thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-21 15:12:02 +00:00
Code Issues Packages Projects Releases Wiki Activity

Fix performance (probably)

Browse Source
This commit is contained in:
Nikita Mikhaylov 2021-08-25 00:04:29 +00:00
parent de8aa64e56
commit c5ca63c606
1 changed files with 9 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/Compression/LZ4_decompress_faster.cpp
View File

@ -475,7 +475,15 @@ bool NO_INLINE decompressImpl(
return false;
// Due to implementation specifics the copy length is always a multiple of copy_amount
const size_t real_length = std::max(copy_amount, static_cast<size_t>(std::ceil(static_cast<double>(length) / copy_amount) * copy_amount));
size_t real_length = 0;
if constexpr (copy_amount == 8)
real_length = (((length >> 3) + 1) * 8);
else if constexpr (copy_amount == 16)
real_length = (((length >> 4) + 1) * 16);
else if constexpr (copy_amount == 32)
real_length = (((length >> 5) + 1) * 32);
else
throw std::runtime_error("Compile error!");
if (unlikely(ip + real_length >= input_end + ADDITIONAL_BYTES_AT_END_OF_BUFFER))
return false;