모두의 코드
OR (Intel x86/64 assembly instruction)
OR
Logical Inclusive OR
참고 사항
아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.
Opcode | Instruction | Op/ | 64-Bit | Compat/ | Description |
|---|---|---|---|---|---|
0C ib | OR AL imm8 | I | Valid | Valid | AL OR imm8. |
0D iw | OR AX imm16 | I | Valid | Valid | AX OR imm16. |
0D id | OR EAX imm32 | I | Valid | Valid | EAX OR imm32. |
REX.W + 0D id | OR RAX imm32 | I | Valid | N.E. | RAX OR imm32 (sign-extended). |
80 /1 ib | OR r/m8 imm8 | MI | Valid | Valid | r/m8 OR imm8. |
REX + 80 /1 ib | OR r/m8* imm8 | MI | Valid | N.E. | r/m8 OR imm8. |
81 /1 iw | OR r/m16 imm16 | MI | Valid | Valid | r/m16 OR imm16. |
81 /1 id | OR r/m32 imm32 | MI | Valid | Valid | r/m32 OR imm32. |
REX.W + 81 /1 id | OR r/m64 imm32 | MI | Valid | N.E. | r/m64 OR imm32 (sign-extended). |
83 /1 ib | OR r/m16 imm8 | MI | Valid | Valid | r/m16 OR imm8 (sign-extended). |
83 /1 ib | OR r/m32 imm8 | MI | Valid | Valid | r/m32 OR imm8 (sign-extended). |
REX.W + 83 /1 ib | OR r/m64 imm8 | MI | Valid | N.E. | r/m64 OR imm8 (sign-extended). |
08 /r | OR r/m8 r8 | MR | Valid | Valid | r/m8 OR r8. |
REX + 08 /r | OR r/m8* r8* | MR | Valid | N.E. | r/m8 OR r8. |
09 /r | OR r/m16 r16 | MR | Valid | Valid | r/m16 OR r16. |
09 /r | OR r/m32 r32 | MR | Valid | Valid | r/m32 OR r32. |
REX.W + 09 /r | OR r/m64 r64 | MR | Valid | N.E. | r/m64 OR r64. |
0A /r | OR r8 r/m8 | RM | Valid | Valid | r8 OR r/m8. |
REX + 0A /r | OR r8* r/m8* | RM | Valid | N.E. | r8 OR r/m8. |
0B /r | OR r16 r/m16 | RM | Valid | Valid | r16 OR r/m16. |
0B /r | OR r32 r/m32 | RM | Valid | Valid | r32 OR r/m32. |
REX.W + 0B /r | OR r64 r/m64 | RM | Valid | N.E. | r64 OR r/m64. |
* 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/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|
I | AL/AX/EAX/RAX | imm8/16/32 | NA | NA |
MI | ModRM:r/m (r, w) | imm8/16/32 | NA | NA |
MR | ModRM:r/m (r, w) | ModRM:reg (r) | NA | NA |
RM | ModRM:reg (r, w) | ModRM:r/m (r) | NA | NA |
Description
Performs a bitwise inclusive OR operation between the destination (first) and source (second) operands and stores the result in the destination operand location. The source operand can be an immediate, a register, or a memory location; the destination operand can be a register or a memory location. (However, two memory operands cannot be used in one instruction.) Each bit of the result of the OR instruction is set to 0 if both corresponding bits of the first and second operands are 0; otherwise, each bit is set to 1.
This instruction can be used with a LOCK prefix to allow the instruction to be executed atomically.
In 64-bit mode, the instruction's default operation size is 32 bits. 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
DEST <- DEST OR SRC;
Flags Affected
The OF and CF flags are cleared; the SF, ZF, and PF flags are set according to the result. The state of the AF flag is undefined.
Protected Mode Exceptions
#GP(0)
If the destination operand points to a non-writable segment.
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 but the destination is not a memory operand.
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 but the destination is not a memory operand.
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 but the destination is not a memory operand.
Compatibility Mode Exceptions
Same as for protected mode exceptions.
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 but the destination is not a memory operand.
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