It seems that for Windows `sizeof(long)=4` ([here](https://docs.microsoft.com/en-us/cpp/cpp/data-type-ranges?view=vs-2019)) while it is typically 8 for other platforms. Since `longlong3` and `longlong4` are now supported since CUDA 10, maybe you can try replace [L247](https://github.com/apache/incubator-tvm/blob/65224d9a67fc93919421e485771ec67e50c58543/src/target/source/codegen_cuda.cc#L247) to something like ``` if (t.lanes() == 3){ os << "longlong3"; }else{ os << "longlong4"; } ``` , if you need `int64` support.
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