8ad4e1cf31
(keyword #f name) built a fresh combined-key string (string-append) on every call just to do the intern-table lookup — ~80 bytes of garbage per (:kw x), map literal, keyword arg, etc. A no-ns keyword now interns in a table keyed by the name string directly, so a lookup of an already-interned keyword is one hashtable-ref with no allocation. The ns table keeps the combined key; both share the keyword-t khash (equal-hash of the combined key) so hash values are unchanged. Small time win on its own (the field-read dispatch dominates hot record code — see jolt-unx4) but removes per-call keyword allocation everywhere. Runtime .ss, no re-mint; identity/=/hash unchanged, make test green. |
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