xxHash - Browse /v0.8.4 at SourceForge.net

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Name	Modified	Size	InfoDownloads / Week
Parent folder
xxhsum_win64_v0_8_4.zip	2026-09-19	180.2 kB	5
README.md	2026-09-19	6.8 kB	0
xxHash v0.8.4 source code.tar.gz	2026-09-19	1.2 MB	0
xxHash v0.8.4 source code.zip	2026-09-19	1.2 MB	0
Totals: 4 Items		2.6 MB	5

xxHash v0.8.4 is a general maintenance update, offering broader hardware acceleration, command line enhancements, and more predictable builds across platforms. No change to the API entry points.

Faster performance with vectorization

This release adds several vectorized implementations: for the RISC-V Vector extension and LoongArch LASX, together with improvements to the existing LSX implementation.

On aarch64, XXH3 now prefers NEON over SVE. On tested processors, this improves performance by 25–40%. XXH3 streaming performance has also been improved for workloads made of small updates.

Command-line enhancements

xxhsum can now receive a full 64-bit seed through -s or --seed.

Command-line parsing is more flexible: options may appear anywhere, even after filenames, while -- explicitly terminates option processing.

When processing a list of files, read errors no longer prevent subsequent files from being processed.

Windows support received a substantial update, notably for long paths, UNC paths and filenames containing components that require extended Win32 path handling.

Build and integration

Runtime dispatch detection has been corrected for cross-compilation and non-x86 targets.

make builds now isolate object files by configuration, avoiding accidental reuse across incompatible flag sets and allowing parallel test builds.

The cmake integration moved from cmake_unofficial to build/cmake. Projects referring directly to the previous directory must update that path.

Low-level integrations can now redirect XXH_memcpy(), XXH_memset() and XXH_memcmp(). A new XXH_NO_EXTERNC_GUARD macro is also available for projects that need to manage C++ linkage themselves.

Correctness and portability

A strict-aliasing issue that could cause gcc to miscompile some unaligned reads has been fixed. This release also addresses combinations involving XXH_INLINE_ALL, namespaces and x86 runtime dispatch, system headers included from an extern "C" block, and MSVC link-time optimization with warnings enabled as errors.

Portability improvements include compatibility with ARM builds using GCC versions older than 8, C++ compilation on Solaris and illumos, and improved installation metadata and paths on Windows and FreeBSD.

Detailed changelist

perf : added RISC-V Vector extension (RVV) implementation, by @zijianli1234, @BoBoDai and @camel-cdr
perf : added LoongArch LASX implementation and improved LSX, by @24bit-xjkp
perf : prefer NEON over SVE on AArch64, improving XXH3 speed by 25–40%, by @Nicoshev
perf : improved XXH3 streaming speed for very small updates, suggested by @aleksazr
api : XXH_memcpy(), XXH_memset() and XXH_memcmp() can be redirected at compile time
api : new XXH_NO_EXTERNC_GUARD build macro for complex C++ integration
cli : added 64-bit seed support (-s, --seed), by @d06i
cli : options can appear after filenames; -- terminates option parsing, [#1098] reported by @unterkomplex
cli : continue processing subsequent files after read errors, [#1064] reported by @ZoomRmc
cli : support long and special Windows paths, [#1060], based on [#1061] by @t-mat
cli : improved benchmark accuracy, error handling and unit labels, [#1051] reported by @calgray
fix : unaligned reads could be miscompiled by GCC under strict aliasing, [#1013] by @lassipulkkinen
fix : XXH_INLINE_ALL compatibility with XXH_NAMESPACE and x86 runtime dispatch, by @pps83, [#1071] reported by @Dr-Hex
fix : avoid including system headers inside an extern "C" block, [#1122] reported by @andreas-schwab
fix : compilation with MSVC link-time optimization and warnings as errors, [#1038] reported by @mi2think
build: improved runtime dispatch detection for cross-compilation and non-x86 targets, with help from @eworm-de, [#1081] reported by @PotMJ
build: LIBXXH_DISPATCH=1 now applies to static and dynamic libraries, [#1058] reported by @xiota
build: Make builds now isolate objects by configuration and support parallel test builds
build: moved CMake integration to build/cmake and improved cross-compilation detection
install: improved package metadata and installation paths on Windows and FreeBSD, by @iwamatsu, @chitao1234 and @sunpoet
portability: fixed compilation on ARM with GCC < 8, by @mstorsjo
portability: fixed C++ compilation on Solaris and illumos, by @luqmana
doc : expanded xxhsum documentation and clarified the algorithm specification files
doc : documented non-cryptographic collision properties, notably for XXH3's mid-size path, [#1127] by @thomasahle