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- Introduce chimera hybrid engine of Hyperscan and PCRE, to fully support
PCRE syntax as well as to take advantage of the high performance nature of
- New API feature: logical combinations (AND, OR and NOT) of patterns in a
given pattern set.
- Windows porting: hsbench, hscheck, hscollider and hsdump tools now available
on Windows 8 or newer.
- Improve undirected graph implementation to avoid graph copy and reduce
- Bugfix for issue #86: enable hscollider for installed PCRE package.
- Introduced hscollider pattern testing tool, for validating Hyperscan match behaviour against PCRE.
- Introduced hscheck pattern compilation tool.
- Introduced hsdump development tool for producing information about Hyperscan pattern compilation.
- New API feature: extended approximate matching support for Hamming distance.
- Bugfix for issue #69: Force C++ linkage in Xcode.
- Bugfix for issue #73: More documentation for
- Bugfix for issue #78: Fix for fat runtime initialisation when used as a shared library.
- New API feature: stream state compression. This allows the user to compress and restore state for streams to reduce memory usage.
- Many improvements to literal matching performance, including more support for Intel(R) Advanced Vector Extensions 512 (Intel(R) AVX-512).
- Compile time improvements, mainly reducing compiler memory allocation. Also results in reduced compile time for some pattern sets.
- Bugfix for issue #62: fix error building Hyperscan using older versions of Boost.
- Small updates to fix warnings identified by Coverity.
- Bugfix for issue #56: workaround for gcc-4.8 C++11 defect.
- Bugfix for literal matching table generation, reversing a regression in performance for some literal matching cases.
- Bugfixes for hsbench, related to multicore benchmarking, portability fixes for FreeBSD, and clarifying output results.
- CMake: removed a duplicate else branch that causes very recent (v3.9) builds of CMake to fail.
- New API feature: approximate matching using the "edit distance" extended
parameter. This allows the user to request all matches that are a given edit
distance from an exact match for a pattern.
- Initial support for Intel(R) Advanced Vector Extensions 512 (Intel(R)
AVX-512), disabled by default. To enable it, pass
- Major compile time improvements in many subsystems, reducing compile time
significantly for many large pattern sets.
- Internal reworking of literal matchers to operate on literals of at
most eight characters, with subsequent confirmation done in the Rose
interpreter. This reduces complexity and bytecode size and improves
performance for many pattern sets.
- Improve performance of the FDR literal matcher front end.
- Improve bucket assignment and other heuristics governing the FDR literal
- Improve optimisation passes that take advantage of extended parameter
- Introduce further lookaround specialisations to improve scanning performance.
- Optimise Rose interpreter construction to reduce the length of programs
generated in some situations.
- Remove the old "Rose" pattern decomposition analysis pass in favour of the
new "Violet" pass introduced in Hyperscan 4.3.0.
- In streaming mode, allow exhaustion (where the stream can no longer produce
matchers) to be detected in more situations, improving scanning performance.
- Improve parsing of control verbs (such as
(*UTF8)) that can only occur at
the beginning of the pattern. Combinations of supported verbs in any order
are now permitted.
- Update version of PCRE used by testing tools as a syntax and semantic
reference to PCRE 8.40.
- Tuning support for Intel(R) microarchitecture code names Skylake, Skylake
- CMake: when building a native build with a version of GCC that doesn't
recognise the host compiler, tune for the microarch selected by
- CMake: don't fail if SQLite (which is only required to build the
tool) is not present.
- CMake: detect libc++ directly and use that to inform the Boost version
- Bugfix for issue #51: make the fat runtime build wrapper less fragile.
- Bugfix for issues #46, #52: use
sqlite3_errmsg()to allow SQLite 3.6.x to
be used. Thanks to @EaseTheWorld for the PR.
- Bugfixes to fix issues where stale data was being referenced in scratch memory. In particular this may have resulted in hs_close_stream() referencing data from other previously scanned streams. This may result in incorrect matches being been reported.
- Introduce the "fat runtime" build. This will build several variants of the
Hyperscan scanning engine specialised for different processor feature sets,
and use the appropriate one for the host at runtime. This uses the "ifunc"
indirect function attribute provided by GCC and is currently available on
Linux only, where it is the default for release builds.
- New API function: add the
hs_valid_platform()function. This function tests
whether the host provides the SSSE3 instruction set required by Hyperscan.
- Introduce a new standard benchmarking tool, "hsbench". This provides an easy
way to measure Hyperscan's performance for a particular set of patterns and
corpus of data to be scanned.
- Introduce a 64-bit GPR LimEx NFA model, which uses 64-bit GPRs on 64-bit
hosts and SSE registers on 32-bit hosts.
- Introduce a new DFA model ("McSheng") which is a hybrid of the existing
McClellan and Sheng models. This improves scanning performance for some
- Introduce lookaround specialisations to improve scanning performance.
- Improve the handling of long literals by moving confirmation to the Rose
interpreter and simplifying the hash table used to track them in streaming
- Improve compile time optimisation for removing redundant paths from
- Build: improve support for building with MSVC toolchain.
- Reduce the size of small write DFAs used for small scans in block mode.
- Introduce a custom graph type (
ue2_graph) used in place of the Boost Graph
adjacency_listtype. Improves compile time performance and type
- Improve scanning performance of the McClellan DFA.
- Bugfix for a very unusual SOM case where the incorrect start offset was
reported for a match.
- Bugfix for issue #37, removing execute permissions from some source files.
- Bugfix for issue #41, handle Windows line endings in pattern files.
- Bugfix for issue #39. This small change is a workaround for an issue in Boost 1.62. The fix has been submitted to Boost for inclusion in a future release.
- Bugfix for issue #30. In recent versions of Clang, a write to a variable was being elided, resulting in corrupted stream state after calling hs_reset_stream().