Improve subtable selection in parallel_* maps by using higher bits of the key, as suggested by @fowles - issue #53

2026-08-29 16:40:39 +08:00 · 2020-07-09 14:46:23 -04:00
parent 882162cc2a
commit afe1ded1ae
1 changed files with 1 additions and 1 deletions
@@ -3215,7 +3215,7 @@ protected:
    }

    static size_t subidx(size_t hashval) {
-        return (hashval ^ (hashval >> N)) & mask;
+        return ((hashval >> 8) ^ (hashval >> 16) ^ (hashval >> 24)) & mask;
    }

    template <class K>