llvm dev - Oct 2008 - [LLVMdev] ldc (LLVM backend for the D Programming Language) has x86-64 support

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)"

 

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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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.
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Maybe we could get LDC added to the "User List", under "Open
Source
Projects"?

""
LDC - LLVM D Compiler
Compiler for the D programming language using LLVM as backend.
http://www.dsource.org/projects/ldc
""

Something like that :)

On Tue, Oct 28, 2008 at 7:32 AM, Chris Lattner <clattner at apple.com>
wrote:
>
> 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.
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
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