std

8086 and later

Set Direction Flag

std

These instructions set various flags. STC sets the carry flag; STD sets the direction flag; and STI sets the interrupt flag (thus enabling interrupts).

To clear the carry, direction, or interrupt flags, use the CLC, CLD and CLI instructions (CLC). To invert the carry flag, use CMC (CMC).

Forms

Every form of std the assembler accepts, from NASM's own instruction table. The second column is the processor that introduced the form; a badge marks a form that needs an extension, that is lockable, or that long mode dropped.

Form	Since	Notes
std	8086