Rep movsb instruction in 80386

movsb x86
rep assembly
lodsb instruction in 8086rep movsb in assembly language
movsw
rep movsb example
movsq
movsb instruction in 8086 example

The MOVSB instruction tells the assembler to move data as bytes; the MOVSW implies the string is to be moved as words. Usage MOVS dest, src (This usage is {REP} MOVSB {REP} MOVSW {REP} MOVSD ;Available only on 80386+ {REP} MOVS Dest, Source. The movsb (move string, bytes) instruction fetches the byte at up: Chapter 17 -- 80386 Instruction Set prev: MOV Move to/from Special Registers next: MOVSX Move with Sign-Extend. MOVS/MOVSB/MOVSW/MOVSD -- Move MOVSB. Move byte at address DS:(E)SI to address ES:(E)DI The MOVS, MOVSB, MOVSW, and MOVSD instructions can be preceded by the REP prefix (see MOVBS, I hope you ment MOVSB REP - This is short form of REPeat. This instruction is used with string instructions/operations to repeat a perticular task inThe MOVS, MOVSB, MOVSW, and MOVSD instructions can be preceded by the REP prefix (see "REP/REPE/REPZ/REPNE /REPNZ-Repeat String Operation Prefix" in Chapter Opcode, Instruction, Clocks, Description, Example. F3 6C, rep insb F3 A4, rep movsb, 5+4*(E)CX, Move (E)CX bytes from [(E)SI] to ES:[(E)DI], rep movsb. The semantics of the instructions MOVSB, MOVSW, and MOVSD are illustrated 100 bytes from Array1 to Array2, using MOVSB instruction with the REP prefix. The REP prefixes apply only to one string instruction at a time. To repeat a block of instructions, use the LOOP instruction or another looping construct. The