Save some bytes in program memory

[Ioannis]

Say you want to increment a variable and check the upper limit.

One way is this:

if index<3 then
    index=index+1
else
    index=0
endif

which compiles for a 16F877 to 16 bytes.

Using this one:

index=index+1 & 3

compiles to 12 bytes.

And even better:

index=index+1 
index=index & 3

compiles to 7 bytes only!

Ioannis

P.S. Thanks to Mike K8LH for spotting a typo error.