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@@ -2,6 +2,102 @@ XZ Utils Release Notes ====================== +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. + + 5.3.3alpha (2022-08-22) * All fixes from 5.2.6. |