT block that are defined before the IT instruction.

Definition at line 79 of file Thumb2ITBlockPass.cpp.

References MI, TRI, and Uses.