You wrote
Snip
<IF w = f then , IF w<>f then , IF w > f then , IF w < f then>

I think this might work
firstly check if w=f by subtraction and checking Z and testing returning a 1
in the w register for the first result. secondly test for a carry (w>f)
(2)else the result is (w<f) (3) and by default w<>f and does not need
computing.

Call        Choice

Choice
SUBWF    f,w                ;subtract w from file
BTFSC     STATUS,Z     ; test for zero (w=f)
RETLW     1                  ; exit sub w=1 (w=f)
BCF         STATUS,C     ; clear carry before starting
SUBWF     f,w               ; do again and check for borrow
BTFSS     STATUS,C     ; test for carry (w>f)
RETLW     2                  ; exit sub w=2 (w<f)
RETLW     3                  ; exit sub w=3 (w>f) by default

minor fracture in the thaught process cant remember if Ive got the bit test
in the correct polarity but try it and see (Its close)...

Steve.....