forked from OSchip/llvm-project
02da964350
This patch enhances the CSE pass to deal with simple cases of duplicated operations with MemoryEffects. It allows the CSE pass to remove safely duplicate operations with the MemoryEffects::Read that have no other side-effecting operations in between. Other MemoryEffects::Read operation are allowed. The use case is pretty simple so far so we can build on top of it to add more features. This patch is also meant to avoid a dedicated CSE pass in FIR and was brought together afetr discussion on https://reviews.llvm.org/D112711. It does not currently cover the full range of use cases described in https://reviews.llvm.org/D112711 but the idea is to gradually enhance the MLIR CSE pass to handle common use cases that can be used by other dialects. This patch takes advantage of the new CSE capabilities in Fir. Reviewed By: mehdi_amini, rriddle, schweitz Differential Revision: https://reviews.llvm.org/D122801 |
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