Sparse dsp opt

[lyang24]

issue: #1728

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[alexanderguzhva]

@lyang24 Hi, is this PR ready to be reviewed? Thanks

[lyang24]

@lyang24 Hi, is this PR ready to be reviewed? Thanks

yes should be good to review

[alexanderguzhva]

@lyang24 please rebase to master branch, because it moved to conan v2

[alexanderguzhva]

@sparknack Could you please help reviewing this as well? Thanks!

[lyang24]

please rebase to master branch, because it moved to conan v2

can i get sparse_dev_dev branch rebased to master by any chance

[chasingegg]

@lyang24 I've rebased sparse_dsp_dev to main, you could check

[alexanderguzhva]

@lyang24

2026-07-25T07:02:40.0946960Z /home/runner/work/knowhere/knowhere/src/index/sparse/sparse_index_node.cc:1179:25: error: implicit capture of 'this' with a capture default of '=' is deprecated [clang-diagnostic-deprecated-this-capture,-warnings-as-errors]
2026-07-25T07:02:40.0949212Z  1179 |                         index_->GetAllDistances(queries[i], drop_ratio_search, bitset, computer);
2026-07-25T07:02:40.0949773Z       |                         ^
2026-07-25T07:02:40.0950546Z /home/runner/work/knowhere/knowhere/src/index/sparse/sparse_index_node.cc:1176:43: note: add an explicit capture of 'this' to capture '*this' by reference
2026-07-25T07:02:40.0951740Z  1176 |                 auto compute_dist_func = [=]() -> std::vector<DistId> {
2026-07-25T07:02:40.0952118Z       |                                           ^
2026-07-25T07:02:40.0952405Z       |                                            , this
2026-07-25T07:02:40.0953199Z /home/runner/work/knowhere/knowhere/src/index/sparse/sparse_index_node.cc:1184:56: error: C-style casts are discouraged; use static_cast [modernize-avoid-c-style-cast,-warnings-as-errors]
2026-07-25T07:02:40.0954066Z  1184 |                             distances_ids.emplace_back((int64_t)i, distances[i]);
2026-07-25T07:02:40.0954468Z       |                                                        ^~~~~~~~~ 
2026-07-25T07:02:40.0954820Z       |                                                        static_cast<int64_t>( )
2026-07-25T07:02:40.0955287Z 
2026-07-25T07:02:40.0960641Z [34/56][5.2s] clang-tidy-22 -p=./build/Release -quiet /home/runner/work/knowhere/knowhere/src/simd/sparse_simd_avx512.cc
2026-07-25T07:02:40.0961631Z /home/runner/work/knowhere/knowhere/src/simd/sparse_simd_avx512.cc:49:63: error: C-style casts are discouraged; use static_cast [modernize-avoid-c-style-cast,-warnings-as-errors]
2026-07-25T07:02:40.0962499Z    49 |                 uint32_t hi = std::min<uint64_t>(full_chunks, uint64_t(base) + step + 1);
2026-07-25T07:02:40.0962923Z       |                                                               ^~~~~~~~
2026-07-25T07:02:40.0963281Z       |                                                               static_cast<uint64_t>
2026-07-25T07:02:40.0963524Z 

[alexanderguzhva]

superseded by #1763