Lame I agree.  But the 17Cxxx are built so you don't really need to use
that instruction of using the appropriate paradigm.
Here is a low efficiency replacement:

COMF FILEREG, F
COMF FILEREG, F


On Tue, 25 May 1999, TYR130010 wrote:

> Hello all, I am a recent convert to PIC devices, and writing for 17C756.
>
> I have noticed one particularly irritating short coming;
> you can't do an equivalent: MOVF  "FILEREG",F in the 17C devices
> like you can in the 16C devices  to change the Z flag.
>  The TSTFSZ works if you want to Skip on zero, but there is no
> complementary "TSTFSNZ" instructions.
> The nice thing about the TSTFSZ is it affects only the Z flag, and no
> other registers or flags.
>
> Maybe there are some old hands who have created macros that do the
> job as efficiently as possible with minimal impact on, or disturbance
> to any registers who wouldn't mind sharing them with everyone.
>
> Or if not, maybe a little game perhaps, to see who can come up with
> the neatest, most useful, compact, and documented ( so everyone can -
> - understand  ) macro?
>
> I feel this would be a very useful subject for novice programmers.
> While we're at it, we might as well cover some of the ground rules
> for use of Macro's, such as you don't use them immediately after a
> "Test and Branch" instruction for obvious reasons.
>
> I will venture this "glove" in the spirit of being taught my place.
> You never know I just "might" learn something new ;)
>
> This macro started as a joke, but it does with W what the complement
> of  TSTFSZ  WREG  would do .
>
>                     ; Tests WREG without disturbing it, and only affects
> Z flag.
> TSTWSNZ     MACRO
>                     IORLW    00H                  ; Won't affect value
> in W
>                     BTFSC    ALUSTA,Z        ; SKIP IF W <> ZERO
>                     ENDM
>
>
> hfoster@tyler.net
>