REP
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Repeat String Flags: O D I T S Z A P C
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Syntax: REP instruction
Repeats the string instruction the number of times indicated by CX.
For each string element, the string instruction is performed and CX
is decremented. When CX reaches 0, execution continues with the next
instruction. REP is normally used with MOVS and STOS. (REP
LODS is legal, but has the same effect as LODS.) REP is addi-
tionally used with INS and OUTS on the 80186-80386 processors. On
all processors except the 80386, combining a repeat prefix with a segment
override may cause errors if an interrupt occurs during a string operation.
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