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Add NEWS for 5.3.4alpha.
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NEWS
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NEWS
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XZ Utils Release Notes
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XZ Utils Release Notes
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======================
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======================
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5.3.4alpha (2022-11-15)
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* All fixes from 5.2.7 and 5.2.8.
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* liblzma:
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- Minor improvements to the threaded decoder.
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- Added CRC64 implementation that uses SSSE3, SSE4.1, and CLMUL
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instructions on 32/64-bit x86 and E2K. On 32-bit x86 it's
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not enabled unless --disable-assembler is used but then
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the non-CLMUL code might be slower. Processor support is
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detected at runtime so this is built by default on x86-64
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and E2K. On these platforms, if compiler flags indicate
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unconditional CLMUL support (-msse4.1 -mpclmul) then the
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generic version is not built, making liblzma 8-9 KiB smaller
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compared to having both versions included.
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With extremely compressible files this can make decompression
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up to twice as fast but with typical files 5 % improvement
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is a more realistic expectation.
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The CLMUL version is slower than the generic version with
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tiny inputs (especially at 1-8 bytes per call, but up to
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16 bytes). In normal use in xz this doesn't matter at all.
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- Added an experimental ARM64 filter. This is *not* the final
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version! Files created with this experimental version won't
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be supported in the future versions! The filter design is
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a compromise where improving one use case makes some other
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cases worse.
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- Added decompression support for the .lz (lzip) file format
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version 0 and the original unextended version 1. See the
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API docs of lzma_lzip_decoder() for details. Also
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lzma_auto_decoder() supports .lz files.
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- Building with --disable-threads --enable-small
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is now thread-safe if the compiler supports
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__attribute__((__constructor__))
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* xz:
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- Added support for OpenBSD's pledge(2) as a sandboxing method.
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- Don't mention endianness for ARM and ARM-Thumb filters in
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--long-help. The filters only work for little endian
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instruction encoding but modern ARM processors using
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big endian data access still use little endian
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instruction encoding. So the help text was misleading.
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In contrast, the PowerPC filter is only for big endian
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32/64-bit PowerPC code. Little endian PowerPC would need
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a separate filter.
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- Added --experimental-arm64. This will be renamed once the
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filter is finished. Files created with this experimental
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filter will not be supported in the future!
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- Added new fields to the output of xz --robot --info-memory.
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- Added decompression support for the .lz (lzip) file format
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version 0 and the original unextended version 1. It is
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autodetected by default. See also the option --format on
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the xz man page.
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* Scripts now support the .lz format using xz.
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* Build systems:
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- New #defines in config.h: HAVE_ENCODER_ARM64,
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HAVE_DECODER_ARM64, HAVE_LZIP_DECODER, HAVE_CPUID_H,
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HAVE_FUNC_ATTRIBUTE_CONSTRUCTOR, HAVE_USABLE_CLMUL
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- New configure options: --disable-clmul-crc,
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--disable-microlzma, --disable-lzip-decoder, and
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'pledge' is now an option in --enable-sandbox (but
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it's autodetected by default anyway).
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- INSTALL was updated to document the new configure options.
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- PACKAGERS now lists also --disable-microlzma and
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--disable-lzip-decoder as configure options that must
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not be used in builds for non-embedded use.
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* Tests:
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- Fix some of the tests so that they skip instead of fail if
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certain features have been disabled with configure options.
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It's still not perfect.
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- Other improvements to tests.
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* Updated translations: Croatian, Finnish, Hungarian, Polish,
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Romanian, Spanish, Swedish, and Ukrainian.
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5.3.3alpha (2022-08-22)
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5.3.3alpha (2022-08-22)
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* All fixes from 5.2.6.
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* All fixes from 5.2.6.
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