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AK: Rewrite the hint-based CircularBuffer::find_copy_in_seekback

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This now searches the memory in blocks, which should be slightly more
efficient. However, it doesn't make much difference (e.g. ~1% in LZMA
compression) in most real-world applications, as the non-hint function
is more expensive by orders of magnitude.
This commit is contained in:
Tim Schumacher 2023-06-02 01:25:56 +02:00 • committed by Linus Groh
parent 3526d67694
commit 42d01b21d8
4 changed files with 36 additions and 51 deletions
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6
Userland/Libraries/LibCompress/Lzma.cpp
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@ -998,10 +998,10 @@ ErrorOr<void> LzmaCompressor::encode_once()
m_rep2 + normalized_to_real_match_distance_offset,
m_rep3 + normalized_to_real_match_distance_offset,
};
auto existing_distance_results = TRY(m_dictionary->find_copy_in_seekback(existing_distances, m_dictionary->used_space(), normalized_to_real_match_length_offset));
auto existing_distance_result = m_dictionary->find_copy_in_seekback(existing_distances, m_dictionary->used_space(), normalized_to_real_match_length_offset);
if (existing_distance_results.size() > 0) {
auto selected_match = existing_distance_results[0];
if (existing_distance_result.has_value()) {
auto selected_match = existing_distance_result.release_value();
TRY(encode_existing_match(selected_match.distance, selected_match.length));
return {};
}