Implement MIPS3 target support

[KiritoDv]

It would be nice to have mips-3 support for some homebrew platforms like n64 or some modems.

Im not sure if this could be a good reference:
llvm/llvm-project#18632

https://clang.llvm.org/doxygen/Driver_2ToolChains_2Arch_2Mips_8cpp_source.html

[lerno]

How would we test it?

[KiritoDv]

Thats a good question, i can setup a few n64 and router firmware tests or an example program

[lerno]

I will probably want to test it from MacOS, are there any easy helpers to do that?

[KiritoDv]

Wdym by helper 0:?

[lerno]

Software that will help you run and emulate MIPS3 code on MacOS.

[KiritoDv]

Ohh, you could try ares which is an n64 emulator or an irix emulator https://forums.irixnet.org/thread-1012-post-7165.html

[lerno]

Looks non-trivial. Is there a way to bring this to CI?

[KiritoDv]

Yeah i think, my other idea was to use something like this https://github.com/gioannides/MIPS_SIMULATOR/tree/master, seems to be smaller than using a full emulator