[kliegeois]

Problem

rocsparse-unit-test-device reports 14 failures on every wave64 gfx9 part (gfx90a / gfx94x / gfx950). They are not seen on gfx1201 (wave32), so they only show up on MI-series CI and local MI300X runs:

internal_collectives_wfreduce_sum.{i32,i64,f32,f64,complex_f32}
internal_collectives_wfreduce_max.{f32,f64,i32,i64}
internal_collectives_wfreduce_min.{i32,i64}
internal_collectives_wfreduce_partial_sum.{i32_sub8,f32_sub8}
internal_collective_extras_wfreduce_partial_sum.f64_sub8

Cause

The tests assert the reduction result in every lane. That is only what the shuffle-based implementations (ROCSPARSE_USE_MOVE_DPP == 0: gfx10+) guarantee. On gfx8/gfx9 the wfreduce_* routines are built from DPP row_shr / row_bcast steps, which accumulate the result only in the top lanes of the wavefront:

• wfreduce_sum / _max / _min: lane wf-1.
• wfreduce_partial_sum<WFSIZE, SUB> with SUB < 16: the last SUB lanes. The SUB == 16 and SUB == 32 cases use __shfl_xor throughout and already pass.

The routines are internal helpers whose results the library reads from those lanes, so this is a test expectation problem rather than a library bug.

Change

Test-only. rocsparse_ut::device_uses_dpp_wfreduce() selects gfx8/gfx9 from gcnArchName (the macro only exists in the device pass), and rocsparse_ut::wfreduce_first_valid_lane(wf, sub) returns the first lane to check: lane 0 on the shuffle path (every lane is still checked there), wf - sub on the DPP path. Both wfreduce unit-test files check lanes [first, wf). No library change.

Testing

rocsparse-unit-test-device, merged on top of develop aa96660108:

Device	Before	After
MI300X (gfx942, wave64)	632 pass, 14 fail	646 pass, 0 fail
gfx1201 (wave32)	not run	646 pass, 0 fail

[therock-pr-bot]

❌ PR Check — Action Required

Check	Status	Details
📝 PR Description	❌ Fail	Error: PR description must reference a JIRA ID, ISSUE ID, or a GitHub closing keyword. Expected: include a JIRA ID / ISSUE ID line (separator : or -, or omitted; value may be a JIRA key, a number with/without #, or a link), OR a closing keyword + issue reference. Accepted examples: • JIRA ID : TESTAUTO-6039 • JIRA ID - #330 • JIRA ID #330 • JIRA ID (on separate line) ROCM-25757 • ISSUE ID : TESTUTO-3334 • ISSUE ID #3334 • ISSUE ID - TESTAUTO-3433 • ISSUE ID (on separate line) AIRUNTIME-2352 • ISSUE ID : https://github.com/<org_name>/<repo_name>/issues/1234 • Closes #10 • Fixes octo-org/octo-repo#100 • Resolves: #123 • #123 • https://github.com/<org_name>/<repo_name>/issues/123 Current: no valid JIRA/ISSUE/closing-keyword reference found
⛔ Forbidden Files	✅ Pass	—
🧪 Unit Test	⚠️ Warning	Error: Source/code files changed without an accompanying unit test. Expected: add at least one test file named like test_<name>.py / test_<name>.cpp (or <name>_test.*). Current: code file(s) changed: projects/rocsparse/clients/unittests/unit_test_internal_collective_extras_wfreduce.cpp, projects/rocsparse/clients/unittests/unit_test_internal_collectives_warpreduce.cpp, projects/rocsparse/clients/unittests/unit_test_utils.hpp; no test file found
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[kliegeois]

Closing for #13389.