Add reciprocal Kronecker multiplication - #9605
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August 25, 2026 04:06
Cost model: KS2 performs two packed integer multiplications at roughly half the KS1 bit width, plus linear packing, signed recovery, and interleaving. Slot width derives from min(size) * maxAbs(p) * maxAbs(q). The crossover sweep keeps this as a forced kernel because it rarely beats the existing KS1 implementation on the current grid.
# Conflicts: # scripts/bench/proof_only_runtime_exemptions.json
# Conflicts: # scripts/bench/proof_only_runtime_exemptions.json
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Implements the SPEC KS3 reciprocal-evaluation kernel in
HexPolyZ:mulKronecker3_eqwithout axioms or sorriesThe restored 276-cell sweep found KS3 slower than KS1 in every stable cell (2.20x median, 1.58x best), so this deliberately remains a forced kernel and does not alter production dispatch. The exact runtime-freshness exemption is valid because that dispatcher and the factorization call graph are unchanged.
Depends on #9602. This targets upstream
mainper repository convention; until #9602 merges, the PR includes its KS2 base commit.