AMD 4.4.5 user manual 195

AMD Confidential

November 21st, 2008

User Manual

Instruction

Supported

Mnemonic

Opcode

Description

Compare

the

contents

of

an

8-bit

CMP reg/mem8,reg8

38

/r

register

or memory operand with the

contents of an 8-bit register.

Compare

the

contents

of

a

16-bit

CMP reg/mem16,reg16

39

/r

register

or memory operand with the

contents of a 16-bit register.

Compare

the

contents

of

a

32-bit

CMP reg/mem32,reg32

39

/r

register

or memory operand with the

contents of a 32-bit register.

Compare

the

contents

of

a

64-bit

CMP reg/mem64,reg64

39

/r

register

or memory operand with the

contents of a 64-bit register.

Compare

the

contents of an 8-bit

CMP reg8,reg/mem8

3A

/r

register

with the contents of an 8-

bit register or memory operand.

Compare

the

contents of a 16-bit

CMP reg16,reg/mem16

3B

/r

register

with the contents of a 16-

bit register or memory operand.

Compare

the

contents of a 32-bit

CMP reg32,reg/mem32

3B

/r

register

with the contents of a 32-

bit register or memory operand.

Compare

the

contents of a 64-bit

CMP reg64,reg/mem64

3B

/r

register

with the contents of a 64-

bit register or memory operand.

Compare the byte at DS:rSI with the

CMPS mem8,mem8

A6

byte

at

ES:rDI and then increment or

decrement rSI and rDI.

Compare the word at DS:rSI with the

CMPS mem16,mem16

A7

word

at

ES:rDI and then increment or

decrement rSI and rDI.

Compare the doubleword at DS:rSI with

CMPS mem32,mem32

A7

the

doubleword

at

ES:rDI

and

then

increment or decrement rSI and rDI.

Compare the quadword at DS:rSI with

CMPS mem64,mem64

A7

the

quadword

at

ES:rDI

and

then

increment or decrement rSI and rDI.

Compare the byte at DS:rSI with the

CMPSB

A6

byte

at

ES:rDI and then increment or

decrement rSI and rDI.

Compare the word at DS:rSI with the

CMPSW

A7

word

at

ES:rDI and then increment or

decrement rSI and rDI.

Compare the doubleword at DS:rSI with

CMPSD

A7

the

doubleword

at

ES:rDI

and

then

increment or decrement rSI and rDI.

Compare the quadword at DS:rSI with

CMPSQ

A7

the

quadword

at

ES:rDI

and

then

increment or decrement rSI and rDI.

Compare AL register with an 8-bit

register

or

memory

location.

If

CMPXCHG reg/mem8,reg8

0F

B0 /r

equal, copy the second operand to the

first operand. Otherwise, copy the

first operand to AL.

Compare AX register with a 16-bit

register

or

memory

location.

If

CMPXCHG reg/mem16,reg16

0F

B1 /r

equal, copy the second operand to the

first operand. Otherwise, copy the

first operand to AX.

Compare EAX register with a 32-bit

register

or

memory

location.

If

CMPXCHG reg/mem32,reg32

0F

B1 /r

equal, copy the second operand to the

first operand. Otherwise, copy the

first operand to EAX.

Compare RAX register with a 64-bit

register

or

memory

location.

If

CMPXCHG reg/mem64,reg64

0F

B1 /r

equal, copy the second operand to the

first operand. Otherwise, copy the

first operand to RAX.

Appendix A 195