Re: [Boost-users] [operators] loss of performance

From: John Maddock (john_at_[hidden])
Date: 2006-05-08 12:30:13

> Any ideas how to increase the performance of the new code here?  A
> factor of 10 makes it seem like I am just missing something important.

I would suspect it's the loop that's at fault, although very I'm surprised 
it's a factor of 10.  Your original code had the loop unrolled, so you might 
try a bit of template metaprogramming to achieve the same effect here. 
Otherwise you're going to have to do a bit of debugging and/or inspection of 
the assembly generated.

BTW the measurements you made were in release mode right?  If inline 
expansions are turned off (debug mode for example) the operators-based 
version may well pass through many more function calls.  Of course these all 
disappear as long as your compiler does a reasonable job of inlining.

HTH, John.