LLVM for 8 bit controller

Hi,

Can I get information on which all 8 bit controllers are currently supported by LLVM
project and which are planned (development in progress)?

Moreover, I would also like to know, how popular is LLVM for 8 bit controller and
what are the advantages of using LLVM over GCC (specifically for 8 bit controllers).

We are trying to explore LLVM and would like to gather as much information as
possible.

Thank you.

Regards,
Prafulla

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