optimise fq non residue mul #24

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shramee wants to merge 1 commit into paritytech:master from shramee:optimise-fq_non_residue_mul

shramee commented Jan 18, 2024

Added mul_by_nonresidue() on impl Fq
mul_by_nonresidue() returns additive inverse
- (q - 1) is a quadratic nonresidue in Fq
- q - 1 ≡ - 1 and hence the additive inverse
Replaced <Fq> * fq_non_residue() calls by <Fq>.mul_by_nonresidue()
This basically replaces an M cost with an S (SubNC) cost.


          optimise fq non residue mul

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