C_Times_D

C_Times_D
;Inputs:
;     C,D
;Outputs:
;     A is the product
;     B is 0
     ld b,8          ;7           7
     xor a           ;4           4
       rlca          ;4*8        32
       rlc c         ;8*8        64
       jr nc,$+3     ;(12|11)    96|88
         add d       ;--
       djnz $-6      ;13*7+8     99
     ret             ;10         10
;304+b (b is number of bits)
;304*256
;308 is average speed.
;12 bytes