Tighten split's extent#4931

Merged

merrymercy merged 9 commits intoapache:masterfrom

yongfeng-nv:split-node-min-range-only-at-final-pass

Mar 4, 2020

Commits on Mar 3, 2020

Set split node's range to minimum of ext and split factor or split nparts, but only when PassDownDomain is called with allow_missing == false, i.e. by InferBound. Add a helper PassUpThreadBinding(…
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Enhance LoopVectorizer for vectorizing by 0. Found at least one case from testtopi/tests/python/test_topi_transform.py::test_tile.
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Revert changes vectorize_loop.cc; when parent's ext is zero, set split's range to the factor or nparts.
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Update with comments.
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Refactor the ext tightening predicate.
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Fix reference types.
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Integrate tvm.te changes.
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Trivial comment change to trigger CI.
yongfeng-nv
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Commits on Mar 4, 2020

Trivial comment correction to trigger testing.
yongfeng-nv
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