AArch64CodeLayoutOpt.cpp File Reference

#include "AArch64.h"
#include "AArch64InstrInfo.h"
#include "AArch64Subtarget.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "aarch64-code-layout-opt"
#define	DBG(...)
#define	AARCH64_CODE_LAYOUT_OPT_NAME   "AArch64 Code Layout Optimization"

Enumerations
enum	CodeLayoutOpt { CmpCsel , FcmpFcsel }

Functions
	STATISTIC (NumFunctionsAligned, "Number of functions with aligned (to 64-bytes by default)")
	STATISTIC (NumCmpCselPairsDetected, "Number of CMP/CMN-CSEL pairs detected for alignment")
	STATISTIC (NumFcmpFcselPairsDetected, "Number of FCMP-FCSEL pairs detected for alignment")
	INITIALIZE_PASS (AArch64CodeLayoutOpt, "aarch64-code-layout-opt", AARCH64_CODE_LAYOUT_OPT_NAME, false, false) void AArch64CodeLayoutOpt
static bool	isFloatingPointCompare (unsigned Opc)
static bool	isFloatingPointConditionalSelect (unsigned Opc)
static bool	isQualifyingIntCompare (const MachineInstr &MI)

Variables
static cl::bits< CodeLayoutOpt >	EnableCodeAlignment ("aarch64-code-layout-opt-enable", cl::Hidden, cl::CommaSeparated, cl::desc("Enable code alignment optimization for instruction pairs"), cl::values(clEnumValN(CmpCsel, "cmp-csel", "CMP/CMN-CSEL pair alignment (32-bit)"), clEnumValN(FcmpFcsel, "fcmp-fcsel", "FCMP-FCSEL pair alignment")))
static cl::opt< unsigned >	FunctionAlignBytes ("aarch64-code-layout-opt-align-functions", cl::Hidden, cl::desc("Function alignment in bytes for code layout optimization " "(must be a power of 2)"), cl::init(64), cl::callback([](const unsigned &Val) { if(!isPowerOf2_32(Val)) report_fatal_error("aarch64-code-layout-opt-align must be a power of 2");}))

Macro Definition Documentation

AARCH64_CODE_LAYOUT_OPT_NAME

#define AARCH64_CODE_LAYOUT_OPT_NAME   "AArch64 Code Layout Optimization"

Definition at line 37 of file AArch64CodeLayoutOpt.cpp.

Referenced by INITIALIZE_PASS().

DBG

#define DBG

(

...

)

Value:

LLVM_DEBUG(dbgs() << DEBUG_TYPE ": " << __VA_ARGS__)

Definition at line 36 of file AArch64CodeLayoutOpt.cpp.

DEBUG_TYPE

#define DEBUG_TYPE   "aarch64-code-layout-opt"

Definition at line 35 of file AArch64CodeLayoutOpt.cpp.

Enumeration Type Documentation

CodeLayoutOpt

enum CodeLayoutOpt

Enumerator
CmpCsel
FcmpFcsel

Definition at line 39 of file AArch64CodeLayoutOpt.cpp.

Function Documentation

INITIALIZE_PASS()

INITIALIZE_PASS	(	AArch64CodeLayoutOpt	,
		"aarch64-code-layout-opt"	,
		AARCH64_CODE_LAYOUT_OPT_NAME	,
		false	,
		false	)

Definition at line 99 of file AArch64CodeLayoutOpt.cpp.

References AARCH64_CODE_LAYOUT_OPT_NAME, and llvm::MachineFunctionPass::getAnalysisUsage().

isFloatingPointCompare()

bool isFloatingPointCompare ( unsigned Opc )

static

Returns

true iff Opc is a floating-point comparison (FCMP/FCMPE).

Definition at line 112 of file AArch64CodeLayoutOpt.cpp.

References Opc.

isFloatingPointConditionalSelect()

bool isFloatingPointConditionalSelect ( unsigned Opc )

static

Returns

true iff Opc is a floating-point conditional select (FCSEL).

Definition at line 127 of file AArch64CodeLayoutOpt.cpp.

References Opc.

isQualifyingIntCompare()

bool isQualifyingIntCompare ( const MachineInstr & MI )

static

Returns

true if MI is a qualifying 32-bit CMP or CMN instruction. CMP is encoded as SUBS with WZR destination, CMN as ADDS with WZR. Only simple variants (no shifted/extended reg) qualify, and immediate variants require no LSL shift and small immediates (<=15).

Definition at line 142 of file AArch64CodeLayoutOpt.cpp.

References MI.

STATISTIC() [1/3]

STATISTIC	(	NumCmpCselPairsDetected	,
		"Number of CMP/CMN-CSEL pairs detected for alignment"	)

STATISTIC() [2/3]

STATISTIC	(	NumFcmpFcselPairsDetected	,
		"Number of FCMP-FCSEL pairs detected for alignment"	)

STATISTIC() [3/3]

STATISTIC	(	NumFunctionsAligned	,
		"Number of functions with aligned (to 64-bytes by default)"	)

Variable Documentation

EnableCodeAlignment

cl::bits< CodeLayoutOpt > EnableCodeAlignment("aarch64-code-layout-opt-enable", cl::Hidden, cl::CommaSeparated, cl::desc("Enable code alignment optimization for instruction pairs"), cl::values( clEnumValN(CmpCsel, "cmp-csel", "CMP/CMN-CSEL pair alignment (32-bit)"), clEnumValN(FcmpFcsel, "fcmp-fcsel", "FCMP-FCSEL pair alignment"))) ( "aarch64-code-layout-opt-enable" , cl::Hidden , cl::CommaSeparated , cl::desc("Enable code alignment optimization for instruction pairs") , cl::values( clEnumValN(CmpCsel, "cmp-csel", "CMP/CMN-CSEL pair alignment (32-bit)"), clEnumValN(FcmpFcsel, "fcmp-fcsel", "FCMP-FCSEL pair alignment"))  )

static

FunctionAlignBytes

cl::opt< unsigned > FunctionAlignBytes("aarch64-code-layout-opt-align-functions", cl::Hidden, cl::desc("Function alignment in bytes for code layout optimization " "(must be a power of 2)"), cl::init(64), cl::callback([](const unsigned &Val) { if(!isPowerOf2_32(Val)) report_fatal_error( "aarch64-code-layout-opt-align must be a power of 2"); })) ( "aarch64-code-layout-opt-align-functions" , cl::Hidden , cl::desc("Function alignment in bytes for code layout optimization " "(must be a power of 2)") , cl::init(64) , cl::callback([](const unsigned &Val) { if(!isPowerOf2_32(Val)) report_fatal_error( "aarch64-code-layout-opt-align must be a power of 2"); })  )

static