Typically, I'll define bit-ordinal symbolics for "flags" that I'll want to
manage using the bit-wise instructions, such as:

#define DATA_RDY 0x1
...
bsf    FLAGS, DATA_RDY    ; i.e. set Bit 1 in FLAGS
...
btfsc    FLAGS, DATA_RDY    ; i.e. test Bit 1 in FLAGS
goto    svc_data_rdy
... etc.
This all works just fine, but now and then I wish the architecture would
allow the bit-ordinal value to be expressed in 'W', (i.e. as a "computed"
value, rather than a compiled constant in the code), so I could do something
like:

btfsc    FLAGS, W     ;  (NOT a valid instruction :^(
...

Any opinions on what the "next best" approach might be?  I'm thinking that a
bit-ordinal index w.r.t. PCL might be the ticket, but just wonder if there
might be more tricks I'm unaware of.
Thanks!
Jim

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