Re: RFC: loops

[muppet <scott asofyet org>]

On Dec 18, 2005, at 2:26 AM, Daniel Marjamäki wrote:

> I'm still trying to find a simple task that I can help you with.
> I could make a few loops faster by replacing code such as  
> (gtkaccelgroup.c:305):

[for loop with function call and array access]

> Into...

[for loop with function call and pointer iterator]

> Do you think this would be a worthwhile effort?

No.  This sort of microoptimization is only helpful on tight inner  
loops, such as the inner loop of a pixel processor.  The loop you  
show as an example calls a function, which is likely to swamp the  
optimization completely.  Additionally, some compilers generate  
better code for array accesses than for pure pointer math.

However, if you have hard numbers that show this change shaves n  
percent time off of a normal case, then by all means, please prove me  
wrong.


> Or are there better tasks that I can begin with?

I'll leave this one for someone else; i'm merely out to prevent  
unnecessary optimization.


--
Our enemies are innovative and resourceful, and so are we. They never  
stop thinking about new ways to harm our country and our people, and  
neither do we.
  -- President George W. Bush