Evidence-backed readiness

The following view is generated from the existing capability matrix, profiling matrix, and benchmark registry. Implementation, retained evidence, and exact performance records remain separate. Query or regenerate it with:

python scripts/backend_status.py check
python scripts/backend_status.py summary
python scripts/backend_status.py json --backend vulkan
python scripts/backend_status.py render

A profiling cell may be marked ready only after its retained_evidence list links structured run-evidence JSON using repository-relative path and sha256 fields. The run artifact must contain:

• integer schema_version: 1 and protocol quantem-gpu-cell-evidence/v1;

• cell_id, backend, and runner matching the profiling cell exactly;

• status: passed and the full 40-character source_revision;

• a fixture object with an immutable id and 64-character sha256;

• a result object naming retained output by repository-relative path and sha256; the output must exist and its digest must match; and

• outcomes mapping each required gate name to passed. Required gates are the cell’s pr_gate plus every outcome in the profiling matrix’s required_evidence.required_outcomes, currently scientific-parity and real-data-e2e.

The profile matrix owns that evidence policy; this artifact is a retained run, not another registry. Existing generic experiment manifests remain retained, but completed alone cannot be promoted: some completed runs contain failed scientific gates. They need a reviewed cell-specific run record before use in signoff. A correctly hashed test source file is rejected as run evidence.

Human scientific adjudication is still required: a structurally valid record does not prove its measurements are truthful or cover the entire cell scope. Review its fixture, output, exact revision, runner, and gate outcomes against the scientific contract. Failed and historical experiments remain retained in the experiment and benchmark ledgers; do not relabel them as passed signoff evidence. Compilation or a test’s mere existence never substitutes for a run.

When this check was introduced, 31 legacy ready declarations had no cell-scoped immutable signoff evidence linked. They were corrected to evidence-gap, with an explanation in each profiling cell. This is an evidence-accounting correction, not a backend regression: existing test gates, implementation levels, frozen results, and historical benchmark measurements were preserved. Broader package signoff requires the full cell scope; a retained result for one shape, dtype, or device does not establish it.

Historical timings and exact comparison conditions remain in the benchmark ledger. See the profiling protocol for required runners and the scientific parity contract for numerical acceptance.

Backend readiness

Generated from the capability matrix, profiling matrix, and benchmark registry. Package-engineering signoff is not consumer-application or distribution approval. Ready means required evidence is retained; it does not mean every workload is qualified. Performance records remain separate, with exact workload and comparison conditions. Use python scripts/backend_status.py json --backend BACKEND for all records.

Backend	Package signoff	Performance records
cpu-reference	blocked	recorded
cuda	blocked	recorded
mps	blocked	recorded
swift-metal	blocked	recorded
webgpu	blocked	recorded
vulkan	not-scheduled	not-recorded

cpu-reference

Capability	Implementation	Evidence	Signoff
io.packed-display-precision	not-implemented	unsupported	not-scheduled
io.empad-float-resident	implemented	evidence-gap	not-scheduled
geometry.scan-quarter-turn	implemented	evidence-gap	blocked
io.decode-bin-provenance	implemented	evidence-gap	blocked
io.selective-scan-loading	not-implemented	unsupported	not-scheduled
detector.integer-products	implemented	evidence-gap	blocked
screening.prepared-products	implemented	evidence-gap	blocked
dpc.com-rotation-idpc	implemented	evidence-gap	blocked
display.transform-histogram-color-fft	implemented	evidence-gap	blocked
ssb.object-phase-loss	implemented	evidence-gap	blocked
ssb.calibration-200-nelder-mead	implemented	evidence-gap	blocked

Blocking signoff cells:

• geometry.scan-quarter-turn::cpu-reference

• io.decode-bin-provenance::cpu-reference

• detector.integer-products::cpu-reference

• screening.prepared-products::cpu-reference

• dpc.com-rotation-idpc::cpu-reference

• display.transform-histogram-color-fft::cpu-reference

• ssb.object-phase-loss::cpu-reference

• ssb.calibration-200-nelder-mead::cpu-reference

cuda

Capability	Implementation	Evidence	Signoff
io.packed-display-precision	implemented	evidence-gap	not-scheduled
io.empad-float-resident	partial	evidence-gap	not-scheduled
geometry.scan-quarter-turn	implemented	evidence-gap	blocked
io.decode-bin-provenance	implemented	evidence-gap	blocked
io.selective-scan-loading	implemented	evidence-gap	blocked
detector.integer-products	implemented	evidence-gap	blocked
screening.prepared-products	implemented	evidence-gap	blocked
dpc.com-rotation-idpc	implemented	evidence-gap	blocked
display.transform-histogram-color-fft	not-implemented	unsupported	not-scheduled
ssb.object-phase-loss	implemented	evidence-gap	blocked
ssb.calibration-200-nelder-mead	implemented	evidence-gap	blocked

Blocking signoff cells:

