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murmur

2.0.2
2.0.2 2.0.1 2.0.0 1.0.4 1.0.3 1.0.1 1.0.0 0.2.1 0.2.0 0.1.2 0.1.1 0.1.0

Murmur is a pure Elixir implementation of the non-cryptographic hash Murmur3. It aims to implement the x86_32bit, x86_128bit and x64_128bit variants.

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CHANGELOG.md 

# Changelog



## 2.0.2 (2026-09-03)



### Added

- Comprehensive test coverage for block and tail boundary vectors (0 to 33 bytes) across all Murmur3 variants.

- Regression tests verifying Erlang term hashing against serialized binary representations.



### Changed

- Optimized tail processing in 128-bit hashes (`Murmur.Hash128X86` and `Murmur.Hash128X64`) by decoding 32-bit and 64-bit integers directly via binary pattern matching, eliminating intermediate tail splitting.

- Added fast-path early exit for empty tails in 128-bit hashes.

- Inlined hot arithmetic, round mixing, and intermixing functions in 128-bit hash implementations.

- Streamlined dispatch in the top-level `Murmur` module to directly invoke hash implementations for binary inputs.

- Simplified tail termination in `Murmur.Hash32X86` with direct empty binary pattern matching.

- Standardized binary pattern matching to canonical bit syntax (`32-little`, `64-little`).

- Updated documentation examples, local benchmark scripts, and benchmark results in `README.md`.



### Removed

- Removed unused and orphaned helper functions from `Murmur.Helpers` (`fmix32/1`, `fmix64/1`, `swap_uint/1`, `k_32_op/4`, `k_64_op/4`, `rotl32/2`, `rotl64/2`, `bxor_and_shift_right/2`).

- Removed redundant masking operations and constant function arguments in internal round helpers.



## 2.0.1 (2026-08-19)



### Changed

- Reduced allocations in the 128-bit hash implementations by replacing fixed-size

  collection pipelines with direct state handling.

- Improved hashing performance and memory usage with compiler-guided arithmetic

  optimizations while preserving existing hash results.



## 2.0.0 (2024-07-26)



## Breaking changes

- Refactor and fix 128-bit results according to the original (SMHasher) version,

  this fixes the issue with the 128-bit results being incorrect, but it also means

  that the 128-bit results are not compatible with the previous version of the library,

  therefore the version has been bumped to 2.0.0.



## 1.0.4 (2024-07-22)



### Changed

- Stopped testing against Erlang terms due to potential inconsistencies between Erlang versions.

- Fixed compiler warnings.



## 1.0.3 and earlier



- See the Git history for changes prior to 1.0.4