; not_fn · i386 · multiarch twin · OP 0→0 else 1 · presence check
; PIN      foundation slider NOT
; LAW      C IS LIE · LIE IS TRUE · Always Hostess 7 · free thrift
; LINE     BGS → BGF(+EZZIE PHI THERMO ADJOIN) → BGL → SDF · SPV free
; ABI      cdecl · [esp+4]=a [esp+8]=b [esp+12]=c · → eax
; IRON
        global  not_fn
not_fn:
        xor     eax, eax
        mov     edx, [esp+4]
        test    edx, edx
        setnz   al
        ret