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[Linalg] Validation of MatVecMul incorrectly reports wrong vector length #8936

Closed
Bug
#8951
Closed
[Linalg] Validation of MatVecMul incorrectly reports wrong vector length#8936
Bug
#8951
Assignees
V-FEXrt
Labels
bugBug, regression, crashneeds-triageAwaiting triage

Description

@llvm-beanz
Chris B (llvm-beanz)
opened on Sep 21, 2026

Description
When constructing a MatVecMul with an FP8 matrix, and FP16 vector inputs and outputs, the validator incorrectly identifies the vector length as invalid. It seems to be assuming that the vector length must be packed disregarding the input interpretation type.

Steps to Reproduce
https://hlsl.godbolt.org/z/zM9zh3ah1

Environment

  • DXC version: main
  • Host Operating System: all

Activity

  1. Chris B (llvm-beanz)
    added
    bugBug, regression, crash
    needs-triageAwaiting triage
    on Sep 21, 2026
  2. github-project-automation
    added this to HLSL Triageon Sep 21, 2026
  3. Damyan Pepper (damyanp)
    assigned
    Ashley Coleman (V-FEXrt)
    on Sep 21, 2026
  4. Damyan Pepper (damyanp)
    added a parent issue on Sep 21, 2026
  5. github-project-automation
    added this to HLSL Supporton Sep 21, 2026
  6. Damyan Pepper (damyanp)
    moved this to Planning in HLSL Supporton Sep 22, 2026
  7. Damyan Pepper (damyanp)
    moved this from Planning to Active in HLSL Supporton Sep 22, 2026
  8. Damyan Pepper (damyanp)
    added the
    Bug
    issue type on Sep 23, 2026
  9. Ashley Coleman (V-FEXrt)
    closed this as completedin #8951on Sep 23, 2026
  10. Ashley Coleman (V-FEXrt)
    added a commit that references this issue on Sep 23, 2026

    [SM6.10] LinAlg: Fix header bug in interp type (#8951)

    87072d9
  11. github-project-automation
    moved this to Triaged in HLSL Triageon Sep 23, 2026
  12. github-project-automation
    moved this from Active to Closed in HLSL Supporton Sep 23, 2026
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