[llvm-dev] Status of the New Pass Manager

[Stephen Hines via llvm-dev]

The Android platform build (AOSP) has also switched to the new pass manager
recently. We do have a few bugs that we are chasing (hence opt-outs), but
it is working quite well otherwise.

Our current list of issues:
1) Libsqlite still has a mysterious failure that we haven't been able to
reduce well.
2) https://bugs.llvm.org/show_bug.cgi?id=42124 shows that inlining costs
are a bit different under NPM. https://reviews.llvm.org/D63034 is one
proposed patch for addressing this.
3) libpdfium exposed a non-determinism issue with NPM where having the
linux-libc-dev system package installed changes execution. We are still
looking at why this happens.
4) Sanitizer coverage information isn't supported by the NPM yet (
https://reviews.llvm.org/D62888).

Thanks,
Steve

On Mon, Jul 1, 2019 at 11:07 AM Alex Bradbury via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> On Thu, 27 Jun 2019 at 17:46, Philip Reames via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> >
> > For our downstream usage, we've switched entirely to the new pass
> manager.  We made the switch a couple of months ago.  All of our testing is
> being done with the NPM, and we're about to start deleting (downstream)
> code which was only needed by the legacy pass manager.
> >
> > I believe several other major contributors are in the same state.  We
> really need to get upstream switched over so that all of the community's
> testing efforts are aligned again.
>
> I hadn't realised it was so close to being ready. Do you see this as a
> switch that could be made before 9.0, or after it?
>
> Best,
>
> Alex
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