> Hello,
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> Some time ago I wrote an Insertion sort algorithm for Mid-range PICs and=
=20
> today decided to optimize it as much as possible. For this I need to=20
> load the negative value of an address of a variable. Using 'movlw  0 -=20
> var' or 'addlw 0 - var', where var is a file register is not accepted by=
=20
> MPASM, and 'Error[151] : Operand contains unresolvable labels or is too=20
> complex' is issued.
>=20
> Currently I found 2 workarounds - one needs an extra instruction to=20
> convert the loaded address to a negative number, and the other defines=20
> an absolute address of 'var' in RAM and then a precalculated negative=20
> value of that address is used in the code.
>=20
> Both of these do not seem right, so I'm searching for a trick to negate=20
> the address of 'var' in the preprocessor, without triggering an error.
>=20

The preprocessor doesn't know the address of var.

/Ruben


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Ruben J=F6nsson
AB Liros Electronic
Box 9124
200 39 Malm=F6 Sweden
www.liros.se
Tel +46 40142078
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