모두의 코드
FNOP (Intel x86/64 assembly instruction)
작성일 : 2020-09-01
이 글은 498 번 읽혔습니다.
FNOP
No Operation
참고 사항
아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.
Opcode | Instruction | 64-Bit | Compat/ | Description |
|---|---|---|---|---|
D9 D0 | Valid | Valid | No operation is performed. |
Description
Performs no FPU operation. This instruction takes up space in the instruction stream but does not affect the FPU or machine context, except the EIP register and the FPU Instruction Pointer.
This instruction's operation is the same in non-64-bit modes and 64-bit mode.
FPU Flags Affected
C0, C1, C2, C3 undefined.
Floating-Point Exceptions
None
Protected Mode Exceptions
#NM
CR0.EM[bit 2] or CR0.TS[bit 3] = 1.
#MF
If there is a pending x87 FPU exception.
#UD
If the LOCK prefix is used.
Real-Address Mode Exceptions
Same exceptions as in protected mode.
Virtual-8086 Mode Exceptions
Same exceptions as in protected mode.
Compatibility Mode Exceptions
Same exceptions as in protected mode.
64-Bit Mode Exceptions
Same exceptions as in protected mode.
첫
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