D programs broken at Language Shootout

[Bradley Smith]

Dave wrote:
> Frits van Bommel wrote:
>> kmk wrote:
>>> == Quote from Christof Boeckler (post06 at jamesie.de)'s article
>>>> kmk schrieb:
>>>>> "I did that last night and it looks to be fixed already."
>>>>>
>>>>> Yes, D is back to #3
>>>> Strange though that on the AMD Sempron machine (see
>>>> http://shootout.alioth.debian.org/debian/) DMC is even #1 with quite a
>>>> gap between C and C++.
>>>>> I tried to get them to add GDC but they said it was too much work.
>>>
>>> Yeah, D has always seemed to do better on AMD processors.
>>
>> Maybe Walter uses AMD and uses measurements on his dev PC for 
>> optimization decisions? :)
> 
> I think it's because AMD has a shorter pipeline (like the Intel PIII and 
> new Intel Core 2) and isn't so sensitive to cache alignment issues, etc. 
> The DMC backend optimizer was probably last enhanced when the PIII was 
> the hot chip <g>
> 
> Funny thing is that since Walter didn't chase the P4, now his compiler 
> optimizer might sitting pretty for Core 2 :)
> 
> Anyone running a Core 2 system and have a little time? Might be 
> interesting...

The Shootout appears to be using different implementations for the 
Pentium 4 and Sempron benchmarks. Compare the programs at the following 
URLs:

http://shootout.alioth.debian.org/debian/benchmark.php?test=regexdna&lang=dlang

http://shootout.alioth.debian.org/gp4/benchmark.php?test=regexdna&lang=dlang

One is using std.regexp, and the other isn't.