H_Times_E

H_Times_E:
;Inputs:
;     H,E
;Outputs:
;     HL is the product
;     D,B are 0
;     A,E,C are preserved
;Size:  12 bytes
;Speed: 311+6b, b is the number of bits set in the input HL
;   average is 335 cycles
;   max required is 359 cycles
     ld d,0 ;1600   7   7
     ld l,d ;6A 4   4
     ld b,8 ;0608   7   7
        ;
     add hl,hl  ;29 11*8    88
     jr nc,$+3  ;3001   12*8-5b 96-5b
     add hl,de  ;19 11*b    11b
     djnz $-4   ;10FA   13*8-5  99
        ;
     ret    ;C9 10  10