On 25.12.2012 12:55, Marco van de Voort wrote:
In our previous episode, Sven Barth said:
and linked about 10 times as fast as FPC.
AFAIK Delphi's command line compiler does not allow you to skip the
assembling and linking phase, so the fairest comparison would be to
compare the compilation of a single unit as there the linking phase is
skipped. If Delphi is still better there then there are two
possibilities: improve the internal assembler or the parser/code
generator. Please keep in mind though that FPC's code generator is
written in such a way that the backend can be switched rather easily. As
we learned with the developer's blog entries about Delphi XE2 this
wasn't the case with Delphi XE and older. So it could be that you can
never reach the speed of Delphi 7's compiler as FPC is more portable.
The numbers Martin names (up till 10 times slower, even without linking) are
the numbers I have in mind too. IMHO denial without tests is unfair.
I'm not denying them, I'd just like to what the performance of the
phases of the compiler is compared to the corresponding phases of the
Delphi compiler. Then we can optimize that part. Or if it comes out that
the problem is that we are more platform independant than e.g. Delphi 7
than we can either try to improve other parts of the compiler or we are
simply out of luck, because this platform independance is the main
benefit of Free Pascal and I believe not many users are willing to give
that up...
When I'm home after Christmas I'll play a bit and see if I can duplicate the
experiments with Delphi XE3.
Yes, XE3 numbers would definitely be welcome. If possible could you also
compare x86_64 of XE3 and FPC?
Regards,
Sven
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