[Issue 5276] Template compilation slower than G++ 4.5

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=5276

--- Comment #3 from bearophile_hugs at eml.cc ---
(In reply to safety0ff.bugz from comment #2)
> I'm getting:

Now my timings for N=7 are about 1 second for dmd, and about 1.1 seconds for
g++. So for this benchmark the dmd performance problem is not a problem.

Is the lazy instantiation of templates recently introduced by Walter the cause
of this significant performance increase?

For N=7 dmd uses about 130 MB RAM, while g++ uses about 30 MB.

So the memory usage is about the same, but now dmd is much faster than before.

So the original bug report could be closed. Or I can rename it, turning it into
a memory usage problem instead: on my system I can compile the C++ code with
N=9 (it uses about 1/2 GB RAM), but I think I can't compile the D code with N=9
on my PC.

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