Nicolas Vasilache 5bc344743c Uniformize the API for the mlir::tile functions on AffineForOp and loop::ForOp ... This CL adapts the recently introduced parametric tiling to have an API matching the tiling of AffineForOp. The transformation using stripmineSink is more general and produces imperfectly nested loops. Perfect nesting invariants of the tiled version are obtained by selectively applying hoisting of ops to isolate perfectly nested bands. Such hoisting may fail to produce a perfect loop nest in cases where ForOp transitively depend on enclosing induction variables. In such cases, the API provides a LogicalResult return but the SimpleParametricLoopTilingPass does not currently use this result. A new unit test is added with a triangular loop for which the perfect nesting property does not hold. For this example, the old behavior was to produce IR that did not verify (some use was not dominated by its def). PiperOrigin-RevId: 258928309		2019-07-19 11:40:25 -07:00
mlir	Uniformize the API for the mlir::tile functions on AffineForOp and loop::ForOp	2019-07-19 11:40:25 -07:00