Module hash 

SIMD-optimized hash functions for key-value store operations.

This module provides fast hash functions optimized for short string keys, with automatic SIMD dispatch (AVX-512 → AVX2 → SSE2 → Scalar).

Example

use trueno::hash::{hash_key, hash_keys_batch};

// Single key hash
let h = hash_key("hello");
assert_ne!(h, 0);

// Batch hash (SIMD-optimized)
let keys = ["a", "b", "c", "d"];
let hashes = hash_keys_batch(&keys);
assert_eq!(hashes.len(), 4);

Performance

• Single key: ~2-5ns (FxHash-equivalent)
• Batch (8 keys): ~10-15ns with AVX2 (vs ~20-40ns sequential)
• Batch (16 keys): ~15-20ns with AVX-512

Functions

hash_bytes

Hash raw bytes to u64.

hash_key

Hash a single key to u64.

hash_keys_batch

Hash multiple keys in batch (SIMD-optimized).

hash_keys_batch_with_backend

Hash multiple keys with explicit backend selection.