David BALDWIN wrote:
>
> Does anybody has a set of well-known (for you...) functions like:
>
>         if A>B then goto ...
>         if A<=B then ... else ...
>         ... etc

In case when B is constant and A>B construction need:

;A>B then goto ADDR
       MOVFW A
       SUBLW B
       SKPC      ;SKIP IF A<=B
       GOTO ADDR ;GOTO IF A>B
       .......
ADDR:

In case when A and B are variables and A<=B construction need:
;A<=B
       MOVFW A
       SUBWF B,W
       SKPC     ;SKIP IF A<=B
       GOTO ELSE
THEN:  .....

ELSE:  .....

At any situation check Carry bit status after SUBWF operation was carry
out.
SUBWF REG,W result to Carry=1 if (REG-W)>=0 else Carry will be equal
zero(0).
SUBLW CONST result to Carry=1 if (CONST-W)>=0 else Carry=0.

WBR Dmitry.

P.S. It's common question as I see, at more definite
situation probably exist better solution.