[JakeStevens]

Summary:

Ulterior Motive

Unblock matrix multiplication in native Swin and Swin V2 execution.

Rationale

What: Lower supported static FP32 matmul operations to existing mm and bmm kernels.

Why: The CPU execution plan has kernels for those operations but cannot select a kernel for the generic matmul nodes in these graphs.

Details

• Rewrite rank-two matrices and matched rank-three batches directly to mm or bmm.
• For higher-rank or broadcasted batches, copy the expanded operands, flatten batch dimensions, run bmm, and restore the original output shape and value ID.
• Validate operand types, contraction, broadcasting and output metadata; reject vector and empty-matrix cases explicitly.
• Allocate the executable's buffer slots after lowering has added intermediate values.
• Leave alias functionalization and its view-to-copy mappings unchanged.

Authored with AI using Metamate on agentcloud.

Differential Revision: D129095332

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/24454

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❌ 2 New Failures, 2 Unclassified Failures

As of commit 975a85b with merge base 822cb60 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner (gh)
  >>> Lint for backends/native/runtime/cpu/CPUEngineExecutable.cpp:
• pull / nxp-mcuxpresso-test / linux-job (gh)
  RuntimeError: Command bash /__w/_temp/exec_script failed with exit code 1

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• Build Aarch64 Linux Native Wheels / executorch-native / build-wheel-py3_11-cpu-aarch64 (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  ModuleNotFoundError: No module named 'setuptools'
• Build Aarch64 Linux Native Wheels / executorch-native / upload / upload-wheel-py3_11-cpu-aarch64 (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found

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[meta-codesync]

@JakeStevens has exported this pull request. If you are a Meta employee, you can view the originating Diff in D129095332.

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