Fastest Technique? 'elseif' or 'or'

Blitz3D Forums/Blitz3D Programming/Fastest Technique? 'elseif' or 'or'

OverDozing

(Posted 2006) [#1]

Hey What is faster between those 2 expressions:

this:
if a=1 then
...
elseif b=1 then
...
elseif c=1 then
...
end if

or this:
if a=1 or b=1 or c=1 then
...
end if

?

Stevie G

(Posted 2006) [#2]

I wouldn't be too concerned about optimising this kind of thing. The difference is negligible and would not be a bottleneck in your code.

That said, you would have to evaluate between 1 and 3 pieces of logic in the first example, whereas the second would always be 3. So, logically the first would be faster in most cases.

Stevie

OverDozing

(Posted 2006) [#3]

aaaaah ok gotcha !!
thanks ^^

Ross C

(Posted 2006) [#4]

Continuing what Stevie says, you should first most make your code as easy to understand as possible. Optimising these things might sacrifice how easy it is to read or add/change your code.

H&K	(Posted 2006) [#5]

ALso they do not do the same thing.

if a=1 then
...                 Run this when a=1
elseif b=1 then
...                 Run this when a<>1 AND B=1
elseif c=1 then
...                 Run this when A<>1 AND B<>1 AND c=1
end if


if a=1 or b=1 or c=1 then
...                 Run this when A=1 or B=1 or C=1
end if

SO my answer would be use the one you need

OverDozing

(Posted 2006) [#6]

I can't agree more your remark; I abandoned so many projects due to uneasy readable codes...

But now, I think I got it, everything is well organized and in some cases the use of 'elseif' make it even more readable, so that's kool!

My current program is around 7000 lines and I can find what I am looking for real fast. ^^

MadJack

(Posted 2006) [#7]

I'm finding the biggest slowdown in my project is linepicks and the collision system...