jhuber6 wrote: > User confusion is only part of the issue here. With any single GPU choice we > would still potentially produce a nonworking binary, if our GPU choice does > not match what the user wants. > > "all GPUs" has the advantage of always producing the binary that's guaranteed > to work. Granted, in the case of multiple GPUs it comes with the compilation > time overhead, but I think it's a better trade-off than compiling faster, but > not working. If the overhead is unacceptable, then we can tweak the build, > but in that case, the user may as well just specify the desired architectures > explicitly.
I think the semantics of `native` on other architectures are clear enough here. This combined with the fact that using `-march=native` will error out in the case of no GPUs available, or give a warning if more than one GPU is available, should be sufficiently clear what it's doing. This obviously falls apart if you compile with `-march=native` and then move it off of the system you compiled it for, but the same applies for standard x64 binaries I feel. Realistically, very, very few casual users are going to be using direct NVPTX targeting. The current use-case is for building tests directly for the GPU without needing to handle calling `amdgpu-arch` and `nvptx-arch` manually in CMake. If I had this in, then I could simplify a lot of CMake code in my `libc` project by just letting the compiler handle the autodetection. Then one less random program dependency is removed from the build process. AMDGPU already has `-mcpu=native` so I'd like NVPTX to match if possible. https://github.com/llvm/llvm-project/pull/79373 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
