spectrometerHBH commented on a change in pull request #9699:
URL: https://github.com/apache/tvm/pull/9699#discussion_r772835045
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File path: src/arith/iter_affine_map.cc
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@@ -347,11 +372,24 @@ class IterMapRewriter : public ExprMutator {
// IterSplit(k,
scale=1)),
// extent=9)
// scale=1))
- std::unordered_map<IterSumExpr, IterMark, IterSumHash, IterSumEqual>
sum_fuse_map_;
+ // Example(2): expr = i*9 + j*2 + k, i in [0, 4) j in [0, 5) k in [0, 2)
+ // predicate: 1 <= j*2 + k < 9
+ // Then, flattened form = IterSum(IterSplit(i, scale=9),
+ // IterSplit(j, scale=2),
+ // IterSplit(k, scale=1))
+ // normal form = IterSum(IterSplit(i, scale=9),
Review comment:
Then I think you might need to add more test cases to test the sanity.
Such as what if we try to fuse several iters all with lower bound
constraints.
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