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Author SHA1 Message Date
Matthias Springer c7d569b8f7 [mlir][scf] Fold dim(scf.for) to dim(iter_arg) 
Fold dim ops of scf.for results to dim ops of the respective iter args if the loop is shape preserving.

Differential Revision: https://reviews.llvm.org/D109430
 2021-09-09 13:47:13 +09:00
Matthias Springer 4fa6c2734c [mlir][scf] Allow runtime type of iter_args to change 
The limitation on iter_args introduced with D108806 is too restricting. Changes of the runtime type should be allowed.

Extends the dim op canonicalization with a simple analysis to determine when it is safe to canonicalize.

Differential Revision: https://reviews.llvm.org/D109125
 2021-09-03 10:03:05 +09:00
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