www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - Optimizing with large numbers of templates

reply Christopher Wright <dhasenan gmail.com> writes:
Hey all,

I've got a sample that did take five minutes to compile and produced a 
4MB executable, and now it's down to 2MB and just over a minute, but 
most of that (1.6MB) is just template code, and I'd like to reduce that 
further.

What are the typical suggestions for optimizing code that's heavy on 
templates? My major problem is build time, though executable size is 
also a concern. Runtime isn't important (the current code can run 10,000 
times in a hundredth of a second on that hideously large example, and it 
shouldn't need to run very much at all).

For reference, the code is dconstructor, and the example is speed.d from 
the examples folder:
svn co http://svn.dsource.org/projects/dmocks/dconstructor/trunk
Aug 25 2008
parent bearophile <bearophileHUGS lycos.com> writes:
Christopher Wright:
 What are the typical suggestions for optimizing code that's heavy on 
 templates? My major problem is build time, though executable size is 
 also a concern.

You can try to replace many of the templates that compute stuff at compile time with compile-time functions (where they don't produce bugs). They are faster. Bye, bearophile
Aug 26 2008