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Subject [GitHub] [incubator-tvm] tqchen opened a new pull request #5949: [TIR] Improve Let/LetStmt support.
Date Sun, 28 Jun 2020 00:09:14 GMT

tqchen opened a new pull request #5949:

   Let/LetStmt are useful primitives to create variable bindings.
   While let binding are harmful for simplification and integer analysis,
   they are useful for other cases:
   - C0: LetStmt is useful to represent a step that has side effect(e.g. call a PRNG)
   - C1: Let expression can be used to create deep nested expression for complicated functions.
   This PR improves the let support in the following ways:
   - Enable vectorization support for let
   - Change let simplification strategy to simplify the most trivial case
     while ignore more complicated cases(to avoid deep nest explosion)
   - Enhance arith module to handle const bound and modular set for let.
   The overall recommendation is to only use Let in the cases when necessary(C0, C1).

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