Uday Bondhugula 0122a99cbb Affine expression analysis and simplification. ... Outside of IR/ - simplify a MutableAffineMap by flattening the affine expressions - add a simplify affine expression pass that uses this analysis - update the FlatAffineConstraints API (to be used in the next CL) In IR: - add isMultipleOf and getKnownGCD for AffineExpr, and make the in-IR simplication of simplifyMod simpler and more powerful. - rename the AffineExpr visitor methods to distinguish b/w visiting and walking, and to simplify API names based on context. The next CL will use some of these for the loop unrolling/unroll-jam to make the detection for the need of cleanup loop powerful/non-trivial. A future CL will finally move this simplification to FlatAffineConstraints to make it more powerful. For eg., currently, even if a mod expr appearing in a part of the expression tree can't be simplified, the whole thing won't be simplified. PiperOrigin-RevId: 211012256		2019-03-29 13:07:44 -07:00
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mlir-opt	Affine expression analysis and simplification.	2019-03-29 13:07:44 -07:00