The currently continuously tested architectures are:
- aarch64
- amdgpu
- arm
- nvptx
- riscv32
- riscv64
- x86_64
i386 support is [in the works](llvm#93709).
See "Bringup on a New OS or Architecture" for more information. Please do first file a bug in our issue tracker before starting a port that you plan to upstream.