sets

386 and later

Set byte if sign (SF == 1)

sets r/m8 | sets reg64 | sets reg32

SETcc sets the given 8-bit operand to zero if its condition is not satisfied, and to 1 if it is.

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Forms

Every form of sets 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.

FormSinceNotes
sets r/m8386long
sets reg64x86-64apxlong
sets reg32x86-64apxlong