Re: [f-cpu] Winograd DCT on my seul.org account

[djrom <pash.cracken@free.fr>]

>Juergen Goeritz wrote:
>> Hi!
>> 
>> this is indeed a very, very  convincing idea! Provide the
>> 'fitter' for the processor with the processor. YESSS!

>i'm happy to see that this idea is not so hallucinating for
>at least someone ;-) maybe you like it because you're also
>a "HW guy" but the important thing is to have the benefits
>and let people understand how that works.

i find this idea very nice, too. at least two persons :-) !

>> <compare to vhdl>
>> It would be similar to todays FPGAs tool chains!
>> You can use a 'global tool' like synplicity or whatever
>> and run the device fitter from the vendor to create
>> fpga netlist.
>> </compare to vhdl>

>very nice comparison, even though i didn't think about it :-)

>However this creates a new kind of problems : gcc should export
>the whole Intermediate Representation instead of just register-wise
>code, because register reallocation works best on program-wise
>working sets. Usually, FPGA/ASIC synthesiser + fitter exchange data
>in the form of a flattened netlist, but GCC outputs code
>that almost looks like already-fitted code.

>> Now you take gcc (or the ones for ada, f, pas and so on)
>> and run the f-cpu optimization fitter as a second step.
>> And I would love to see the optimization procedure as a
>> part of the loader...
>that's ADA/VHDL-like, no ? :-P

>> Then there were the chance for portability at maxperf.
>> And you wouldn't have to worry about f-cpu type during
>> compilation...
>but then your "distibuted binaries" would be some kind of IR, 
>not executable code. what happens if you want to compile
>a boot loader or a boot kernel ? (i guess the answer but
>i ask you anyway)

>> And the hardware guys must think about how software is
>> to be optimized - what amount of synergy effects :-)
>> 
>> And finally I don't see problems using gcc as a frontend
>> tool only.

>me either : that's what it simply is.
sure. and I always fall in love for KISS ideas :-)

>> JG
>WHYGEE

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