LAHF - Load Register AH From Flags

Usage: LAHF

Modifies Flags: None

Copies bits 0-7 of the flags register into AH. This includes flags AF, CF, PF, SF and ZF other bits are undefined.

AH := SF ZF xx AF xx PF xx CF

LAR - Load Access Rights (286+ protected)

Usage: LAR dest,src

Modifies Flags: ZF

The high byte of the of the destination register is overwritten by the value of the access rights byte and the low order byte is zeroed depending on the selection in the source operand. The Zero Flag is set if the load operation is successful.

LDS - Load Pointer Using DS

Usage: LDS dest,src

Modifies Flags: None

Loads 32-bit pointer from memory source to destination register and DS. The offset is placed in the destination register and the segment is placed in DS. To use this instruction the word at the lower memory address must contain the offset and the word at the higher address must contain the segment. This simplifies the loading of far pointers from the stack and the interrupt vector table.

LEA - Load Effective Address

Usage: LEA dest,src

Modifies Flags: None

Transfers offset address of "src" to the destination register.

LEAVE - Restore Stack for Procedure Exit (80188+)

Usage: LEAVE

Modifies Flags: LEAVE

Releases the local variables created by the previous ENTER instruction by restoring SP and BP to their condition before the procedure stack frame was initialized.

LES - Load Pointer Using ES

Usage: LES dest,src

Modifies Flags: None

Loads 32-bit pointer from memory source to destination register and ES. The offset is placed in the destination register and the segment is placed in ES. To use this instruction the word at the lower memory address must contain the offset and the word at the higher address must contain the segment. This simplifies the loading of far pointers from the stack and the interrupt vector table.

LFS - Load Pointer Using FS (386+)

Usage: LFS dest,src

Modifies Flags: None

Loads 32-bit pointer from memory source to destination register and FS. The offset is placed in the destination register and the segment is placed in FS. To use this instruction the word at the lower memory address must contain the offset and the word at the higher address must contain the segment. This simplifies the loading of far pointers from the stack and the interrupt vector table.

LGDT - Load Global Descriptor Table (286+ privileged)

Usage: LGDT src

Modifies Flags: None

Loads a value from an operand into the Global Descriptor Table (GDT) register.

LIDT - Load Interrupt Descriptor Table (286+ privileged)

Usage: LIDT src

Modifies Flags: None

Loads a value from an operand into the Interrupt Descriptor Table (IDT) register.

LGS - Load Pointer Using GS (386+)

Usage: LGS dest,src

Modifies Flags: None

Loads 32-bit pointer from memory source to destination register and GS. The offset is placed in the destination register and the segment is placed in GS. To use this instruction the word at the lower memory address must contain the offset and the word at the higher address must contain the segment. This simplifies the loading of far pointers from the stack and the interrupt vector table.

LLDT - Load Local Descriptor Table (286+ privileged)

Usage: LLDT src

Modifies Flags: None

Loads a value from an operand into the Local Descriptor Table Register (LDTR).