Interprocedural optimizations (IPOs) have been historically weak in LLVM. The strong reliance on inlining can be seen as a consequence or cause. Since inlining is not always possible (parallel programs) or beneficial (large functions), the effort to improve IPO has recently seen an upswing again [0,1,2]. In order to capitalize this momentum, we would like to talk about the current situation in LLVM, and goals for the immediate, but also distant, future.
This open-ended discussion is not aimed at a particular group of people. We expect to discuss potential problems with IPO, as well as desirable analyses and optimizations, both experts and newcomers are welcome to attend.
[0] https://lists.llvm.org/pipermail/llvm-dev/2018-August/125537.html [1] These links do not yet exist but will be added later on. [2] One link will be an RFC outlining missing IPO capabilities, the other will point to a function attribute deduction rewrite patch (almost finished).
