I added some instruction cycle information last night (Thursday). I haven't added any more information this morning.



Yes.



Sure. I'm going to adjust the 17-best/467-worst to 18-best/468-worst because I was assuming that the number of bits to shift were passed to it in R3 rather than ACC. Since the challenge specifies that it should be received in ACC, I added a MOV R3,A at the beginning which adds one instruction cycle.

The unoptimized reference code for the challenge is:

Shift:
   MOV         R3,A
Loop:
   CLR         C
   MOV         A,R4
   RRC         A
   MOV         R4,A
   MOV         A,R5
   RRC         A
   MOV         R5,A
   MOV         A,R6
   RRC         A
   MOV         R6,A
   MOV         A,R7
   RRC         A
   MOV         R7,A
   DJNZ        R3,Loop
   RET

Regards,
Craig Steiner