10:29:16 <lkcl> folks we're adding some very weird (innovative) instructions to draft svp64 which i believe may be of interest, and could use some help evaluating
10:29:21 <lkcl> https://libre-soc.org/openpower/sv/bitmanip/#grevlut
10:29:35 <lkcl> and binlut / crternlogi
10:30:14 <lkcl> AVX-512 first added ternlogd, but you'll notice that it has a fixed immediate
10:30:38 <lkcl> that makes it only possible to use via JIT-compilation
10:31:46 <lkcl> whereas binlut+crternlogi can be used to perform binary and ternary lookups *interpreted* - because the decision about what to do (the LUT2/LUT3) comes from a register, not an immediate
10:32:40 <sech1> "a means to set hundreds of regular 64 bit patterns with one single 32 bit instruction."
10:32:48 <sech1> hmm, thinking how it could be used in RandomX
10:34:04 <lkcl> appreciated. Tim Forsyth's video on AVX-512/Larabee he said it was inspired by FPGA LUTs
10:34:20 <lkcl> but the trick he missed was in making only an immediate variant
10:36:12 <lkcl> its advantage is that if you have say a parallel batch of any type of or/and/nor/nand/xor/xnor/literally-anything logic table, you can do up to 64 in one single instruction
10:37:35 <sech1> RandomX has only NEG, XOR and ROR/ROL instructions. So if several of them can be combined together if they operate on the same dest register?
10:38:32 <lkcl> sech1, i'm looking at this now, and am surprised that only XOR was added (not NAND or AND or OR etc.) https://github.com/tevador/RandomX/blob/master/doc/specs.md
10:39:32 <lkcl> NEG could be done as "bit-invert followed by add 1" so binlut could be used there
10:40:01 <lkcl> i think it highly likely it could be used for ISWAP_R as well
10:40:33 <sech1> AND/OR reduce entropy too much (too many 0 or 1 bits in the result)
10:40:38 <sech1> some for NAND
10:41:24 <lkcl> ISWAP_R could be done using the triple-XOR trick
10:42:02 <lkcl> but hmm honestly my feeling is, you could just use standard XOR instructions!
10:42:09 <lkcl> good point
10:43:46 <lkcl> hmmm :)
10:45:18 <lkcl> sech1, appreciate the thoughts and guidance. thank you
13:28:53 <mightysnowman[m]> Does anyone else get "Invalid token" when registering for xmrvsbeast raffle?
22:42:43 <xmrvsbeast[m]> are you leaving token field blank when you register?