wrongtest commented on code in PR #11287:
URL: https://github.com/apache/tvm/pull/11287#discussion_r880006145
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include/tvm/arith/iter_affine_map.h:
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@@ -259,53 +259,29 @@ class IterSumExpr : public IterMapExpr {
TVM_DEFINE_OBJECT_REF_COW_METHOD(IterSumExprNode);
};
+/*! \brief Mapping level for iterators. */
+enum IterMapLevel {
Review Comment:
Yeah, we also have some case like `A[i // 8] = B[i % 16]` which could lower
to some hw-specified data movement intrin. If we consider the mapping `i // 8`
-> `i % 16` it could be neither surjective nor injective. But now the
`DetectIterMap` try to solve the mapping from iter variables of non-strided
domain to iter expression, thus I think it may not be able to handle such
things directly. Maybe we can consider extent the input argument to two group
of indices in the future?
Currently we handle it via bi-directional analysis from/to variable `i`:
i -> i // 8 : surjective
i -> i % 16: surjective, and injective reversely
Thus i // 8 -> i % 16 is something can be composed of surjective mapping and
injective mapping.
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