<gurki>
thats mostly a collection of guesses and wishes :s
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<solrize>
yep, 2x die shrink lol
<jrtc27>
only die shrink will be from losing features
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<muurkha>
could happen
<jrtc27>
I mean genuinely
<jrtc27>
where does that savings come from?
<jrtc27>
x86->arm is non-crazy decode
<jrtc27>
and weirdo legacy crud
<jrtc27>
what does arm have that riscv doesn't that adds significant area?
<jrtc27>
(that isn't important for a modern high-perf core?)
<muurkha>
I haven't ever written a core for either one
<muurkha>
so probably this is dumb, but
<muurkha>
"modern high-performance" probably implies 64-bit, which means aarch64, which means no compressed instructions
<muurkha>
in RAM anyway
<muurkha>
it would be kind of awesome if someone built a compressed icache for aarch64 using a C-like approach, but AFAIK nobody has
<muurkha>
plausibly you can get by without op fusion for longer with RV64 than for aarch64, but you definitely want it pretty early on
<muurkha>
but like I said I don't know much of anything so I could have all of that backwards
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<dh`>
jrtc27: a java bytecode mode?
<dh`>
(for example. arm seems to have a lot of things like that)
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<jrtc27>
that's been dead for years
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<jrtc27>
good luck finding a modern high-perf arm core with that
<dh`>
enclaves? (which I can't remember what arm calls them)
<dh`>
idk, it seems like there's been a long parade of questionable features over the last maybe ten years and arm has nearly as many as x86
<jrtc27>
secure world and realms
<jrtc27>
which riscv is adding its equivalent of (:
<jrtc27>
ah trustzone
<jrtc27>
that's the word
<dh`>
right, that sounds right
<dh`>
anyway it seems like the arm architecture docs being two orders of magnitude larger than the riscv architecture docs is not _just_ because the riscv ones are sometimes too abbreviated and the arm ones badly written and often broadly redundant
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<prabhakarlad>
conchuod: I haven't heard back anything from arnd for the dma unification series (https://www.spinics.net/lists/linux-m68k/msg22199.html). This has been blocking the RZ/Five upstreaming activity now from quite sometime. Should I go back to function pointer way (ie v7 series) and post the patches?
<conchuod>
Well I guess arnd will probably see the pokes here!
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<conchuod>
I guess he has just been busy with other things, cos I don't recall any objections to arnds series.
<prabhakarlad>
okie, I'll wait for arnd to respond on this.
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