[llvm-dev] Switching to the New Pass Manager by Default

Chandler Carruth via llvm-dev llvm-dev at lists.llvm.org
Fri Aug 2 10:41:04 PDT 2019

On Fri, Aug 2, 2019 at 10:25 AM Leonard Chan via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hello all,
> As of now, all LLVM and Clang tests have been updated/addressed to run
> under the new/experimental pass manager (at least the ones that failed when
> using the new PM).
> For those who aren't aware of what the new pass manager (PM) is, the tl;dr
> is that this will serve as a replacement for the legacy PM, and promises
> faster build times by restructuring how passes are run over IR units. For
> some time, when someone wants to create a new pass, they may need to
> implement it for both pass managers since the legacy one is what is enabled
> by default. Passes that were initially made under the new PM have also
> slowly been ported over time.
> Now that LLVM 9.0.0 has branched, we have about 6 months before the next
> release. We think it would be a good idea to take this opportunity and make
> the new PM the default one which gives us enough time to work out any kinks
> that might come out of this switch before LLVM 10.0.0 branch point. We
> suspect that there may be other LLVM projects that will be affected by
> this, probably from unported passes.
> Does anyone have any opinions on this?

I just wanted to say: huge +1 from me, and a huge thanks to you and several
others who have been working tirelessly to track down the long tail of
issues and get them resolved so we could get to this point.
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