MipsDelaySlotFiller.cpp File Reference

#include "Mips.h"
#include "MipsInstrInfo.h"
#include "MipsSubtarget.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetMachine.h"
#include <cassert>
#include <iterator>
#include <memory>
#include <utility>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "mips-delay-slot-filler"

Enumerations
enum	CompactBranchPolicy { CB_Never , CB_Optimal , CB_Always }

Functions
	STATISTIC (FilledSlots, "Number of delay slots filled")
	STATISTIC (UsefulSlots, "Number of delay slots filled with instructions that" " are not NOP.")
static bool	hasUnoccupiedSlot (const MachineInstr *MI)
	INITIALIZE_PASS (MipsDelaySlotFiller, DEBUG_TYPE, "Fill delay slot for MIPS", false, false) static void insertDelayFiller(Iter Filler
	This function inserts clones of Filler into predecessor blocks.
	for (const auto &I :BrMap)
static void	addLiveInRegs (Iter Filler, MachineBasicBlock &MBB)
	This function adds registers Filler defines to MBB's live-in register list.
static int	getEquivalentCallShort (int Opcode)

Variables
static cl::opt< bool >	DisableDelaySlotFiller ("disable-mips-delay-filler", cl::init(false), cl::desc("Fill all delay slots with NOPs."), cl::Hidden)
static cl::opt< bool >	DisableForwardSearch ("disable-mips-df-forward-search", cl::init(true), cl::desc("Disallow MIPS delay filler to search forward."), cl::Hidden)
static cl::opt< bool >	DisableSuccBBSearch ("disable-mips-df-succbb-search", cl::init(true), cl::desc("Disallow MIPS delay filler to search successor basic blocks."), cl::Hidden)
static cl::opt< bool >	DisableBackwardSearch ("disable-mips-df-backward-search", cl::init(false), cl::desc("Disallow MIPS delay filler to search backward."), cl::Hidden)
static cl::opt< CompactBranchPolicy >	MipsCompactBranchPolicy ("mips-compact-branches", cl::Optional, cl::init(CB_Optimal), cl::desc("MIPS Specific: Compact branch policy."), cl::values(clEnumValN(CB_Never, "never", "Do not use compact branches if possible."), clEnumValN(CB_Optimal, "optimal", "Use compact branches where appropriate (default)."), clEnumValN(CB_Always, "always", "Always use compact branches if possible.")))
const BB2BrMap &	BrMap

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "mips-delay-slot-filler"

Definition at line 50 of file MipsDelaySlotFiller.cpp.

Enumeration Type Documentation

CompactBranchPolicy

enum CompactBranchPolicy

Enumerator
CB_Never	The policy 'never' may in some circumstances or for some ISAs not be absolutely adhered to.
CB_Optimal	Optimal is the default and will produce compact branches when delay slots cannot be filled.
CB_Always	'always' may in some circumstances may not be absolutely adhered to there may not be a corresponding compact form of a branch.

Definition at line 80 of file MipsDelaySlotFiller.cpp.

Function Documentation

addLiveInRegs()

void addLiveInRegs ( Iter Filler, MachineBasicBlock & MBB )

static

This function adds registers Filler defines to MBB's live-in register list.

Definition at line 317 of file MipsDelaySlotFiller.cpp.

References assert(), llvm::TargetRegisterInfo::getAllocatableSet(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::MachineFunction::getSubtarget(), MBB, and llvm::BitVector::test().

for()

for

(

const auto &I :BrMap

)

Definition at line 306 of file MipsDelaySlotFiller.cpp.

References llvm::MIBundleBuilder::append(), BrMap, and I.

getEquivalentCallShort()

int getEquivalentCallShort ( int Opcode )

static

Definition at line 574 of file MipsDelaySlotFiller.cpp.

References llvm_unreachable.

hasUnoccupiedSlot()

bool hasUnoccupiedSlot ( const MachineInstr * MI )

static

Definition at line 295 of file MipsDelaySlotFiller.cpp.

References MI.

INITIALIZE_PASS()

INITIALIZE_PASS	(	MipsDelaySlotFiller	,
		DEBUG_TYPE	,
		"Fill delay slot for MIPS"	,
		false	,
		false	)

This function inserts clones of Filler into predecessor blocks.

References DEBUG_TYPE.

STATISTIC() [1/2]

STATISTIC	(	FilledSlots	,
		"Number of delay slots filled"	)

STATISTIC() [2/2]

STATISTIC	(	UsefulSlots	,
		"Number of delay slots filled with instructions that" " are not NOP."	)

Variable Documentation

BrMap

const BB2BrMap& BrMap

Initial value:

{
  MachineFunction *MF = Filler->getParent()->getParent()

Definition at line 303 of file MipsDelaySlotFiller.cpp.

Referenced by for().

DisableBackwardSearch

cl::opt< bool > DisableBackwardSearch("disable-mips-df-backward-search", cl::init(false), cl::desc("Disallow MIPS delay filler to search backward."), cl::Hidden) ( "disable-mips-df-backward-search" , cl::init(false) , cl::desc("Disallow MIPS delay filler to search backward.") , cl::Hidden  )

static

DisableDelaySlotFiller

cl::opt< bool > DisableDelaySlotFiller("disable-mips-delay-filler", cl::init(false), cl::desc("Fill all delay slots with NOPs."), cl::Hidden) ( "disable-mips-delay-filler" , cl::init(false) , cl::desc("Fill all delay slots with NOPs.") , cl::Hidden  )

static

DisableForwardSearch

cl::opt< bool > DisableForwardSearch("disable-mips-df-forward-search", cl::init(true), cl::desc("Disallow MIPS delay filler to search forward."), cl::Hidden) ( "disable-mips-df-forward-search" , cl::init(true) , cl::desc("Disallow MIPS delay filler to search forward.") , cl::Hidden  )

static

DisableSuccBBSearch

cl::opt< bool > DisableSuccBBSearch("disable-mips-df-succbb-search", cl::init(true), cl::desc("Disallow MIPS delay filler to search successor basic blocks."), cl::Hidden) ( "disable-mips-df-succbb-search" , cl::init(true) , cl::desc("Disallow MIPS delay filler to search successor basic blocks.") , cl::Hidden  )

static

MipsCompactBranchPolicy

cl::opt< CompactBranchPolicy > MipsCompactBranchPolicy("mips-compact-branches", cl::Optional, cl::init(CB_Optimal), cl::desc("MIPS Specific: Compact branch policy."), cl::values(clEnumValN(CB_Never, "never", "Do not use compact branches if possible."), clEnumValN(CB_Optimal, "optimal", "Use compact branches where appropriate (default)."), clEnumValN(CB_Always, "always", "Always use compact branches if possible."))) ( "mips-compact-branches" , cl::Optional , cl::init(CB_Optimal) , cl::desc("MIPS Specific: Compact branch policy.") , cl::values(clEnumValN(CB_Never, "never", "Do not use compact branches if possible."), clEnumValN(CB_Optimal, "optimal", "Use compact branches where appropriate (default)."), clEnumValN(CB_Always, "always", "Always use compact branches if possible."))  )

static