Type of instruction: User
Substracts destination value from source without saving results.
Updates flags based on the substraction and the index registers (E)SI
and (E)DI are incremented/decremented depending on state of Direction
Flag. CMPSB increments/decrements index registers by 1, CMPSW by 2,
CMPSD by 4. REP prefixes can be used to process entire data items.
CPU mode: RM,PM,VM,SMM
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