Fast, non-cryptographic hash used by rustc and Firefox.
use rustc_hash::FxHashMap; let mut map: FxHashMap<u32, u32> = FxHashMap::default(); map.insert(22, 44);
A speedy hash algorithm for use within rustc. The hashmap in liballoc by default uses SipHash which isn’t quite as speedy as we want. In the compiler we’re not really worried about DOS attempts, so we use a fast non-cryptographic hash.