[cfe-dev] [cfe-dev c++] Creating additional compiler intrinsics

[connor horman via cfe-dev]

Hello cfe-dev list,
I am currently working on a fork of llvm to implement a paper I'm
submitting to C++. The paper provides a magic standard-library function,
however to implement the function, I need an intrinsic. I was looking for
the steps necessary for, and some guidance towards, implementing that in
clang. Specifically, it interacts with the compiler, so it would need to be
a clang intrinsic, rather than an llvm intrinsic.
The intrinsic behavior is as follows:
* In constant evaluation, emit a failing diagnostic with a string_view and
source_location parameter when evaluated.
* In other contexts, same as __builtin_unreachable() (unconditional UB at
runtime).
Thank you all for your time and any help you can provide.
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