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authorJia Tan <jiat0218@gmail.com>2024-02-12 17:09:10 +0200
committerLasse Collin <lasse.collin@tukaani.org>2024-02-14 18:31:16 +0200
commitde5c5e417645ad8906ef914bc059d08c1462fc29 (patch)
tree62672e60baf3f24030c402f5b3364671a2b81dee /src/xz/xz.1
parentliblzma: Creates separate "safe" range decoder mode. (diff)
downloadxz-de5c5e417645ad8906ef914bc059d08c1462fc29.tar.xz
liblzma: Creates Non-resumable and Resumable modes for lzma_decoder.
The new decoder resumes the first decoder loop in the Resumable mode. Then, the code executes in Non-resumable mode until it detects that it cannot guarantee to have enough input/output to decode another symbol. The Resumable mode is how the decoder has always worked. Before decoding every input bit, it checks if there is enough space and will save its location to be resumed later. When the decoder has more input/output, it jumps back to the correct sequence in the Resumable mode code. When the input/output buffers are large, the Resumable mode is much slower than the Non-resumable because it has more branches and is harder for the compiler to optimize since it is in a large switch block. Early benchmarking shows significant time improvement (8-10% on gcc and clang x86) by using the Non-resumable code as much as possible.
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