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| openpowerbot | [irc] <sadoon[m]1> I assume bigint will introduce some overhead which is avoidable since we can do 5 multiplications and 3 additions in parallel (right?) | 20:28 |
|---|---|---|
| openpowerbot | [irc] <sadoon[m]1> uhh nvm I meant a bigger number that I can't recall now | 20:28 |
| openpowerbot | [irc] <sadoon[m]1> But basically 32-bit is more parallel | 20:28 |
| openpowerbot | [irc] <sadoon[m]1> if bigint will do some tricks to get addition and multiplication | 20:28 |
| openpowerbot | [irc] <programmerjake> but, (assuming it uses the HW optimization I proposed), bigint can do a full 256x64-bit mul per cycle... | 20:29 |
| openpowerbot | [irc] <programmerjake> and a 256-bit add per cycle | 20:29 |
| openpowerbot | [irc] <sadoon[m]1> Huh | 20:29 |
| openpowerbot | [irc] <programmerjake> (those are just throughput, not latency tho) | 20:29 |
| openpowerbot | [irc] <sadoon[m]1> Is it full HW 256-bit or is it 6464.. with additions in between? | 20:30 |
| openpowerbot | [irc] <programmerjake> it is full 256-bit, basically we have a 256-bit adder and when we want a vector of 64-bit non-carrying additions, we disable carries at every 64th bit | 20:31 |
| openpowerbot | [irc] <sadoon[m]1> Oh | 20:31 |
| openpowerbot | [irc] <sadoon[m]1> That's very cool | 20:31 |
| openpowerbot | [irc] <programmerjake> we could also decide to have it be 128-bit not 256-bit if 256 is too big for our core | 20:31 |
| openpowerbot | [irc] <sadoon[m]1> At any rate, 32-bit vs 64-bit implementation will differ only very slightly | 20:32 |
| openpowerbot | [irc] <sadoon[m]1> If I understand how SVP64 works by now, it's literally a change in the setvl and svremap instructions and we're good to go for any size | 20:32 |
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| openpowerbot | [irc] <sadoon[m]1> All thanks to the numbers not depending on each other | 20:33 |
| openpowerbot | [irc] <programmerjake> see the 256x256-bit mul I wrote a few days ago...each of the sv.maddedu or sv.adde ops could each be grouped into one ALU operation. | 20:33 |
| openpowerbot | [irc] <sadoon[m]1> My brain is too fried to look into that now but definitely in another time, awesome | 20:33 |
| openpowerbot | [irc] <programmerjake> https://git.libre-soc.org/?p=openpower-isa.git;a=blob;f=src/openpower/test/bigint/powmod.py;h=fa43ede5bbb2639431dfa2092ac702988e5b5e7b;hb=b80670cfb193d148ff0419a14318e0f63900ef76#l21 | 20:34 |
| openpowerbot | [irc] <sadoon[m]1> Spent 5 hours researching and typing this, sigh | 20:34 |
| openpowerbot | [irc] <programmerjake> well, feel free to take a look tomorrow once your brain is un-fried :) | 20:34 |
| openpowerbot | [irc] <sadoon[m]1> I'll cross-ref this discussion as well, this is important | 20:34 |
| openpowerbot | [irc] <sadoon[m]1> programmerjake: Oh yes definitely, and it's a Tuesday so we can have some discussions in the meeting | 20:35 |
| openpowerbot | [irc] <sadoon[m]1> Oh poop, the matrix bot didn't register the full chat | 20:35 |
| openpowerbot | [irc] <sadoon[m]1> Ah wait nvm, only missed the first 4 comments, not too important | 20:36 |
| openpowerbot | [irc] <sadoon[m]1> I'll add them manually just in case | 20:36 |
| openpowerbot | [irc] <sadoon[m]1> Good night! | 20:38 |
| openpowerbot | [irc] <programmerjake> oh, that's cuz openpowerbot went offline for a bit... | 20:40 |
| openpowerbot | [irc] <programmerjake> gn | 20:40 |
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