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I believe it is just lacking aggressive optimization. ARM is basically RISC as well, so it isn't an architectural limitation.



(Naive question) then is it really a big hurdle for a company who knows how to make arm chips to try making riscv chips?


The question is more of will your customers agree to go along with this major architectural shift that sets you back on price-performance-power curves by at least five years and moves you out of the mainstream of board support packages, drivers, and everything else software-wise for phones.

Also we should not pretend that ARM is just going to sit there waiting for RISC-V to catch up.


> The question is more of will your customers agree to go along with this major architectural shift that sets you back on price-performance-power curves by at least five years and moves you out of the mainstream of board support packages, drivers, and everything else software-wise for phones.

Embedded is moving to RISC-V where they have low performance needs.

One example is the Espressif line of CPUs - which have shipped over 1B units. They have moved most of their offerings to RISC-V over the last few years and they are very well supported by dev tools: https://www.espressif.com/en/products/socs


Yes. This caveat is most clear. I am wondering about the question of performance raised in this thread,


It’s not a big hurdle so long as they hire Jim Keller to rapidly improve yet another architecture. (Only half-joking.)


Jim Keller is actually working on this right now at Tenstorrent.


Ascalon (claiming Zen5-tier performance) is done, and has been available for licensing for about a year now.

It was then made public that LG bought a license right away.


It’s easy to claim a lot of things.


>It’s easy to claim a lot of things.

It certainly is easy to casually spread fear and doubt.

But it is really far-fetched to think that the people at Tenstorrent, who have successfully delivered very high performance microarchitectures in other companies before, are lying about Ascalon, and that LG is helping them do that.

It would even be more far fetched to claim that Ventana Veyron V2, SiFive P870, Akeana 5000-series, all of them available high performance IP, are lying about performance.


I suspect not? I think the principles and methods of optimization are the same.

But I say this as a software guy who doesn't actually know CPU design.


Making the chip isn’t an issue for them. It’s the software compatibility post facto.


Well you need several years to catch up - and those doing arm are not standing still. Same problem big software rewrites have, some are successful but it takes a large investment while everyone is still using the old stuff that is better for now.




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