Speed up MSMs for non-GPU accelerated MSMs and architectures that don't support GPU/semolina #126
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Nov 22, 2023
* Simplify Group trait (microsoft#259) * simplify Group trait * fix clippy * further simplifications * fix Copy * Cut duplicate code (microsoft#261) * cut duplicate code * bound --> bind for clarity * expose asm feature * test: check test_pp_digest with asm feature in CI * expose size of the base field (microsoft#262) * fix: add mention of halo2curves issue explaining the problem --------- Co-authored-by: Srinath Setty <srinath@microsoft.com>
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Adds fast, parallelisable MSM for compile targets that aren't supported by pasta_msm/semolina. Also uses fast MSM on small MSMs (smaller than 128 size) for all architecture since I'm on my laptop a size 128 MSM is ~3x faster with this code vs. the old non Pippengers code.
The multiexp code is taken from https://github.com/zcash/halo2/blob/main/halo2_proofs/src/arithmetic.rs, all credits to authors there!
Tested end to end with this branch of Nova Scotia: https://github.com/nalinbhardwaj/Nova-Scotia/tree/browser
Follow up from discussion here: #125 (comment)