[llvm-dev] RFC: Memcpy inlining in IR

[Roman Lebedev via llvm-dev]

On Thu, Jun 20, 2019 at 6:42 AM Amara Emerson via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> Hi all,
>
> For GlobalISel, we’re exploring options for implementing inlining optimizations for memcpy and friends. However, looking around the existing implementation, I don’t see anything that would particularly be problematic for us to do it at the IR level.
>
> The existing TLI hooks to specify how certain memcpy calls should be lowered doesn’t have anything too SelectionDAG specific, and an IR lowering pass could be shared in future between SDAG and GISel. Does anyone see issues with this?
Sounds similar to https://reviews.llvm.org/D60318
It should be done *really* late in the middle-end pipeline though.

> Thanks,
> Amara
Roman.

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