Misc questions:- licensing, VC++ IDE compatible, GPGPU, LTCG, QT, SDL

Walter Bright newshound1 at digitalmars.com
Tue May 18 15:03:43 PDT 2010

retard wrote:
> Tue, 18 May 2010 12:13:02 -0700, Walter Bright wrote:
>> %u wrote:
>>> The DMC++ compiler you mentioned sounds interesting too. I'd like to
>>> compare performance with that, the VC++ one, and the Intel compiler.
>> When comparing D performance with C++, it is best to compare compilers
>> with the same back end, i.e.:
>>     dmd with dmc
>>     gcc with gdc
>>     lcc with ldc
>> This is because back ends can vary greatly in the code generated.
> What if I'm using a clean room implementation of D with a custom backend 
> and no accompanying C compiler, am I not allowed to compare the 
> performance with anything?

You're allowed to do whatever you want. I'm pointing out that the difference in 
code generator ability should not be misconstrued as a difference in the languages.

> When people compare C compilers, they usually use the latest Visual 
> Studio, gcc, icc, and llvm versions -- i.e. C compilers from various 
> vendors. Using the same logic one is not allowed to compare dmc against 
> those since it would always lose.

It's perfectly reasonable to compare dmc and gcc for code generation quality.

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