# Vectorscan Change Log

This is a list of notable changes to Vectorscan, in reverse chronological order. For Hyperscan Changelog, check CHANGELOG.md

## [5.4.12] 2025-07-21

Multiple changes since last release, this will be the last 100% ABI and API compatible with Hyperscan release.
Next versions will include major refactors and API extensions, it will be mostly backwards compatible however.
Without particular order, platform support is now:

* Linux (x86, Arm, Power)
* FreeBSD 14 (x86, Arm, Power)
* MacOS 14+ (x86, Arm)

In total more than 200 configurations in the CI are tested for every PR.

Other features:
- Fat Runtime supported for Arm as well (ASIMD/SVE/SVE2).
- Initial implementations for Arm SVE/SVE2 algorithms added, thanks to Yoan Picchi from Arm.
- SIMDe support added, used as an alternative backend for existing platforms, but mostly interesting for allowing Vectorscan to build in new platforms without a supported SIMD engine.
- Various speedups and optimizations.
- Cppcheck and clang-tidy fixes throughout the code, both have been added to CI for multiple configurations, but only cppcheck triggers a build failure for now.

Various bugfixes, most important listed:
- Speed up truffle with 256b TBL instructions (#290)
- Fix Clang Tidy warnings (#295)
- Clang 17+ is more restrictive on rebind<T> on MacOS/Boost, remove warning (#332)
- partial_load_u64 will fail if buf == NULL/c_len == 0 (#331)
- Bugfix/fix avx512vbmi regressions (#335)
- fix missing hs_version.h header (closes #198)
- hs_valid_platform: Fix check for SSE4.2 (#310)
- Fixed out of bounds read in AVX512VBMI version of fdr_exec_fat_teddy … (#333)
- Fix noodle SVE2 off by one bug (#313)
- Make vectorscan accept \0 starting pattern (#312)
- Fix 5.4.11's config step regression (#327)
- Fix double shufti's vector end false positive (#325)

## [5.4.11] 2023-11-19

- Refactor CMake build system to be much more modular.
- version in hs.h fell out of sync again #175
- Fix compile failures with recent compilers, namely clang-15 and gcc-13
- Fix clang 15,16 compilation errors on all platforms, refactor CMake build system #181
- Fix signed/unsigned char issue on Arm with Ragel generated code.
- Correct set_source_files_properties usage #189
- Fix build failure on Ubuntu 20.04
- Support building on Ubuntu 20.04 #180
- Require pkg-config during Cmake
- make pkgconfig a requirement #188
- Fix segfault on Fat runtimes with SVE2 code
- Move VERM16 enums to the end of the list #191
- Update README.md, add CHANGELOG-vectorscan.md and Contributors-vectorscan.md files

## [5.4.10] 2023-09-23
- Fix compilation with libcxx 16 by @rschu1ze in #144
- Fix use-of-uninitialized-value due to getData128() by @azat in #148
- Use std::vector instead of boost::container::small_vector under MSan by @azat in #149
- Feature/enable fat runtime arm by @markos in #165
- adding ifndef around HS_PUBLIC_API definition so that vectorscan can be statically linked into another shared library without exporting symbols by @jeffplaisance in #164
- Feature/backport hyperscan 2023 q3 by @markos in #169
- Prepare for 5.4.10 by @markos in #167

## [5.4.9] 2023-03-23
- Major change: Enable SVE & SVE2 builds and make it a supported architecture! (thanks to @abondarev84)
- Fix various clang-related bugs
- Fix Aarch64 bug in Parser.rl because of char signedness. Make unsigned char the default in the Parser for all architectures.
- Fix Power bug, multiple tests were failing.
- C++20 related change, use prefixed assume_aligned to avoid conflict with C++20 std::assume_aligned.

## [5.4.8] 2022-09-13
- CMake: Use non-deprecated method for finding python by @jth in #108
- Optimize vectorscan for aarch64 by using shrn instruction by @danlark1 in #113
- Fixed the PCRE download location by @pareenaverma in #116
- Bugfix/hyperscan backport 202208 by @markos in #118
- VSX optimizations by @markos in #119
- when compiling with mingw64, use __mingw_aligned_malloc() and __mingw_aligned_free() by @liquidaty in #121
- [NEON] simplify/optimize shift/align primitives by @markos in #123
- Merge develop to master by @markos in #124

## [5.4.7] 2022-05-05
- Fix word boundary assertions under C++20 by @BigRedEye in #90
- Fix all ASAN issues in vectorscan by @danlark1 in #93
- change FAT_RUNTIME to a normal option so it can be set to off by @a16bitsysop in #94
- Optimized and correct version of movemask128 for ARM by @danlark1 in #102

## [5.4.6] 2022-01-21
- Major refactoring of many engines to use internal SuperVector C++ templates library. Code size reduced to 1/3rd with no loss of performance in most cases.
- Microbenchmarking tool added for performance finetuning
- Arm Advanced SIMD/NEON fully ported. Initial work on SVE2 for a couple of engines.
- Power9 VSX ppc64le fully ported. Initial port needs some optimization.
- Clang compiler support added.
- Apple M1 support added.
- CI added, the following configurations are tested on every PR:
  gcc-debug, gcc-release, clang-debug, clang-release:
  Linux Intel: SSE4.2, AVX2, AVX512, FAT
  Linux Arm
  Linux Power9
  clang-debug, clang-release:
  MacOS Apple M1