[PATCH] D119061: [Clang] noinline call site attribute

Jakub Kuderski via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Thu Feb 10 14:16:29 PST 2022

kuhar added a comment.

In D119061#3312571 <https://reviews.llvm.org/D119061#3312571>, @xbolva00 wrote:

>>> Do you plan to also add inline and flatten?
> You mean always_inline? Yes, after noinline. The flatten call site attribute - theoretically why not, but it needs to be reworked in LLVM (like always_inline_recursively) before any patch like this one.


>>> When I worked on my implementation, I remember that I also ran into the issue of conflicting attributes. I defaulted to whatever the inliner behavior was at the time, but a few folks pointed out to me that this can be very confusing. I think this needs thorough documentation / testing.
> Yes, as we mentioned it already, for example always_inline on decl, and noinline on callsite. We should diagnose these cases and always prefer call site attribute. (and as I said, some fixes for inliner are needed).

It would be good to check with a language expert if this can break some code. I'm thinking of situations when someone relies on a function being emitted (or not) and ending up with linking issues. I'm not an expert here, but this is a past concern I vaguely remember.



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