BTW, you realise that after 8 shifts, temp_var = 11111111
and the 0 will be in C ? If you want

11111101
11111110
01111111
10111111

without 11111111 in the middle, you'll have use a more
complicated loop testing C=0, eg include a skpc or skpnc
conditional branch after RRF TEMP_VAR,W if you don't
want 11111111 ever to be in TEMP_VAR whilst looping

As for your problem, are interrupts on or something ? If
TEMP_VAR is being sent to a port (or especially if you're
attempting to rotate the port register itself), watch out for
r-m-w, and use a shadow register instead

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