[PATCH] D96646: [NFC] update LangRef for D88645

[Tyker via Phabricator via llvm-commits]

Tyker added a comment.

In D96646#2594843 <https://reviews.llvm.org/D96646#2594843>, @andrew.w.kaylor wrote:

> I'm not trying to be difficult, but I genuinely still don't understand the additional arguments pointer. Is it intended to allow proprietary extensions? Is there an example somewhere?
>
> If these intrinsics are meant as a general mechanism to enable arbitrary communication between custom front ends and custom optimization passes, that's fine. I'd just like to see something explicitly explaining that.

the pointer is to a global struct containing the the provided arguments. I use it to communicate from source code to custom passes. but the front-end doesn't need to be custom. since the code to generate theses extra arguments is in clang trunk.
here is a basic example: https://godbolt.org/z/Tavcv9.
the major benefit I see is that it can pass arbitrary information and works well with template and constexpr programing. but the front-end does not do any semantic checking on the meaning of the information.


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https://reviews.llvm.org/D96646