5171cc76c2
perf: buffer SipHasher128 This is an attempt to improve Siphasher128 performance by buffering input. Although it reduces instruction count, I'm not confident the effect on wall times, or lack-thereof, is worth the change. --- Additional notes not reflected in source comments: * Implementation choices were guided by a combination of results from rustc-perf and micro-benchmarks, mostly the former. * ~~I tried a couple of different struct layouts that might be more cache friendly with no obvious effect.~~ Update: a particular struct layout was chosen, but it's not critical to performance. See comments in source and discussion below. * I suspect that buffering would be important to a SIMD-accelerated algorithm, but from what I've read and my own tests, SipHash does not seem very amenable to SIMD acceleration, at least by SSE. |
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| .. | ||
| base_n | ||
| binary_search_util | ||
| graph | ||
| obligation_forest | ||
| owning_ref | ||
| sip128 | ||
| small_c_str | ||
| snapshot_map | ||
| sorted_map | ||
| sso | ||
| stable_hasher | ||
| tagged_ptr | ||
| tiny_list | ||
| transitive_relation | ||
| atomic_ref.rs | ||
| base_n.rs | ||
| box_region.rs | ||
| captures.rs | ||
| const_cstr.rs | ||
| fingerprint.rs | ||
| flock.rs | ||
| frozen.rs | ||
| fx.rs | ||
| jobserver.rs | ||
| lib.rs | ||
| macros.rs | ||
| map_in_place.rs | ||
| profiling.rs | ||
| ptr_key.rs | ||
| sharded.rs | ||
| sip128.rs | ||
| small_c_str.rs | ||
| sorted_map.rs | ||
| stable_hasher.rs | ||
| stable_map.rs | ||
| stable_set.rs | ||
| stack.rs | ||
| svh.rs | ||
| sync.rs | ||
| tagged_ptr.rs | ||
| temp_dir.rs | ||
| thin_vec.rs | ||
| tiny_list.rs | ||
| transitive_relation.rs | ||
| unhash.rs | ||
| vec_linked_list.rs | ||
| work_queue.rs | ||