Log of base 2
; input: hl (unsigned) ; output: a = log2(hl) (rounded down and from -1 to 15) (8-bit integer signed) log2: ld a, 16 scf log2loop: adc hl, hl dec a jr nc, log2loop ret
; input: hl (unsigned) ; output: a = log2(hl) (rounded down and from -1 to 15) (8-bit integer signed) log2: ld a, 16 scf log2loop: adc hl, hl dec a jr nc, log2loop ret