x86 Instruction Set Reference
LAHF
Load Status Flags into AH Register
| Opcode | Mnemonic | Description |
|---|---|---|
9F |
LAHF |
Load: AH = EFLAGS(SF:ZF:0:AF:0:PF:1:CF). |
| Description |
|---|
|
Moves the low byte of the EFLAGS register (which includes status flags SF, ZF, AF, PF, and CF) to the AH register. Reserved bits 1, 3, and 5 of the EFLAGS register are set in the AH register as shown in the "Operation" section below. |
| Operation |
|---|
AH = EFLAGS(SF:ZF:0:AF:0:PF:1:CF); |
| Flags affected |
|---|
|
None (that is, the state of the flags in the EFLAGS register is not affected). |
| Exceptions |
|---|
| None. |