AArch64BranchRelaxation.cpp File Reference

#include "AArch64.h"
#include "AArch64InstrInfo.h"
#include "AArch64MachineFunctionInfo.h"
#include "AArch64Subtarget.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"

Include dependency graph for AArch64BranchRelaxation.cpp:

Go to the source code of this file.

Defines
#define	DEBUG_TYPE   "aarch64-branch-relax"
Functions
	STATISTIC (NumSplit,"Number of basic blocks split")
	STATISTIC (NumRelaxed,"Number of conditional branches relaxed")
static bool	BBHasFallthrough (MachineBasicBlock *MBB)
static bool	isConditionalBranch (unsigned Opc)
static MachineBasicBlock *	getDestBlock (MachineInstr *MI)
static unsigned	getOppositeConditionOpcode (unsigned Opc)
static unsigned	getBranchDisplacementBits (unsigned Opc)
static void	invertBccCondition (MachineInstr *MI)
Variables
static cl::opt< bool >	BranchRelaxation ("aarch64-branch-relax", cl::Hidden, cl::init(true), cl::desc("Relax out of range conditional branches"))
static cl::opt< unsigned >	TBZDisplacementBits ("aarch64-tbz-offset-bits", cl::Hidden, cl::init(14), cl::desc("Restrict range of TB[N]Z instructions (DEBUG)"))
static cl::opt< unsigned >	CBZDisplacementBits ("aarch64-cbz-offset-bits", cl::Hidden, cl::init(19), cl::desc("Restrict range of CB[N]Z instructions (DEBUG)"))
static cl::opt< unsigned >	BCCDisplacementBits ("aarch64-bcc-offset-bits", cl::Hidden, cl::init(19), cl::desc("Restrict range of Bcc instructions (DEBUG)"))

---

Define Documentation

#define DEBUG_TYPE   "aarch64-branch-relax"

Definition at line 27 of file AArch64BranchRelaxation.cpp.

---

Function Documentation

static bool BBHasFallthrough

(

MachineBasicBlock *

MBB

)

[static]

BBHasFallthrough - Return true if the specified basic block can fallthrough into the block immediately after it.

Definition at line 132 of file AArch64BranchRelaxation.cpp.

References llvm::MachineFunction::end(), llvm::MachineBasicBlock::getParent(), and llvm::MachineBasicBlock::successors().

static unsigned getBranchDisplacementBits

(

unsigned

Opc

)

[static]

Definition at line 326 of file AArch64BranchRelaxation.cpp.

References BCCDisplacementBits, CBZDisplacementBits, llvm_unreachable, and TBZDisplacementBits.

static MachineBasicBlock* getDestBlock

(

MachineInstr *

MI

)

[static]

Definition at line 292 of file AArch64BranchRelaxation.cpp.

References llvm::MachineOperand::getMBB(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), and llvm_unreachable.

static unsigned getOppositeConditionOpcode

(

unsigned

Opc

)

[static]

Definition at line 310 of file AArch64BranchRelaxation.cpp.

References llvm_unreachable.

static void invertBccCondition

(

MachineInstr *

MI

)

[inline, static]

Definition at line 345 of file AArch64BranchRelaxation.cpp.

References llvm::MachineOperand::getImm(), llvm::AArch64CC::getInvertedCondCode(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), and llvm::MachineOperand::setImm().

static bool isConditionalBranch

(

unsigned

Opc

)

[static]

Definition at line 275 of file AArch64BranchRelaxation.cpp.

STATISTIC	(	NumSplit	,
		"Number of basic blocks split"
	)

STATISTIC	(	NumRelaxed	,
		"Number of conditional branches relaxed"
	)

---

Variable Documentation

cl::opt<unsigned> BCCDisplacementBits("aarch64-bcc-offset-bits", cl::Hidden, cl::init(19), cl::desc("Restrict range of Bcc instructions (DEBUG)")) [static]

Referenced by getBranchDisplacementBits().

cl::opt<bool> BranchRelaxation("aarch64-branch-relax", cl::Hidden, cl::init(true), cl::desc("Relax out of range conditional branches")) [static]

cl::opt<unsigned> CBZDisplacementBits("aarch64-cbz-offset-bits", cl::Hidden, cl::init(19), cl::desc("Restrict range of CB[N]Z instructions (DEBUG)")) [static]

Referenced by getBranchDisplacementBits().

cl::opt<unsigned> TBZDisplacementBits("aarch64-tbz-offset-bits", cl::Hidden, cl::init(14), cl::desc("Restrict range of TB[N]Z instructions (DEBUG)")) [static]

Referenced by getBranchDisplacementBits().