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[mlir][docs] Add docs on canonicalizers being folders or patterns #129517

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5 changes: 5 additions & 0 deletions mlir/docs/Canonicalization.md
Original file line number Diff line number Diff line change
Expand Up @@ -275,3 +275,8 @@ Operation *MyDialect::materializeConstant(OpBuilder &builder, Attribute value,
...
}
```

### When to use the `fold` method vs `RewriterPattern`s for canonicalizations

A canonicalization should always be implemented as a `fold` method if it can
be, otherwise it should be implemented as a `RewritePattern`.