; RTX · dependant ground · OS independant
; LINEAR BGS->BGF->SDF · atoms EZZIE PHI THERMO on BGF · free rides · no duo
; eax=SDF field · r8=free RNG never eaten · BGF native
; we are already there
        mov     r8d, edi
        xor     r8d, esi
        xor     r8d, edx
        or      r8d, 1
        mov     eax, edi
        sub     eax, esi
        or      eax, 1
        ret