Respuesta :
In Assembly Language, when the Direction flag is set (1), string primitives are executed with index registers moving backward through memory.
The FLAGS register on all x86-compatible CPUs contains a flag called the direction flag, which controls whether string processing proceeds left-to-right or right-to-left. It is bit number 10.
This flag is used to specify whether several bytes of data will be copied from one location in the memory to another in the "forward" or "backward" direction. When the target data position and the original data position in memory overlap, the direction becomes particularly crucial.
If it is set to 0 (using the clear-direction-flag instruction CLD), the string is processed starting at the lowest address and working its way up; this mode of instruction is known as auto-incrementing mode.
In cases where it is set to 1 (using the set-direction-flag instruction STD), the string is processed from highest to lowest address. Both the source index and destination index will increase them (like MOVS). The term for this is auto-decrementing mode.
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