PeepholeOptimizer.cpp File Reference

#include "llvm/CodeGen/Passes.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetRegisterInfo.h"

Include dependency graph for PeepholeOptimizer.cpp:

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "peephole-opt"

Functions
	STATISTIC (NumReuse,"Number of extension results reused")
	STATISTIC (NumCmps,"Number of compares eliminated")
	STATISTIC (NumImmFold,"Number of move immediate folded")
	STATISTIC (NumLoadFold,"Number of loads folded")
	STATISTIC (NumSelects,"Number of selects optimized")
	STATISTIC (NumCopiesBitcasts,"Number of copies/bitcasts optimized")
	INITIALIZE_PASS_BEGIN (PeepholeOptimizer,"peephole-opts","Peephole Optimizations", false, false) INITIALIZE_PASS_END(PeepholeOptimizer
static bool	shareSameRegisterFile (const TargetRegisterInfo &TRI, const TargetRegisterClass *DefRC, unsigned DefSubReg, const TargetRegisterClass *SrcRC, unsigned SrcSubReg)
	Check if the registers defined by the pair (RegisterClass, SubReg) share the same register file. More...
static bool	getCopyOrBitcastDefUseIdx (const MachineInstr &Copy, unsigned &DefIdx, unsigned &SrcIdx)
	Get the index of the definition and source for Copy instruction. More...

Variables
static cl::opt< bool >	Aggressive ("aggressive-ext-opt", cl::Hidden, cl::desc("Aggressive extension optimization"))
static cl::opt< bool >	DisablePeephole ("disable-peephole", cl::Hidden, cl::init(false), cl::desc("Disable the peephole optimizer"))
peephole	opts
peephole Peephole	Optimizations
peephole Peephole	false

Macro Definition Documentation

#define DEBUG_TYPE   "peephole-opt"

Definition at line 69 of file PeepholeOptimizer.cpp.

Function Documentation

static bool getCopyOrBitcastDefUseIdx ( const MachineInstr &  Copy, unsigned &  DefIdx, unsigned &  SrcIdx  )

static

Get the index of the definition and source for Copy instruction.

Precondition

Copy.isCopy() or Copy.isBitcast().

Returns

True if the Copy instruction has only one register source and one register definition. Otherwise, DefIdx and SrcIdx are invalid.

Definition at line 388 of file PeepholeOptimizer.cpp.

References llvm::MachineInstr::getDesc(), llvm::MCInstrDesc::getNumDefs(), llvm::MCInstrDesc::getNumOperands(), llvm::MachineInstr::getOperand(), llvm::MachineOperand::getReg(), llvm::MachineInstr::isBitcast(), llvm::MachineInstr::isCopy(), llvm::MachineOperand::isDef(), and llvm::MachineOperand::isReg().

INITIALIZE_PASS_BEGIN	(	PeepholeOptimizer	,
		"peephole-opts"	,
		"Peephole Optimizations"	,
		false	,
		false
	)

static bool shareSameRegisterFile ( const TargetRegisterInfo &  TRI, const TargetRegisterClass *  DefRC, unsigned  DefSubReg, const TargetRegisterClass *  SrcRC, unsigned  SrcSubReg  )

static

Check if the registers defined by the pair (RegisterClass, SubReg) share the same register file.

Definition at line 354 of file PeepholeOptimizer.cpp.

References llvm::TargetRegisterInfo::getCommonSubClass(), llvm::TargetRegisterInfo::getCommonSuperRegClass(), llvm::TargetRegisterInfo::getMatchingSuperRegClass(), and std::swap().

STATISTIC	(	NumReuse	,
		"Number of extension results reused"
	)

STATISTIC	(	NumCmps	,
		"Number of compares eliminated"
	)

STATISTIC	(	NumImmFold	,
		"Number of move immediate folded"
	)

STATISTIC	(	NumLoadFold	,
		"Number of loads folded"
	)

STATISTIC	(	NumSelects	,
		"Number of selects optimized"
	)

STATISTIC	(	NumCopiesBitcasts	,
		"Number of copies/bitcasts optimized"
	)

Variable Documentation

cl::opt<bool> Aggressive("aggressive-ext-opt", cl::Hidden, cl::desc("Aggressive extension optimization"))

static

cl::opt<bool> DisablePeephole("disable-peephole", cl::Hidden, cl::init(false), cl::desc("Disable the peephole optimizer"))

static

peephole Peephole false

Definition at line 145 of file PeepholeOptimizer.cpp.

peephole Peephole Optimizations

Definition at line 145 of file PeepholeOptimizer.cpp.

peephole opts

Definition at line 145 of file PeepholeOptimizer.cpp.