[GitHub] [incubator-tvm] yzhliu edited a comment on issue #4765: [tir] make IterVar extends Var

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yzhliu edited a comment on issue #4765: [tir] make IterVar extends Var
URL: https://github.com/apache/incubator-tvm/pull/4765#issuecomment-578281104
 
 
   @tqchen another problem is currently we rely on `IterVar->var` to propagate variables from the very beginning, e.g., 
   ```
   rv = tvm.reduce_axis(...)
   Y = sum(X[rv], axis=rv)
   ```
   
   However, `rv` could be replaced during the pass, it cause problem when we use the original `rv` to access array 
   
   one example of replacing: https://github.com/apache/incubator-tvm/blob/master/src/tir/ir/expr_functor.cc#L206-L208
   
   rethink about the scenario, I feel it is actually not a bad idea to have `Var` as a member of `IterVar`,  it simplifies the problem.

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