MachineCopyPropagation.cpp File Reference

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/InitializePasses.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/DebugCounter.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <iterator>

Include dependency graph for MachineCopyPropagation.cpp:

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "machine-cp"

Functions
	STATISTIC (NumDeletes, "Number of dead copies deleted")
	STATISTIC (NumCopyForwards, "Number of copy uses forwarded")
	STATISTIC (NumCopyBackwardPropagated, "Number of copy defs backward propagated")
	DEBUG_COUNTER (FwdCounter, "machine-cp-fwd", "Controls which register COPYs are forwarded")
	INITIALIZE_PASS (MachineCopyPropagation, DEBUG_TYPE, "Machine Copy Propagation Pass", false, false) void MachineCopyPropagation
static bool	isNopCopy (const MachineInstr &PreviousCopy, MCRegister Src, MCRegister Def, const TargetRegisterInfo *TRI, const TargetInstrInfo *TII, bool UseCopyInstr)
	Return true if PreviousCopy did copy register Src to register Def. More...
static bool	isBackwardPropagatableCopy (MachineInstr &MI, const MachineRegisterInfo &MRI, const TargetInstrInfo &TII, bool UseCopyInstr)

Variables
static cl::opt< bool >	MCPUseCopyInstr ("mcp-use-is-copy-instr", cl::init(false), cl::Hidden)

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "machine-cp"

Definition at line 78 of file MachineCopyPropagation.cpp.

Function Documentation

DEBUG_COUNTER()

DEBUG_COUNTER	(	FwdCounter	,
		"machine-cp-fwd"	,
		"Controls which register COPYs are forwarded"
	)

INITIALIZE_PASS()

INITIALIZE_PASS	(	MachineCopyPropagation	,
		DEBUG_TYPE	,
		"Machine Copy Propagation Pass"	,
		false	,
		false
	)

Definition at line 356 of file MachineCopyPropagation.cpp.

References llvm::dbgs(), llvm::MCRegisterInfo::DiffListIterator::isValid(), LLVM_DEBUG, and TRI.

isBackwardPropagatableCopy()

static bool isBackwardPropagatableCopy ( MachineInstr &  MI, const MachineRegisterInfo &  MRI, const TargetInstrInfo &  TII, bool  UseCopyInstr  )

static

Definition at line 844 of file MachineCopyPropagation.cpp.

References assert(), llvm::tgtok::Def, llvm::DestSourcePair::Destination, llvm::MachineOperand::getReg(), llvm::MachineOperand::isKill(), llvm::MachineOperand::isRenamable(), llvm::MachineRegisterInfo::isReserved(), MI, MRI, llvm::DestSourcePair::Source, and TII.

isNopCopy()

static bool isNopCopy ( const MachineInstr &  PreviousCopy, MCRegister  Src, MCRegister  Def, const TargetRegisterInfo *  TRI, const TargetInstrInfo *  TII, bool  UseCopyInstr  )

static

Return true if PreviousCopy did copy register Src to register Def.

This fact may have been obscured by sub register usage or may not be true at all even though Src and Def are subregisters of the registers used in PreviousCopy. e.g. isNopCopy("ecx = COPY eax", AX, CX) == true isNopCopy("ecx = COPY eax", AH, CL) == false

Definition at line 382 of file MachineCopyPropagation.cpp.

References llvm::Register::asMCReg(), llvm::tgtok::Def, llvm::DestSourcePair::Destination, llvm::MachineOperand::getReg(), llvm::MCRegisterInfo::getSubRegIndex(), llvm::MCRegisterInfo::isSubRegister(), llvm::DestSourcePair::Source, TII, and TRI.

STATISTIC() [1/3]

STATISTIC	(	NumCopyBackwardPropagated	,
		"Number of copy defs backward propagated"
	)

STATISTIC() [2/3]

STATISTIC	(	NumCopyForwards	,
		"Number of copy uses forwarded"
	)

STATISTIC() [3/3]

STATISTIC	(	NumDeletes	,
		"Number of dead copies deleted"
	)

Variable Documentation

MCPUseCopyInstr

cl::opt<bool> MCPUseCopyInstr("mcp-use-is-copy-instr", cl::init(false), cl::Hidden)

static