Matthias Springer d18ffd61d4 [mlir][SCF] Canonicalize dim(x) where x is an iter_arg ...

* Add `DimOfIterArgFolder`.
* Move existing cross-dialect canonicalization patterns to `LoopCanonicalization.cpp`.
* Rename `SCFAffineOpCanonicalization` pass to `SCFForLoopCanonicalization`.
* Expand documentaton of scf.for: The type of loop-carried variables may not change with iterations. (Not even the dynamic type.)

Differential Revision: https://reviews.llvm.org/D108806

2021-08-30 01:39:56 +00:00

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