X86EncodingOptimization.cpp File Reference

#include "X86EncodingOptimization.h"
#include "X86BaseInfo.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/Support/Casting.h"
#include "X86EncodingOptimizationForImmediate.def"

Go to the source code of this file.

Macros
#define	FROM_TO(FROM, TO, IDX1, IDX2)
#define	TO_REV(FROM)   FROM_TO(FROM, FROM##_REV, 0, 1)
#define	TO_REV(FROM)   FROM_TO(FROM, FROM##_REV, 0, 2)
#define	TO_IMM1(FROM)
#define	TO_IMM1(FROM)
#define	FROM_TO(FROM, TO1, TO2)
#define	FROM_TO(FROM, TO, R0, R1)
#define	FROM_TO(FROM, TO)
#define	ENTRY(LONG, SHORT)
#define	ENTRY(LONG, SHORT)
#define	ENTRY(LONG, SHORT)

Functions
static bool	isARegister (unsigned Reg)
static bool	optimizeToFixedRegisterForm (MCInst &MI)
	Simplify FOO $imm, %{al,ax,eax,rax} to FOO $imm, for instruction with a short fixed-register form.
static bool	optimizeToShortImmediateForm (MCInst &MI)

Macro Definition Documentation

ENTRY [1/3]

#define ENTRY	(		LONG,
			SHORT
	)

Value:

  case X86::LONG:                                                              \
    return X86::SHORT;

ENTRY [2/3]

#define ENTRY	(		LONG,
			SHORT
	)

Value:

  case X86::SHORT:                                                             \
    return X86::LONG;

ENTRY [3/3]

#define ENTRY	(		LONG,
			SHORT
	)

Value:

  case X86::LONG:                                                              \
    NewOpc = X86::SHORT;                                                       \
    break;

FROM_TO [1/4]

#define FROM_TO	(		FROM,
			TO
	)

Value:

  case X86::FROM:                                                              \
    NewOpc = X86::TO;                                                          \
    break;

FROM_TO [2/4]

#define FROM_TO	(		FROM,
			TO,
			IDX1,
			IDX2
	)

Value:

  case X86::FROM:                                                              \
    NewOpc = X86::TO;                                                          \
    OpIdx1 = IDX1;                                                             \
    OpIdx2 = IDX2;                                                             \
    break;

FROM_TO [3/4]

#define FROM_TO	(		FROM,
			TO,
			R0,
			R1
	)

Value:

  case X86::FROM:                                                              \
    if (MI.getOperand(0).getReg() != X86::R0 ||                                \
        MI.getOperand(1).getReg() != X86::R1)                                  \
      return false;                                                            \
    NewOpc = X86::TO;                                                          \
    break;

FROM_TO [4/4]

#define FROM_TO	(		FROM,
			TO1,
			TO2
	)

Value:

  case X86::FROM:                                                              \
    Opc1 = X86::TO1;                                                           \
    Opc2 = X86::TO2;                                                           \
    break;

TO_IMM1 [1/2]

#define TO_IMM1

(

FROM

)

Value:

  case X86::FROM##i:                                                           \
    NewOpc = X86::FROM##1;                                                     \
    break;                                                                     \
  case X86::FROM##i_EVEX:                                                      \
    NewOpc = X86::FROM##1_EVEX;                                                \
    break;                                                                     \
  case X86::FROM##i_ND:                                                        \
    NewOpc = X86::FROM##1_ND;                                                  \
    break;

TO_IMM1 [2/2]

#define TO_IMM1

(

FROM

)

Value:

  case X86::FROM##i:                                                           \
    NewOpc = X86::FROM##1;                                                     \
    break;                                                                     \
  case X86::FROM##i_EVEX:                                                      \
    NewOpc = X86::FROM##1_EVEX;                                                \
    break;                                                                     \
  case X86::FROM##i_NF:                                                        \
    NewOpc = X86::FROM##1_NF;                                                  \
    break;                                                                     \
  case X86::FROM##i_ND:                                                        \
    NewOpc = X86::FROM##1_ND;                                                  \
    break;                                                                     \
  case X86::FROM##i_NF_ND:                                                     \
    NewOpc = X86::FROM##1_NF_ND;                                               \
    break;

TO_REV [1/2]

#define TO_REV

(

FROM

)

FROM_TO(FROM, FROM##_REV, 0, 1)

TO_REV [2/2]

#define TO_REV

(

FROM

)

FROM_TO(FROM, FROM##_REV, 0, 2)

Function Documentation

isARegister()

static bool isARegister ( unsigned  Reg )

static

Definition at line 332 of file X86EncodingOptimization.cpp.

Referenced by llvm::X86::optimizeMOV(), and optimizeToFixedRegisterForm().

optimizeToFixedRegisterForm()

static bool optimizeToFixedRegisterForm ( MCInst &  MI )

static

Simplify FOO $imm, %{al,ax,eax,rax} to FOO $imm, for instruction with a short fixed-register form.

Definition at line 396 of file X86EncodingOptimization.cpp.

References FROM_TO, isARegister(), MI, and Saved.

Referenced by llvm::X86::optimizeToFixedRegisterOrShortImmediateForm().

optimizeToShortImmediateForm()

static bool optimizeToShortImmediateForm ( MCInst &  MI )

static

Definition at line 473 of file X86EncodingOptimization.cpp.

References llvm::MCOperand::getExpr(), llvm::MCOperand::getImm(), llvm::MCSymbolRefExpr::getKind(), llvm::MCOperand::isExpr(), llvm::MCOperand::isImm(), MI, and llvm::MCSymbolRefExpr::VK_X86_ABS8.

Referenced by llvm::X86::optimizeToFixedRegisterOrShortImmediateForm().