ludic/docs/language/hash/hash-mix.md
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feat(lang,stdlib): 64-bit long type + 64-bit Hash variants (issue #17)
Add `long`, a 64-bit signed integer primitive (i64), threaded through
codegen: llty; int<->long coercion (coerce_code/to_long) at let/assign/
return/call-args; i64 arithmetic + comparison promotion in emit_bin;
unary negate/~; print via %lld and str()/interpolation via @fn_long_str.
Editor vocabulary (syntax header, TextMate grammar, formatter, LSP)
synced; check-vocabulary green. Numeric literals stay i32 — build large
values by widening (documented on the type page).

Complete the Hash.* namespace (issue #17) with both 32- and 64-bit
algorithms: Hash.of/fnv1a/crc32/mix/combine (32-bit) and
Hash.of64/fnv1a_64/mix64 (64-bit, returning long). Deterministic and
C-free; CRC-32 (poly 0xEDB88320) and FNV vectors verified against
reference implementations.

Tests: selfhost/tests/{hash,long}.ludic. Docs: docs/language/hash/*,
type-long.md. Seed reseeded; C-free bootstrap fixpoint holds; 23
selfhost + 45 regression + 29 tooling checks green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-30 01:01:06 +03:00

1 KiB

id name category kind tokens sig tip order ns member
hash-mix Hash.mix hash namespace-method Hash.mix Hash.mix(x) -> int Avalanche one integer into a well-scrambled value. 4 Hash mix

Scrambles a single integer so its bits are thoroughly mixed — the MurmurHash3 fmix32 finalizer (shift/multiply/shift). Nearby inputs like 0, 1, 2 map to values that look unrelated, which is exactly what you want when turning a counter, entity id, or frame number into a random-looking seed. It is deterministic and self-inverse-free: the same input always gives the same output. Hash.mix(0) is 0. For folding several numbers together use Hash.combine.

Parameters:

  • x — the integer to avalanche
program Seeds {
  entry {
    var i = 0
    while i < 4 {
      print(Hash.mix(i))   # consecutive counters -> unrelated-looking seeds
      i = i + 1
    }
  }
}