모두의 코드
TEST (Intel x86/64 assembly instruction)

작성일 : 2020-09-01 이 글은 74 번 읽혔습니다.

TEST

Logical Compare

참고 사항

아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.

OpcodeInstructionOp/
En
64-Bit
Mode
Compat/
Leg Mode
Description
A8 ibTEST AL imm8IValidValidAND imm8 with AL; set SF, ZF, PF according to result.
A9 iwTEST AX imm16IValidValidAND imm16 with AX; set SF, ZF, PF according to result.
A9 idTEST EAX imm32IValidValidAND imm32 with EAX; set SF, ZF, PF according to result.
REX.W + A9 idTEST RAX imm32IValidN.E.AND imm32 sign-extended to 64-bits with RAX; set SF, ZF, PF according to result.
F6 /0 ibTEST r/m8 imm8MIValidValidAND imm8 with r/m8; set SF, ZF, PF according to result.
REX + F6 /0 ibTEST r/m8* imm8MIValidN.E.AND imm8 with r/m8; set SF, ZF, PF according to result.
F7 /0 iwTEST r/m16 imm16MIValidValidAND imm16 with r/m16; set SF, ZF, PF according to result.
F7 /0 idTEST r/m32 imm32MIValidValidAND imm32 with r/m32; set SF, ZF, PF according to result.
REX.W + F7 /0 idTEST r/m64 imm32MIValidN.E.AND imm32 sign-extended to 64-bits with r/m64; set SF, ZF, PF according to result.
84 /rTEST r/m8 r8MRValidValidAND r8 with r/m8; set SF, ZF, PF according to result.
REX + 84 /rTEST r/m8* r8*MRValidN.E.AND r8 with r/m8; set SF, ZF, PF according to result.
85 /rTEST r/m16 r16MRValidValidAND r16 with r/m16; set SF, ZF, PF according to result.
85 /rTEST r/m32 r32MRValidValidAND r32 with r/m32; set SF, ZF, PF according to result.
REX.W + 85 /rTEST r/m64 r64MRValidN.E.AND r64 with r/m64; set SF, ZF, PF according to result.

* In 64-bit mode, r/m8 can not be encoded to access the following byte registers if a REX prefix is used: AH, BH, CH, DH.

Instruction Operand Encoding

Op/EnOperand 1Operand 2Operand 3Operand 4
IAL/AX/EAX/RAXimm8/16/32NANA
MIModRM:r/m (r)imm8/16/32NANA
MRModRM:r/m (r)ModRM:reg (r)NANA

Description

Computes the bit-wise logical AND of first operand (source 1 operand) and the second operand (source 2 operand) and sets the SF, ZF, and PF status flags according to the result. The result is then discarded.

In 64-bit mode, using a REX prefix in the form of REX.R permits access to additional registers (R8-R15). Using a REX prefix in the form of REX.W promotes operation to 64 bits. See the summary chart at the beginning of this section for encoding data and limits.

Operation

TEMP <- SRC1 AND SRC2;
SF <- MSB(TEMP);
IF TEMP = 0
    THEN ZF <- 1;
    ELSE ZF <- 0;
FI:
PF <- BitwiseXNOR(TEMP[0:7]);
CF <- 0;
OF <- 0;
(* AF is undefined *)

Flags Affected

The OF and CF flags are set to 0. The SF, ZF, and PF flags are set according to the result (see the "Operation" section above). The state of the AF flag is undefined.

Protected Mode Exceptions

#GP(0)

  • If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.

  • If the DS, ES, FS, or GS register contains a NULL segment selector.

#SS(0)

  • If a memory operand effective address is outside the SS segment limit.

#PF(fault-code)

  • If a page fault occurs.

#AC(0)

  • If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.

#UD

  • If the LOCK prefix is used.

Real-Address Mode Exceptions

#GP

  • If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.

#SS

  • If a memory operand effective address is outside the SS segment limit.

#UD

  • If the LOCK prefix is used.

Virtual-8086 Mode Exceptions

#GP(0)

  • If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit.

#SS(0)

  • If a memory operand effective address is outside the SS segment limit.

#PF(fault-code)

  • If a page fault occurs.

#AC(0)

  • If alignment checking is enabled and an unaligned memory reference is made.

#UD

  • If the LOCK prefix is used.

Compatibility Mode Exceptions

Same exceptions as in protected mode.

64-Bit Mode Exceptions

#SS(0)

  • If a memory address referencing the SS segment is in a non-canonical form.

#GP(0)

  • If the memory address is in a non-canonical form.

#PF(fault-code)

  • If a page fault occurs.

#AC(0)

  • If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.

#UD

  • If the LOCK prefix is used.

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