The fencei instruction creates a synchronization fence for the whole
instruction cache. It is included in the RVA23S64 set of instructions
but not in RVA23U64.

I don't think that this is an instruction that a compiler would
generate. But you may see it as assembly instruction.

As the instruction may be issued in unprivileged mode it might be wiser
to include it in the -march= parameter to avoid touching packages
loading code into memory like JIT engines.

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https://bugs.launchpad.net/bugs/2116086

Title:
  Build for RVA23U64 extension profile on RISC-V

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