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What general tips do you have for golfing in S.I.L.O.S? I'm looking for ideas which can be applied to code-golf problems and which are also at least somewhat specific to S.I.L.O.S (e.g. "remove comments" is not an answer).

Please post one tip per answer.

S.I.L.O.S can be run here.

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2
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Abuse the preprocessor

All SILOS programs can optionally have a macro statement on the second line

Consider the following program... One of my favorite SILOS submissions by betseg.

a=97
def q print z bottle v beer L Line g wall x IntNoLine h the c around
qL 99 zs of v on h g, 99 zs of v.
lbls
q Take one down and pass it c, 
a+1
qx a
qL  zs of v on h g.
qx a
q  zs of v on h g, 
qx a
qL  zs of v.
a-2
if a s
qL Take one down and pass it c, 1 z of v on h g.
qL 1 z of v on h g, 1 z of v.
q Go to h store and buy some more, 99 zs of v on h g.

Look at that savings Try it out!

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1
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Never sometimes divide by 0.

Consider a challege where we should output the input if it is not 0 and output -1 otherwise. We could do the following.

S.I.L.O.S, 50 bytes

readIO
if i b
print -1
GOTO c
lblb
printInt i
lblc

Try it online!

However, that is far from optimal. The "superior" solution would be this.

S.I.L.O.S, 33 bytes

readIO
j=i
i/i
j=j+i-1
printInt j

Try it online!

SILOS will quietly ignore the division by 0, which results in a no-op.

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0
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Never declare variables

There is no need to declare a variable. All variables are automatgically initialized to 0.
Hence, this-

a=0
a=97
printInt a

Is the same as this

a=97
printInt a
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