[llvm-dev] Optimization Pass to Split a "Merge" Block

[Momchil Velikov via llvm-dev]

Sounds like tail duplication , lib/CodeGen/TailDuplication.cpp

On Sat, Jun 22, 2019 at 8:19 PM William Moses via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
>
> Is there an existing optimization in LLVM that will get split or rid of
> the "merge" block into the cases of where it's from.
>
> Evidently doing this for all cases could result in a blowup of code, but
> perhaps this exists somewhere for more limited cases (for example where the
> merge block could be eliminated entirely).
>
> Cheers,
> Billy Moses
>
> A:
>    ...
>   br merge
>
> B:
>   ...
>   br merge
>
> merge:
>   %var = phi [%a, A], [%b, B]
>   %wherefrom = phi [true, A], [false, B]
>    br cond %wherefrom A2, B2
>
> A2:
>   ....
>
> B2:
>   ....
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