SCAS

SCAS - Scan String (Byte, Word or Doubleword)

Compares value at ES:DI (even if operand is specified) from the accumulator and sets the flags similar to a subtraction.

DI is incremented/decremented based on the instruction format (or operand size) and the state of the Direction Flag.

Use with REP prefixes.

Usage:

	SCAS	string
	SCASB
	SCASW
	SCASD		; 386+ only

Modifies flags:

AF CF OF PF SF ZF

	Clocks				Size
Operands	808x	286	386	486	Bytes
string	15	7	7	6	1	(W88=19)

2023/01/05 22:53 · frater