This reminded me of a similar project for Emacs called RMSbolt[1], which was apparently rewritten by João Távora (author of Eglot, Sly, yasnippet) and called Beardbolt [2]

[1] https://gitlab.com/jgkamat/rmsbolt

[2] https://github.com/joaotavora/beardbolt

Thanks for letting me know. RMSBolt is a nice plugin which provides many languages and smooth interaction. It also inspired me that I can do more on real time editing of the input.

It might be unrelated, but VS Code is getting detachable windows. (https://leonardomontini.dev/multi-window-vscode/)

This extension is asking me to write two clang commands (through a very basic UI) to compare their output and requires clicking and waiting to see changes instead of running on every keystroke, so it's not quite like Compiler Explorer. It seems that you started out interested in exploring LLVM's Intermediate Representation and different clang options. If you made the extension require no configuration (c_cpp_properties.json will already contain all the information needed to compile my code) and it ran on every keystroke, I think that's what people want. An extension for C programmers to quickly see what their C code actually becomes.

Also, there is no need to put "VSCode" in the name of a VS Code extension.

This tool is intended for people working on the compiler itself.