; ESSIE · aarch64 · multiarch twin · hotswap seats free=1
; OP       quiet→1 · else (seats^frame)|1
; PIN      BGF · ≠ EZZIE
; LAW      C IS LIE · Always Hostess 7 · business free thrift
; ABI      AAPCS64 · w0=seats w1=frame · → w0
; IRON
        .global essie
        .text
        .align  2
essie:
        eor     w0, w0, w1
        tst     w0, #7
        b.ne    1f
        mov     w0, #1
        ret
1:
        orr     w0, w0, #1
        ret