llvm-project

ccbf6ad5 - [mlir][acc] Add utilities for converting acc.loop to scf (#172953)

[mlir][acc] Add utilities for converting acc.loop to scf (#172953) Add OpenACCUtilsLoop.h/.cpp with utilities for converting acc.loop operations to SCF dialect operations: - convertACCLoopToSCFFor: Convert structured acc.loop to scf.for with loop collapsing support - convertACCLoopToSCFParallel: Convert acc.loop to scf.parallel - convertUnstructuredACCLoopToSCFExecuteRegion: Convert unstructured acc.loop (multi-block) to scf.execute_region Key features: - Automatic type conversion between integer types and index - Inclusive-to-exclusive upper bound conversion - Trip count calculation with clamping for negative counts - Constant folding via createOrFold for cleaner IR - Assertions to prevent misuse (e.g., builder inside loop region) - Error emission for unsupported cases (loops with results) Comprehensive unit tests covering these APIs are also added. --------- Co-authored-by: Scott Manley <rscottmanley@nvidia.com>