russell@unturf.com afb5616843 asm: native hash-set + benchmark — 15-21x over portable ...

Adds 6 hash-set builtins (make-hash-set, hash-set?, hash-set-add!,
hash-set-contains?, hash-set-size, hash-set->list). Same sentinel
scheme as hash-table but tag word = -2 (hash-table is -1, vector
is >= 0). One cons cell per entry (vs two for hash-table) since
a set stores keys only — that's where the speedup over the Scheme-
level vector-based ht-* lib comes from.

Benchmark (tests/bench-hashset.sh, via make bench-hashset),
N=5000, i5-8350U asm tier:

                portable   native   speedup
  insert        ~130 ms    ~7 ms    ~20x
  hit-lookup    ~125 ms    ~8 ms    ~15x
  miss-lookup   ~240 ms    ~12 ms   ~20x

Portable is the ht-* lib from proof-netspace-server-lib.lsp
(vectors + cons chains + modulo, pure Scheme). Native replaces
the Scheme-level bucket walk with an asm loop that dereferences
pairs directly — no env lookups, no frame building per iteration.

All 137 asm + 189 functional (Python + C) tests still green.

2026-04-18 06:15:21 -04:00

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