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which is faster switch() or if() else; trees

 
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neochrome32



Joined: 09 Jun 2013
Posts: 153

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which is faster switch() or if() else; trees
PostPosted: Mon Feb 24, 2014 8:32 pm     Reply with quote
CCS C 4.130
im not getting any meaning full info from my debugger so im calling on experiences Smile

i have a massive tree of register choices
currently i have

Code:

if(b==1)
do();
else if(b==2)
do();
else if(b==3){
some stuff here
}




i cant determine if above code would be faster/efficient

than

Code:

switch(b){
case 0:
break;
case 1:
..............
}


im trying to speed up my SID part of the speech chip,

currently im making choices on an tree off if else if's

thanks guys/gals Smile
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Feb 24, 2014 8:46 pm     Reply with quote
See these posts by Ttelmah:
http://www.ccsinfo.com/forum/viewtopic.php?t=47315
http://www.ccsinfo.com/forum/viewtopic.php?t=45415

This thread has links to even more:
http://www.ccsinfo.com/forum/viewtopic.php?t=42772
neochrome32



Joined: 09 Jun 2013
Posts: 153

View user's profile Send private message Visit poster's website

PostPosted: Mon Feb 24, 2014 9:20 pm     Reply with quote
thats weird, i did a search for this topic, i didn't find anything..........
thanks for pointing me at the right place Smile
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Feb 24, 2014 9:53 pm     Reply with quote
I had an advantage. I've been on the forum a long time and I knew
the posts were there. I just played around with search terms until
I found them.
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