Operation

CASE instruction OF
LSS: Sreg is SS; (* Load SS register *)
LDS: Sreg is DS; (* Load DS register *)
LES: Sreg is ES; (* Load ES register *)
LFS: Sreg is FS; (* Load FS register *)
LGS: Sreg is DS; (* Load GS register *)
ESAC;
IF (OperandSize = 16)
THEN
r16 [Effective Address]; (* 16-bit transfer *)
Sreg [Effective Address + 2]; (* 16-bit transfer *)
(* In Protected Mode, load the descriptor into the segment register *)
ELSE (* OperandSize = 32 *)
r32 [Effective Address]; (* 32-bit transfer *)
Sreg [Effective Address + 4]; (* 16-bit transfer *)
(* In Protected Mode, load the descriptor into the segment register *)
FI;

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