CMPS Des, Src:
- It compares the string bytes or words.
SCAS String:
- It scans a string.
- It compares the String with byte in AL or with word in AX.
MOVS / MOVSB / MOVSW:
- It causes moving of byte or word from one string to another.
- In this instruction, the source string is in Data Segment and destination string is in Extra Segment.
- SI and DI store the offset values for source and destination index.
REP (Repeat):
- This is an instruction prefix.
- It causes the repetition of the instruction until CX
- becomes zero.
- It copies byte by byte contents.
- REP repeats the operation MOVSB until CX becomes zero.
