[BUG] Disordered header files: detail::is_prefetch used before declaration.

[rchardx]

Describe the bug Disordered header files (use before declaration) in latest CUTLASS version. If cute/algorithm/prefetch.hpp was included, eventually it will include cutlass/include/cute/arch/copy_sm90_tma.hpp. This included file uses detail::is_prefetch<CopyOp> while detail::is_prefetch is defined in cute/algorithm/prefetch.hpp but not included yet.

Including link: cute/algorithm/prefetch.hpp -> cute/tensor.hpp -> cute/algorithm/copy.hpp -> cutlass/include/cute/atom/copy_atom.hpp -> cutlass/include/cute/atom/copy_traits_sm90_tma.hpp

Steps/Code to reproduce bug Add

#include "cute/algorithm/prefetch.hpp"

to any example file. For example, in 57_hopper_grouped_gemm:

Expected behavior Compilation error occurs:

Environment details (please complete the following information):

• CUTLASS: 7d49e6c7e2f8896c47f586706e67e1fb215529dc
• CUDA 12.4
• GCC 11.4

[rchardx]

In my opinion, These files (copy/prefetch/...) should not included in cute/tensor.hpp at the end of file:

Doing so will let #include "cute/tensor.hpp" introdce too many related objects, declarations, and finally uses of undefined objects causing compilation errors.

[thakkarV]

generally, we like to avoid including internal cute headers directly. is your issue resolved if you include cute/tensor.hpp ? as you noted, tensor.hpp includes prefetch already so you should not have to.

[rchardx]

generally, we like to avoid including internal cute headers directly. is your issue resolved if you include cute/tensor.hpp ? as you noted, tensor.hpp includes prefetch already so you should not have to.

Yes, it's resolved. Yet normal users could still get wrong. If the header files are intended to look like this, CUTLASS should let the preprocessor to generate an error message and causes the compilation to fail when any internal headers are included.

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