Wondering about speed of programs

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Wondering about speed of programs

LemonDrop 01 Jun 2013 09:28

I was wondering some about if statements. So if I had the following:

If A
//Lots of code
End

If B
//More
End

Would that be faster than:

If A
Then
Code
Else:If B
Then
Code
End
End

Also is the speed of a false if statement dependant on the length of the code it contains (long code takes longer) or is it not related

Re: Wondering about speed of programs

Xeda Elnara 01 Jun 2013 10:06

I typically test such code in For( loops. Notice that with your Else version, If B is only tested If not(A, but in your previous code, If B is tested regardless of how If A evaluated. I did test this code though (note that timings are off by as much as a second):

checkTmr(0→D
For(A,0,3999
If B
Then
"BLAH
End
If not(B
Then
"GOOK
End
End
checkTmr(D

This took ~49 seconds, compared t 34 seconds for:

checkTmr(0→D
For(A,0,3999
If B
Then
"BLAH
Else
"GOOK
End
End
checkTmr(D

35 seconds for:

checkTmr(0→D
For(A,0,3999
If not(B
Then
"BLAH
Else
"GOOK
End
End
checkTmr(D

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Z80 Assembly>English>TI-BASIC>Python>French>C>0

Re: Wondering about speed of programs

Roguebantha 01 Jun 2013 16:54

Hmmm…I think there's some article somewhere on TI-BASIC Dev about this, but I'm not sure…

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Re: Wondering about speed of programs

LemonDrop 02 Jun 2013 00:43

Thanks thats quite a good idea, and that was just an example. My real code has like 10 if statements all with unique conditions. The thing I am worried about is that because each if-else has 100-250 lines of code between it so I was looking for the most efficient way to get past false statements before it.

Re: Wondering about speed of programs

Mr Dino 02 Jun 2013 20:07

timings