[llvm-dev] [RFC] Add a module inliner

[David Blaikie via llvm-dev]

+a couple of folks who might have some thoughts/ideas here

On Tue, Aug 24, 2021 at 8:57 AM Liqiang Tao via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> In my GSoC 2021, my goal is to evaluate the value of different callsite
> visiting orderings, which is inspired by paper[1][2]. I've already
> enabled doing such an exploration within the constraints of the current SCC
> inliner (https://reviews.llvm.org/D104028). Exploring more advanced
> callsite orderings is not possible with the current SCC inliner. The
> current SCC inliner runs on each SCC in a bottom-up traversal, which means
> that the inline order is limited to a bottom-up order.
>
> To address this limitation, I would like to add a module inliner, which
> processes all call sites in a given module at a time instead of a given
> SCC. This gives us flexibility on the order in which we process call sites.
>
> The module inliner would be disabled by default, to minimize code churn to
> the existing codebase and make it easier to remove it. Also, to avoid
> unnecessary abstractions, which would complicate the existing codebase,
> some code is copied from SCC inliner. Lastly, to foster collaboration, I
> would propose landing it in trunk rather than a branch.
>
> Best wishes,
>
> Liqiang Tao
>
> ---- [1] Aleksandar Prokopec, Gilles Duboscq, David Leopoldseder, and
> Thomas Würthinger. 2019. An optimization-driven incremental inline
> substitution algorithm for just-in-time compilers. In Proceedings of the
> 2019 IEEE/ACM International Symposium on Code Generation and Optimization
> (CGO 2019). [2] Dhruva R. Chakrabarti and Shin-Ming Liu. 2006. Inline
> Analysis: Beyond Selection Heuristics. In Proceedings of the International
> Symposium on Code Generation and Optimization (CGO '06).
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