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NVIDIA / cccl Public

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Integrate `Reduce::ByKey` to prefetching#9698

Closed

gonidelis wants to merge 27 commits into

NVIDIA:mainNVIDIA/cccl:mainfrom

gonidelis:prefetch_reducebykeygonidelis/cccl:prefetch_reducebykeyCopy head branch name to clipboard

Conversation Commits27 (27)Checks Files changed

Closed

Integrate `Reduce::ByKey` to prefetching#9698
gonidelis wants to merge 27 commits into
NVIDIA:mainfrom
gonidelis:prefetch_reducebykey

Commits

Commits on Jul 1, 2026

Add cuda::ptx::prefetch::l1/l2 wrappers for prefetching in libcudacxx
gonidelis
committed
Add BLOCK_LOAD_DIRECT_PREFETCH implementation
gonidelis
committed
integrate reduce_by_key to use load prefetch
gonidelis
committed
hack all workloads to use prefetch
gonidelis
committed
Make BlockLoadPrefetch a compile-time parameter to BlockLoad
gonidelis
committed
enable prefetching in reduce_by_key benchmark
gonidelis
committed
Fix ::cub:: qualified prefetch call in wrapped-namespace builds
gonidelis
committed
expose stride as a parameter for prefetching
gonidelis
committed
Move load_prefetch after load_modifier in ReduceByKeyPolicy and other minor reviews
gonidelis
committed
move blockloadprefetch in detail namespace
gonidelis
committed
revert load_prefetch field ordering in ReduceByKeyPolicy to not break positional initializers
gonidelis
committed
fix RleEncodePolicy adapter: drop missing load_prefetch field
gonidelis
committed
remove libcudacxx ptx prefetch wrappers
gonidelis
committed
- remove cacheloadmodified iterator handling and document it in note
gonidelis
committed
reviews and ci fix
gonidelis
committed
Introduce TMA prefetch path for sm90+
gonidelis
committed
move prefetch enum place so no forward declaration is needed
gonidelis
committed
encode reducebykey prefetch (non-tma) tunings run
gonidelis
committed
port reducebykey prefetch tunings to the live policy_selector (new tuning API)
gonidelis
committed
use block_elect_one instead of tid=0
gonidelis
committed
properly align base and size to 16bytes per ISA instructions
gonidelis
committed

Commits on Jul 2, 2026

enable prefetch for all BlockLoad algorithms
gonidelis
committed
strip reducebyekey integration
gonidelis
committed
Restore catch2_test_device_reduce_env.cu to merge-base
gonidelis
committed
add tests
gonidelis
committed

Commits on Jul 3, 2026

Reintroduce reduce_by_key prefetch integration on top of generalized design
gonidelis
committed
strip tunings from old tuning policy API
gonidelis
committed

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