| 1 Aug 2025 |
 emily | https://msyksphinz-self.github.io/riscv-isadoc/html/rvi.html is this really every single instruction in RV32I | 12:15:15 |
 dramforever | In reply to @emilazy:matrix.org
"This is why LoongArch is better than RISC-V and also why the author of LoongArch does not like RISC-V and creates this new ISA." you saw that on reddit? that post was like, almost convincing in the opposite direction | 12:15:20 |
 K900 | Yes | 12:15:30 |
| dramforever | there has been a few really weird posts on r/riscv on this | 12:15:48 |
| emily | it has arithmetic right shift but not left shift. non-orthogonal. | 12:15:52 |
| emily | yes and I also saw the comments #debunking it | 12:16:01 |
| dramforever | addi but no subi | 12:16:18 |
| emily | but it does feel like the most baseline RISC-V architectures are like basically useless | 12:16:21 |
| emily | I guess you use them when you want to use five gates on your FPGA to implement 10 lines of logic | 12:16:37 |
| emily | and you want to do it in C for some reason | 12:16:48 |
| dramforever | rva20/rv64gc is painful | 12:16:59 |
| dramforever | rva22 is about right for now i think | 12:17:13 |
| dramforever | rva23 we'll see in 2030 | 12:17:21 |
| emily | RV64GC, adds the hardware garbage collection collection | 12:17:24 |
| emily | isn't Ubuntu dropping support for anything but RVA23 | 12:17:32 |
| dramforever | by that i mean if the sw ecosystem evolved reasonably | 12:17:48 |
| dramforever | In reply to @emilazy:matrix.org
isn't Ubuntu dropping support for anything but RVA23 i've been trying to start a meme about which of rva23 hw and silksong will be available first | 12:18:33 |
| emily | or is the government just throwing boards at people to subsidize upstreaming or something but you can't actually buy a laptop | 12:18:35 |
| emily | personally I think it will be cool if there is an Ubuntu ISO that you cannot run on any hardware publicly-available on the market | 12:19:06 |
| dramforever | no you can just buy it on aliexpress | 12:19:10 |
| dramforever | it's less easy to buy because less demand and maaaybe sanctions? i don't know if any sanctions stop loongson from selling abroad | 12:20:24 |
| dramforever | but it certainly isn't helping their business in general | 12:20:35 |
| emily | I assume it also just does not perform well for the price | 12:21:19 |
| emily | if you have access to normal CPUs | 12:21:24 |
| dramforever | it is fine https://chipsandcheese.com/p/loongson-3a6000-a-star-among-chinese-cpus | 12:21:51 |
| dramforever | like, very usable | 12:22:06 |
| emily | huh | 12:22:27 |
| emily | this is a lot better than I expected | 12:22:30 |
| dramforever | i don't know what price you'll get though | 12:22:39 |
| emily | isn't this like better than basically any RISC-V thing | 12:22:41 |
