Tentative: Fp2 and towering optimizations #462
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Similar to elliptic curve in #446, towering has a perf discrepancy. Performance degrades compared to ideal given base field performance.
This is a (failed) tentative to address that. Unfortunately this simple approach doesn't change perf so a more radical approach might be needed (having full fixed assembly).
Still keeping the branch around as it has useful handlers for Nim vs C arrays differences that need to be accomodated in inline assembly.