; MEM ABC · BGF line · eax measure/SDF place · r8 free ride · no fold
; LINEAR BGS->BGF->SDF · atoms EZZIE PHI THERMO on BGF · free rides · no duo
        mov     eax, [rdi]
        mov     r8d, eax
        mov     ecx, [rsi]
        xor     r8d, ecx
        mov     r9d, [rdx]
        xor     r8d, r9d
        or      r8d, 1
        sub     eax, ecx
        or      eax, 1
        ret