• geometry.scan-quarter-turn::cuda

• io.decode-bin-provenance::cuda

• io.selective-scan-loading::cuda

• detector.integer-products::cuda

• screening.prepared-products::cuda

• dpc.com-rotation-idpc::cuda

• ssb.object-phase-loss::cuda

• ssb.calibration-200-nelder-mead::cuda

mps

Capability	Implementation	Evidence	Signoff
io.packed-display-precision	implemented	evidence-gap	not-scheduled
io.empad-float-resident	partial	evidence-gap	not-scheduled
geometry.scan-quarter-turn	implemented	evidence-gap	blocked
io.decode-bin-provenance	implemented	evidence-gap	blocked
io.selective-scan-loading	implemented	evidence-gap	blocked
detector.integer-products	implemented	evidence-gap	blocked
screening.prepared-products	implemented	evidence-gap	blocked
dpc.com-rotation-idpc	implemented	evidence-gap	blocked
display.transform-histogram-color-fft	implemented	evidence-gap	blocked
ssb.object-phase-loss	implemented	evidence-gap	blocked
ssb.calibration-200-nelder-mead	implemented	evidence-gap	blocked

Blocking signoff cells:

• geometry.scan-quarter-turn::mps

• io.decode-bin-provenance::mps

• io.selective-scan-loading::mps

• detector.integer-products::mps

• screening.prepared-products::mps

• dpc.com-rotation-idpc::mps

• display.transform-histogram-color-fft::mps

• ssb.object-phase-loss::mps

• ssb.calibration-200-nelder-mead::mps

swift-metal

Capability	Implementation	Evidence	Signoff
io.packed-display-precision	partial	evidence-gap	not-scheduled
io.empad-float-resident	partial	evidence-gap	blocked
geometry.scan-quarter-turn	implemented	evidence-gap	blocked
io.decode-bin-provenance	implemented	evidence-gap	blocked
io.selective-scan-loading	not-implemented	unsupported	not-scheduled
detector.integer-products	implemented	evidence-gap	blocked
screening.prepared-products	not-implemented	unsupported	not-scheduled
dpc.com-rotation-idpc	implemented	evidence-gap	blocked
display.transform-histogram-color-fft	implemented	evidence-gap	blocked
ssb.object-phase-loss	implemented	evidence-gap	blocked
ssb.calibration-200-nelder-mead	implemented	evidence-gap	blocked

Blocking signoff cells:

• io.empad-float-resident::swift-metal

• geometry.scan-quarter-turn::swift-metal

• io.decode-bin-provenance::swift-metal

• detector.integer-products::swift-metal

• dpc.com-rotation-idpc::swift-metal

• display.transform-histogram-color-fft::swift-metal

• ssb.object-phase-loss::swift-metal

• ssb.calibration-200-nelder-mead::swift-metal

webgpu

Capability	Implementation	Evidence	Signoff
io.packed-display-precision	not-implemented	unsupported	not-scheduled
io.empad-float-resident	not-implemented	unsupported	not-scheduled
geometry.scan-quarter-turn	implemented	evidence-gap	blocked
io.decode-bin-provenance	implemented	evidence-gap	blocked
io.selective-scan-loading	partial	evidence-gap	blocked
detector.integer-products	implemented	evidence-gap	blocked
screening.prepared-products	not-implemented	unsupported	not-scheduled
dpc.com-rotation-idpc	implemented	evidence-gap	blocked
display.transform-histogram-color-fft	implemented	evidence-gap	blocked
ssb.object-phase-loss	partial	evidence-gap	blocked
ssb.calibration-200-nelder-mead	not-implemented	unsupported	not-scheduled

Blocking signoff cells:

• geometry.scan-quarter-turn::webgpu

• io.decode-bin-provenance::webgpu

• io.selective-scan-loading::webgpu

• detector.integer-products::webgpu

• dpc.com-rotation-idpc::webgpu

• display.transform-histogram-color-fft::webgpu

• ssb.object-phase-loss::webgpu

vulkan

Capability	Implementation	Evidence	Signoff
io.packed-display-precision	not-implemented	unsupported	not-scheduled
io.empad-float-resident	not-implemented	unsupported	not-scheduled
geometry.scan-quarter-turn	not-implemented	unsupported	not-scheduled
io.decode-bin-provenance	partial	evidence-gap	not-scheduled
io.selective-scan-loading	not-implemented	unsupported	not-scheduled
detector.integer-products	partial	evidence-gap	not-scheduled
screening.prepared-products	partial	evidence-gap	not-scheduled
dpc.com-rotation-idpc	partial	evidence-gap	not-scheduled
display.transform-histogram-color-fft	partial	evidence-gap	not-scheduled
ssb.object-phase-loss	not-implemented	unsupported	not-scheduled
ssb.calibration-200-nelder-mead	not-implemented	unsupported	not-scheduled

Blocking signoff cells:

No release signoff is scheduled.