모두의 코드
LAHF (Intel x86/64 assembly instruction)
LAHF
Load Status Flags into AH Register
참고 사항
아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.
Opcode | Instruction | Op/ | 64-Bit | Compat/ | Description |
|---|---|---|---|---|---|
9F | NP | Invalid* | Valid | Load: AH <- EFLAGS(SF:ZF:0:AF:0:PF:1:CF). |
*Valid in specific steppings. See Description section
Instruction Operand Encoding
Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|
NP | NA | NA | NA | NA |
Description
This instruction executes as described above in compatibility mode and legacy mode. It is valid in 64-bit mode only if CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 1.
Operation
IF 64-Bit ModeTHENIF CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 1;THEN AH <- RFLAGS(SF:ZF:0:AF:0:PF:1:CF);ELSE #UD; FI;ELSEAH <- EFLAGS(SF:ZF:0:AF:0:PF:1:CF);FI;
Flags Affected
None. The state of the flags in the EFLAGS register is not affected.
Protected Mode Exceptions
#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
#UD
If CPUID.80000001H:ECX.LAHF-SAHF[bit 0] = 0.
If the LOCK prefix is used.
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