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Add Rust cooperative Histogram - #12240

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tpn:codex/cuda-coop-rust-histogram
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tpn wants to merge 9 commits into
NVIDIA:mainfrom
tpn:codex/cuda-coop-rust-histogram

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@tpn tpn commented Oct 24, 2026 •

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Add Block Histogram with checked bins and fresh counts. Typed inputs, algorithm selection and explicit temporary storage follow the common Rust cooperative API.

Builds on #12132. The owning comparison isolates this review unit; the GitHub diff against main is cumulative.

Validation on the reconstructed layer: formatting, host tests, clippy and docs, plus standalone public examples on CUDA 13.3 / sm_120. The full native provider suite passes separately at the final integrated stack. Historical broader diagnostics, sanitizer and profile evidence retains its original source attribution.

This PR remains draft.

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@cccl-authenticator-app cccl-authenticator-app Bot moved this from Todo to In Progress in CCCL Oct 24, 2026
tpn added 9 commits October 24, 2026 17:38
Provide the Rust payload, group and scratch contracts, native CUB
provider and Oxide integration with complete Block and Warp I/O.

Signed-off-by: Trent Nelson <trent@trent.me>
Expose Block and Warp scans with explicit payload validity,
prefix registration and native provider integration.

Signed-off-by: Trent Nelson <trent@trent.me>
Avoid copying inactive batch output lanes while preserving active
results and add focused coverage for narrow output batches.

Signed-off-by: Trent Nelson <trent@trent.me>
Provide scalar and payload reductions with validity-aware results.
Include checked stateless and uniform i32 capture callbacks at their
first public consumer, together with the native callback ABI.

Signed-off-by: Trent Nelson <trent@trent.me>
Signed-off-by: Trent Nelson <trent@trent.me>
Preserve the batch dimension and per-batch output validity while using
the CUB output-copy guard. Include the provider shape correction.

Signed-off-by: Trent Nelson <trent@trent.me>
Expose complete Block and Warp exchange operations and Block shifts
with explicit layout, output validity and scratch completion.

Signed-off-by: Trent Nelson <trent@trent.me>
Provide neighboring-item transforms and head/tail flags with typed
neighbor controls, payload validity and explicit scratch completion.

Signed-off-by: Trent Nelson <trent@trent.me>
Expose Block histogram algorithms with typed bin controls and fresh
output ownership through the shared native provider.

Signed-off-by: Trent Nelson <trent@trent.me>
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tpn force-pushed the codex/cuda-coop-rust-histogram branch from 48ee91e to 290ec8b Compare October 25, 2026 01:33
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@tpn tpn changed the title [Rust] Add Block Histogram Add Rust cooperative Histogram Oct 25, 2026

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