In message
 <c=US%a=_%p=GE%l=AP3EXPR1-970319031320Z-17686@ap3exh02applge.appl.ge.com>
 PICLIST@MITVMA.MIT.EDU writes:
> Say folks,
>
> In the past to test a register for the existence of zero I would perform
> some sort of mask operation.  This time I thought I would try my hand at
> using the ZERO STATUS BIT.
>
> hasn't worked yet.
>
> Apparently I've got to first SET the zero bit PRIOR to performing a move
> operation?  What I noticed is that ANY operation, zero or not, with
> instructions like MOVF, or DECF will CLEAR the zero bit!
>
> Any advice on how to check a register for zero?  It seems like such a
> silly question, but I haven't been successful at it yet.
>
Pete,

I use the macros built in to MPASM:

  tstf  my_reg
  skpz

or

  tstf  my_reg
  skpnz

I hope this helps,


Mike Watson