How to learn assembely?

[T.Jackson]

Main reason why Select Case is faster than using multiple IF's is because not all conditions are checked, only the first true condition in a Select Case argument has its underlying block of code executed.

That's my theory on it anyway.

[mister_e]

unless your using a little bit of your brain, it's true.

plah plah plah
Avar=Whatever
Gosub StartSelectCase
plah
plah
plah
'
'
'

StartSelectCase:
    If AVar=1 then
        Dosomething
        Return
        Endif

    If AVar=2 then
        Dosomething
        Return
        Endif
    '
    '
    '
    If AVar=x then
        Dosomething
        Endif

    Return

V2

AVar = Whatever

StartSelectCase:
    If AVar=1 then
        Dosomething
        Goto EndSelectCase
        Endif

    If AVar=x then
        Dosomething
        Goto EndSelectCase
        Endif
    '
    '
    '
    If AVar=y then
        Dosomething
        Endif
EndSelectCase:

Sort of what's under the SelectCase hood.

Now depending how the compiler, language interpret/optimise it, one can be faster than the other. It's hard to tell which will ALWAYS be faster so far as there's millions (and more) different possible itteration/conditions.

Both get the job done! One is easier to read, implement debug.

[T.Jackson]

Pretty sure you'll find that for every IF argument, unlike Select Case, the subject variable to compare with is loaded into a working register each time.
However with Select Case it's already there for the next compare. Possibly the closed analogy of Select Case would be ELSEIF. But it's no where near as flexible unfortunately.
<br/>

[mister_e]

Back to the original topic. Here's an interesting MicroChip on-line flash tutorial.

http://techtrain.microchip.com/x14/