Orkuncakilkaya
2002e977d9
Some checks are pending
docs / build-and-deploy (push) Waiting to run
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>
27 lines
1,016 B
Markdown
27 lines
1,016 B
Markdown
---
|
|
id: hash-mix64
|
|
name: Hash.mix64
|
|
category: hash
|
|
kind: namespace-method
|
|
tokens: Hash.mix64
|
|
sig: Hash.mix64(x) -> long
|
|
tip: Avalanche one 64-bit integer into a well-scrambled value.
|
|
order: 8
|
|
ns: Hash
|
|
member: mix64
|
|
---
|
|
|
|
The 64-bit counterpart of <a href="hash-mix"><code>Hash.mix</code></a>: the <a href="https://en.wikipedia.org/wiki/MurmurHash">MurmurHash3</a> <code>fmix64</code> finalizer (shift by 33, multiply, repeat). It thoroughly scrambles a <code>long</code>, so consecutive or structured inputs map to unrelated-looking outputs — ideal for turning a large counter, packed coordinate, or 64-bit id into a random-looking seed. An <code>int</code> argument widens to 64 bits first. Deterministic; <code>Hash.mix64(0)</code> is <code>0</code>.
|
|
|
|
Parameters:
|
|
- `x` — the integer to avalanche (widened to `long`)
|
|
|
|
```ludic
|
|
program Seeds64 {
|
|
entry {
|
|
let base: long = Hash.of64("chunk")
|
|
print(Hash.mix64(base))
|
|
print(Hash.mix64(base + 1)) # a neighbouring input -> an unrelated seed
|
|
}
|
|
}
|
|
```
|