> > > ; The macro senses if there is need to set PCLATH.
> > > ; If setting PCLATH (corrupt W) it saves and restores W in Wtemp if
> > Wtemp<>0.
> > > ; So we have fully automatic code optimization!
> > > CALLPAGE        macro target,Wtemp
> > >         if high target == high $    ;No need to change PCLATH
> > >                 messg "CALLPAGE evaluated to simple call"
> > >         else
> > >                 if Wtemp == 0 ;Do not save and reload W, +2
> instructions
> > >                         movlw   high target
> > >                         movwf   PCLATH
> > >                 else ;Save and restore W using register adress Wtemp,
> +4
> > instr.

> > >                         movwf   Wtemp
> > >                         movlw   high target
> > >                         movwf   PCLATH
> > >                         movf    Wtemp,W
    1 data ram location used

> > >                 endif
> > >         endif
> > >         call target
> > >         endm

                     ;    W                   PCLATH
                     ;  Wval                  ???
  movwf  PCLATH      ;  Wval                  Wval
  xorlw  high target ;Wval XOR high target    Wval
  xorwf  PCLATH,f    ;Wval XOR high target    high target
  xorwf  PCLATH,w    ;  Wval                  high target

These 4 instructions made the same work but not use data ram.

--
/* Alexandr Redchuk     ReAl@real.kiev.ua  */