Are there any ways to simulate a stack that is 40 bytes deep?

Much to my disappointment, I just found out the following code doesn't work
the way I thought it would.

movwf Reg1 + Var

where the contents of 'Var' offset the address. Instead the address of 'Var'
is the offset. It seems obvious in retrospect (600 lines of retrospect!!).
Goes to show the importance of testing as you go. I'm hoping there's some
way to save my effort.

The line is used in several instances but mostly in loops where Var is
decremented with each pass.

All help appreciated
Nick

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