When performing constant folding on the affineApplyOp, there is a
division of 0 in the affine map.
[related issue](https://github.com/llvm/llvm-project/issues/64622)
---------
Co-authored-by: Javier Setoain <jsetoain@users.noreply.github.com>
Generalize affine fusion to work at any inner depth; fusing loops inside
other
affine.for or even inside scf.for or scf.while nests. Apply in post
order on
all affine nests on the pass' top-level operation.
Fix MDG init for blocks inside other affine nests.
Relax unnecessary requirement for unique vars during merge and align of
FlatLinearValueConstraints. There are several cases where
FlatLinearValueConstraints need to have duplicate Values for the
dimensions:
for eg. in dependence relation systems with source and destination
accesses
could have common loop IVs. `mergeAndAlign` can be done even in the
presence
of Values reappearing by simply aligning from left to right in that
order.
While at this, drop outdated comments; improve some debug messages.
Matrix has been templated to Matrix (for MPInt and Fraction) with
explicit instantiation for both these types.
IntMatrix, inheriting from Matrix<MPInt>, has been created to allow for
integer-only methods.
makeMatrix has been duplicated to makeIntMatrix and makeFracMatrix.
This was already landed previously but was reverted in
98c994c8e22d7f38cc04f56ee5cdeb337734414d due to build failure. This
fixes the failure.
The method implementations remain in the .cpp file; explicit instantiations have been added for these two types.
makeMatrix has been duplicated to makeIntMatrix and makeFracMatrix.
Fix a bug in detecting unknown ids as mods of known ids that was
preventing certain fusions.
While at this, fix the function signature of `detectAsMod` function to
have output as the last argument.
Reviewed By: bondhugula
Differential Revision: https://reviews.llvm.org/D152055
`BoundType` is no longer a nested member of `IntegerRelation` but a top-level enum in the `presburger` namespace.
This allows `BoundType` to be predeclared in header files. Nested members cannot be predeclared.
Differential Revision: https://reviews.llvm.org/D146210
The new class hierarchy is as follows:
* `IntegerRelation` (no change)
* `IntegerPolyhedron` (no change)
* `FlatLinearConstraints`: provides an AffineExpr-based API
* `FlatLinearValueConstraints`: stores an additional mapping of non-local vars to SSA values
* `FlatAffineValueConstraints`: provides additional helper functions for Affine dialect ops
* `FlatAffineRelation` (no change)
`FlatConstraints` and `FlatValueConstraints` are moved from `MLIRAffineAnalysis` to `MLIRAnalysis` and can be used without depending on the Affine dialect.
This change is in preparation of D145681, which adds an MLIR interface that depends on `FlatConstraints` (and cannot depend on the Affine dialect or any other dialect).
Differential Revision: https://reviews.llvm.org/D146201
