[llvm-dev] Status of the New Pass Manager

[Hiroshi Yamauchi via llvm-dev]

I don't exactly remember when I last tried it and I didn't realize
there was r342896. I'll check it out. Thanks.

On Wed, Jul 10, 2019 at 1:14 PM Philip Pfaffe <philip.pfaffe at gmail.com> wrote:
>
> Printing was implemented in r342896.
> @Hiroshi: Are there specific issues or limitations you encountered with it?
>
> Cheers,
> Philip
>
> On Wed, Jul 10, 2019 at 8:48 PM Troy Johnson via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>>
>> -print-after-all is very useful for debugging and learning about LLVM.  I would hope that would be implemented for the new PM before removing the old PM.  I'd personally consider it a blocker.
>>
>> -Troy
>>
>> > -----Original Message-----
>> > From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Eric Christopher
>> > via llvm-dev
>> > Sent: Tuesday, July 09, 2019 7:40 PM
>> > To: Hiroshi Yamauchi <yamauchi at google.com>
>> > Cc: llvm-dev <llvm-dev at lists.llvm.org>; Yi Kong <yikong at google.com>
>> > Subject: Re: [llvm-dev] Status of the New Pass Manager
>> >
>> > They don't, but this isn't considered a blocker to removing the old one as far as I
>> > know.
>> >
>> > -eric
>> >
>> > On Tue, Jul 9, 2019 at 11:09 AM Hiroshi Yamauchi via llvm-dev <llvm-
>> > dev at lists.llvm.org> wrote:
>> > >
>> > > FWIW, the flags like -print-after, -printer-after-all don't work well
>> > > with the new pass manager last time I checked.
>> > >
>> > > On Mon, Jul 8, 2019 at 12:20 PM Stephen Hines via llvm-dev
>> > > <llvm-dev at lists.llvm.org> wrote:
>> > > >
>> > > > 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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>> > > >
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