cee1 edited a comment on pull request #405:
URL: https://github.com/apache/tvm/pull/405#issuecomment-1018239341
> Hi @tqchen , May I ask a question? Why should we erase for Variable op?
>
> void Visit_(const Variable* op) final { if (touched_.count(op)) {
touched_.erase(op); } }
We've experienced a problem due to this "touched_.erase(...)"
Background：Try to combine double buffer with cuda WMMA intrin, the TIR looks
like
```
for (k.outer.outer.outer: int32, 0, 2) {
attr [im2col_reshape.shared] "double_buffer_write" = 1;
for (...) {
xxx_shared[...] = place_holder[...] // load next part
}
}
...
for (...) {
@tir.tvm_load_matrix_sync(...,
@tir.tvm_access_ptr(@tir.type_annotation(, dtype=int8), xxx_shared, ...), ...)
}
```
Here, the CallNode `@tir.tvm_access_ptr` references VarNode `xxx_shared` as
its parameter.
Then, it will be removed from result of `DoubleBufferDetector`, aka
`touched_.erase(op)`
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