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mlir

Use when defining an MLIR dialect with ODS, writing a lowering with ConversionPattern, running mlir-opt pipelines down to the LLVM dialect, or importing models via Torch-MLIR or IREE.

.devin/skills/mlir/SKILL.md

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# MLIR

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A user builds a domain-specific compiler IR, lowers high-level ops toward LLVM or GPU dialects, writes a progressive lowering pipeline, defines ops in TableGen, or connects a PyTorch or ONNX model to an MLIR-based compiler. |
| Authority | Reversible local: writes only the dialect, pass, and test files the user names inside the project, plus generated `.inc` files and scratch `.mlir` outputs in the build directory; rollback is version control and deleting the build directory. No remote mutation. |
| Side effect | `mlir-tblgen` generates op code, the dialect and passes are built, and `mlir-opt` runs the pipeline on test IR with the verifier on. |
| Done | Test IR parses, the pipeline leaves no illegal op, the output translates to LLVM IR when the target is the LLVM dialect, and every custom op round-trips through its assembly format. |

## Inputs

1. The IR level to work at (required): existing dialects only, or a custom dialect with named ops.