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Add cooperative-matrix capability and reflection contracts

Aperta
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#38 0 commenti 0 reazioni 0 assegnatari Vedi su GitHub

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Valutazione

Difficoltà
5/5
Tempo stimato
Più di una settimana
Idoneità per principianti
35/100
Tipo di issue
Funzionalità
Chiarezza
Abbastanza chiara
Stato di attività
Tranquilla
Stack tecnologico
cpp
Ambito
backend-api-design, compilers, testing-qa

Direzione di ricerca

Start by locating the reflection/package metadata, target-explanation output, package verifier, target profiles, and runtime capability declarations. Trace how requirements are encoded and validated, then design the cooperative-matrix contract around the listed fields and provenance. Done includes forward-compatible JSON encoding plus schema round-trip, verifier, and target-explanation tests covering unsupported capabilities and inconsistent declarations.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Problem

Portable shader packages need to distinguish ordinary per-invocation matrices from cooperative matrices whose storage and operations are distributed across a subgroup or wave. The compiler reflection and target-explanation contracts do not currently expose enough information for a runtime or package verifier to decide whether a translated cooperative-matrix artifact is executable on a device.

This is required independently of any one source language. Examples include Metal simdgroup_matrix, SPIR-V OpTypeCooperativeMatrixKHR, HLSL vk::CooperativeMatrix, emerging dx::linalg::Matrix facilities, and Slang cooperative matrix abstractions.

Requested contract

  • Add a stable cooperative-matrix requirement record to reflection/package metadata.
  • Represent component type, rows, columns, execution scope, operand/use role, memory layout, subgroup-size constraints, and required target extensions or shader model.
  • Distinguish native lowering from an explicit software fallback and record any workgroup-size/shared-memory requirements introduced by that fallback.
  • Include cooperative-matrix requirements in target explanation output with actionable unsupported-capability reasons.
  • Make package verification reject artifacts whose declared requirements are inconsistent with their target profile or missing from runtime capability declarations.
  • Preserve source provenance for each requirement so diagnostics can identify the originating type or operation.
  • Document forward-compatible JSON encoding and add schema round-trip, verifier, and target-explanation tests.

Interoperability

CrossTL can mirror this development contract while remaining independently usable, then emit compatible metadata when the compiler package API stabilizes. The translator must not require a published compiler release to lower source code.

Real-world driver

MLX Winograd, attention, and GEMM Metal kernels use subgroup-distributed matrix fragments. Translating the syntax is insufficient: runtime selection must know whether the target device supports the required shape/scope and whether a generated fallback has additional launch constraints. The requested contract should be general enough for other Metal, Vulkan, DirectX, and Slang repositories.

Lingua principale
C++
Stelle
0
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