[Mlir-commits] [mlir] [mlir][Interfaces] Add `mustProgress` interface method + folding pattern (PR #179039)

[Matthias Springer]

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@@ -351,6 +351,18 @@ def RegionBranchOpInterface : OpInterface<"RegionBranchOpInterface"> {
       (ins "::mlir::Type":$lhs, "::mlir::Type":$rhs), [{}],
       /*defaultImplementation=*/[{ return lhs == rhs; }]
     >,
+    InterfaceMethod<[{
+        Region branch ops that "must progress" are required to terminate (i.e.,
+        not loop infinitely between their regions) or interact with the
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matthias-springer wrote:

Imo, that would be consistent with `mustprogress`. When you terminate the program, the loop also terminates.

What's a bit weird is that `exit` can be a kind of "early exit" from loops, which MLIR does not support today. But that's independent of `mustprogress`.


https://github.com/llvm/llvm-project/pull/179039