[LLVMdev] ldc (LLVM backend for the D Programming Language) has x86-64 support

Chris Lattner
Tue, 28 Oct 2008 06:32:47 -0000

On Oct 27, 2008, at 11:03 PM, Kelly W wrote:

> Hello everyone,
>
> I just thought I would let people here know that ldc (llvm backend
> for the D Programming Language) is getting pretty usable (a few
> larger libraries compile) and it now has x86-64 support added. I
> decided to run some timings on some D and C++ code to compare ldc to
> dmd (the mainline compiler), gdc (the gcc based D compiler) and g++.
> I used a ray tracing program found in this thread (make sure to use
> the code mentioned later in the thread as it has some optimizations):
>
> Go to digitalmars.com/ webnews/ newsgroups.php?renew=1 and search
> for:  “D slower than C++ by a factor of _two_ for simple raytracer
> (gdc)”

Wow, very very nice!  Have you pointed this out to the other D users?

-Chris

>
> There are versions of the tracer for D and C++ that are quite
> comparable. Here are some timings I got on an AMDx86-64 running
> Fedora Core Linux. Timings are averaged over 6 runs.
>
> llvm-g++4.0.1   5.76   (build 5449..backend from svn today)
> ldc-rev736      6.68
> g++4.1.2        6.72
> gdc0.24         7.45
> g++4.3.1        7.66
> dmd1.030        14.52
>
> As you can see D is NOT that much slower for the ray tracer, when
> using the proper compiler and options ;)  Dmd doesn’t optimize very
> well here.
>
> I think LLVM performs quite admirably here and I am glad ldc uses it
> for a backend. The thread mentions the optimizations used for each
> compiler (ldc uses the same options as dmd).
>
> Just thought I would let people know,
> K.Wilson
>
> P.S. I am not sure if this counts as another “supported language”
> for LLVM yet, but I think it is getting close.
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