image/svg+xmlSTD—Set Direction FlagInstruction Operand EncodingDescriptionSets the DF flag in the EFLAGS register. When the DF flag is set to 1, string operations decrement the index regis-ters (ESI and/or EDI). Operation is the same in all modes.OperationDF := 1;Flags AffectedThe DF flag is set. The CF, OF, ZF, SF, AF, and PF flags are unaffected.Exceptions (All Operating Modes)#UD If the LOCK prefix is used.OpcodeInstructionOp/ En64-bit ModeCompat/Leg ModeDescriptionFDSTDZOValidValidSet DF flag.Op/EnOperand 1Operand 2Operand 3Operand 4ZONANANANA

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