Problems with dmd inlining

[Jason House]

Simen kjaeraas Wrote:

> Jason House <jason.james.house at gmail.com> wrote:
> 
> > I wish I had your problems. I ported a sizable set of C++ code to D2 and  
> > discovered D2 with dmd was 50x slower than C++ with gcc! I've been to  
> > busy/disappointed to track down the bug(s) causing such a slowdown. If  
> > anyone is sufficiently inspired to find the bugs, I can make the GPL  
> > source code available.
> 
> If no-one else has stepped up, I'm willing to have a look.

Thanks Simen.  I sent a reply to the e-mail you gave in this newsgroup with the following things:
  .tar.gz with c++ source (2178 lines)
  .tar.gz with D2 source + ranges (1690 lines)
  .tar.gz with D2 source + string mixins (1696 lines)
  dmd's -profile output for the range-based version
  Very basic description of where the source came from and what it's doing
  An svg showing c++ dependency tree built from the #includes

Benchmarking again, it appears I exaggerated.  The D2 code compiled with -gc -release -inline -noboundscheck -O is only 33x slower (not 50x).  My test this evening was with dmd 2.047 and g++ 4.4.5.