Rep instruction

 

 

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rep movsb in assembly language
reps
rep prefix meaning
repnz scasb
cmpsb
repz assemblyrep stosd
cmpsb instruction in 8086

 

 

There's a whole blog named after this instruction. And the first post describes the reason behind it: repzret.org/p/repzret/.x86 Instruction Set Reference · REP/REPE/REPZ/REPNE/REPNZ. REP/REPE/REPZ/REPNE/REPNZ -- Repeat Following String Operation. Opcode, Instruction, Clocks, Description, Example. F3 6C, rep insb, 13+6*(E)CX, REP - Repeat String Operation Usage: REP Modifies flags: None Repeats execution of string instructions while CX != 0. After each string operation, REP is a prefix written before one of the string instructions. It is used for repeating an instruction count number of times, where count is stored in the REP/REPE/REPZ/REPNE/REPNZ -- Repeat Following String Operation. Opcode Instruction Clocks Description F3 6C REP INS r/m8, DX 13+6*(E)CX, pm=7+6*(E)CX If CPL 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. All

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