movs instruction examplemovsb instruction in 8086 example
movsb x86
movsb instruction in assembly language
movsb assembly example
rep movsb in assembly language
rep movsb example
cmpsb instruction in 8086

The power of 80386 string operations derives from the following features of the The MOVS instruction, when accompanied by the REP prefix, operates as aOpcode Instruction Clocks Description F3 6C REP INS r/m8, DX 13+6*(E)CX, 8086 mode Input (E)CX dwords from port DX into ES:[(E)DI] F3 A4 REP MOVS m8,m8 The 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 {REP} MOVSB {REP} MOVSW {REP} MOVSD ;Available only on 80386+ {REP} MOVS Dest, Source. The movsb (move string, bytes) instruction fetches the byte at The semantics of the instructions MOVSB, MOVSW, and MOVSD are illustrated the Loop instruction, the string instructions come with a repeat prefix, REP, 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 MOVS can be preceded by the REP prefix for block movement of CX bytes or words. Refer to the REP instruction for details of this operation. Flags Affected. None 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 To repeat a block of instructions, use the LOOP instruction or another looping construct. The precise action for each iteration is as follows: