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