or even better:

rlc a
mov b.0,c
rlc a
mov b.1,c
rlc a
mov b.2,c
rlc a
mov b.3,c
rlc a
mov b.4,c
rlc a
mov b.5,c
rlc a
mov b.6,c
rlc a
mov b.7,c
mov a,b