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Plonky3 keccak memory #1832
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Plonky3 keccak memory #1832
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…w, but still won't work due to not enough auto witgen passes for memory read and write
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Now ready for review as tests all pass. Methodology documented as comments in the
keccak16_memory.asm
file.I have only one optimization in mind, but I'm not sure if it'd speed things up, which will depend on more backend knowledge. Specifically, currently I'm using permutation links to
add_sub
submachine to calculate memory addresses for the input and output (basically adding 4 to the address for each read/write). Theadd_sub
submachine itself is pretty compact and efficient in that it doesn't contain any wasted columns. However, I could instead create regular constraints in the main machine to enforce the add 4 logic. Because currently the address columns are only used in the first and last rows, I can put the carry bit in the second and the second to last rows of these address columns. I'll also need to create byte2 checks for all the calculated input/output addresses, which is currently done in theadd_sub
submachine.The key question remains to be answered is whether it's cheaper to do many permutation links or to move everything to "native" constraint in the main machine. The actual number of constraints will be similar in either cases, it's just where we do them.
Either way we go, I think we should approve this PR as is first, because it's currently functioning and is ready for benchmarking. Any optimization mentioned I can do it in another PR.