On 11 August 2015 at 16:02, Martin Nowak via dmd-internals <dmd-internals@puremagic.com> wrote:

On 08/11/2015 03:24 PM, Martin Nowak via dmd-internals wrote:
> And the profiles of both are very similar, e.g. comparing the relative
> times spend compiling dub.
> https://dawg.eu/dmd_vs_ddmd_prof.svg

Same graph comparing absolute times.
https://dawg.eu/dmd_vs_ddmd_prof_abs.svg

Those extra memcpy calls look interesting.  I wonder whether it's because g++ inlines small copies, or the dmd codegen produces a *lot* of them where a better alternative could be used.

Also, I wonder whether making use of `= void` for local declarations that don't have an initializer helps at all with anything performance-wise.  That at least should be a trivial change to magicport.

Iain