Add repeat support for compute tiles

[AndraBisca]

Currently, a repeat value can be specified for Mem tiles via the objectfifo's memtile_repeat attribute. This PR extends it to compute tiles as well.

Specifically:

• the objectfifo attribute name is changed from memtile_repeat to repeat_count,
• this PR also changes the value that repeat_count represents for objectfifos: a repeat of 'n' means 'n' total copies of that data will be transferred including the first one,
• this PR ensures that if the repeat_count attribute of the objectfifo is set, the objectfifo lowering will always use DMAs,
• currently the objectfifo attribute is lowered to the repeat_count attribute of DMAStartOps for Mem tiles: this is added for compute tiles,
• currently a repeat value can also be specified using data layout transformation dimensions in the objectfifo for Mem tiles: this is removed as the repeat dimension is not actually exposed in mlir-aie and this features (wrongly) assumed the highest dimension was the repeat dimension.

TODO: add documentation to programming guide

[github-actions]

Coverage Report

Created: 2024-10-21 18:37

Click here for information about interpreting this report.

Filename	Function Coverage	Line Coverage	Region Coverage	Branch Coverage
IR/AIEDialect.cpp	89.63%	82.21%	84.72%	74.71%
Transforms/AIEObjectFifoStatefulTransform.cpp	100.00%	93.92%	91.76%	85.66%
Totals	92.05%	87.78%	87.24%	79.01%

Generated by llvm-cov -- llvm version 14.0.0