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UPSTREAM PR #18785: CUDA: Factor out and re-use two_stage_warp_reduce function#897

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UPSTREAM PR #18785: CUDA: Factor out and re-use two_stage_warp_reduce function#897
loci-dev wants to merge 2 commits into
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upstream-PR18785-branch_ORippler-osimons/factor_out_two_stage_warp_reductions

Use `two_stage_warp_reduce` also in softmax kernel, move smem out of it

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LOCI Review / Performance Review #897 succeeded Jan 12, 2026

Performance unchanged

0 binaries improved · 0 binaries unchanged · 0 binaries stable ~ within threshold · 0 binaries degraded ~ beyond threshold

Binary Δ % Response Δ % Throughput Performance (based on response time)

Performance threshold: 30%
Default configuration used.
Note: Performance status is evaluated only from Δ% Response. Throughput is displayed for reference.

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