[GitHub] [tvm] hzfan commented on issue #6691: [Performance] Performance regression with int64 indices INDEX_DEFAULT_I64=ON (PR #6143)

[GitBox <gi...@apache.org>]

hzfan commented on issue #6691:
URL: https://github.com/apache/tvm/issues/6691#issuecomment-738715741


   @tqchen The cast originates from https://github.com/apache/tvm/blob/main/src/te/schedule/operation_inline.cc#L67
   For example, before inline,
   ```
   for i from 0i32 to 10i32
     for j from 0i32 to 10i32
       T_add[i, j] = placeholder[i + j + 1i32, j]
   
   for i from 0i64 to 10i64
     for j from 0i64 to 10i64
       result[i, j] = T_add[i, j]
   ```
   
   after inline,
   
   ```
   result[i, j] = placeholder[cast(i32, i) + cast(i32, j) + 1i32, cast(i32, j)]
   ```
   
   Perhaps I can do something with the SumExpr in CanonicalSimplifier to simplify this case.


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