[llvm] r309651 - [StackColoring] Update AliasAnalysis information in stack coloring pass

[Hal Finkel via llvm-commits]

On 08/02/2017 03:16 AM, Hiroshi 7 Inoue wrote:
>
> Hi,
>
> I updated my patch in Phabricator based on comments from Hal and Matthias.
> https://reviews.llvm.org/D35907
>
> I will commit the new patch if it looks ok for everyone.
>

Please commit the update. In the future, please don't commit a 
non-trivial change like this without an explicit approval.

Thanks again,
Hal

> Thank you.
>
> Hiroshi
>
> -----
> Hiroshi Inoue <inouehrs at jp.ibm.com>
> IBM Research - Tokyo
>
>
> hwennborg at google.com wrote on 2017/08/02 08:41:33:
>
> > From: Hans Wennborg <hans at chromium.org>
> > To: Hal Finkel <hfinkel at anl.gov>
> > Cc: Matthias Braun <matze at braunis.de>, Hiroshi Inoue
> > <inouehrs at jp.ibm.com>, llvm-commits <llvm-commits at lists.llvm.org>
> > Date: 2017/08/02 08:41
> > Subject: Re: [llvm] r309651 - [StackColoring] Update AliasAnalysis
> > information in stack coloring pass
> > Sent by: hwennborg at google.com
> >
> > On Tue, Aug 1, 2017 at 10:51 AM, Hal Finkel <hfinkel at anl.gov> wrote:
> > >
> > > On 08/01/2017 12:38 PM, Matthias Braun wrote:
> > >
> > > This is going a little fast, given that Hal had raised concerns 
> and the
> > > patch went in before he responded (at least it looks like that in 
> phab). I'd
> > > like to hear his opinion first, given that my experience with 
> alias analysis
> > > in LLVM is limited.
> > >
> > >
> > > I'd like to see this in 5.0, however, I just provided a 
> post-commit review
> > > and it looks like it will need a small update before merging.
> >
> > Sounds good. Thanks!
> >
> >
> >
> > > On Aug 1, 2017, at 10:15 AM, Hans Wennborg via llvm-commits
> > > <llvm-commits at lists.llvm.org> wrote:
> > >
> > > Matthias, the PR for this was marked as a release blocker for 5.0.
> > > What do you think about merging this?
> > >
> > > On Mon, Jul 31, 2017 at 8:32 PM, Hiroshi Inoue via llvm-commits
> > > <llvm-commits at lists.llvm.org> wrote:
> > >
> > > Author: inouehrs
> > > Date: Mon Jul 31 20:32:15 2017
> > > New Revision: 309651
> > >
> > > URL: http://llvm.org/viewvc/llvm-project?rev=309651&view=rev
> > > Log:
> > > [StackColoring] Update AliasAnalysis information in stack coloring 
> pass
> > >
> > > Stack coloring pass need to maintain AliasAnalysis information 
> when merging
> > > stack slots of different types.
> > > Actually, there is a FIXME comment in StackColoring.cpp
> > >
> > > // FIXME: In order to enable the use of TBAA when using AA in CodeGen,
> > > // we'll also need to update the TBAA nodes in MMOs with values
> > > // derived from the merged allocas.
> > >
> > > But, TBAA has been already enabled in CodeGen without fixing this 
> pass.
> > > The incorrect TBAA metadata results in recent failures in 
> bootstrap test on
> > > ppc64le (PR33928) by allowing unsafe instruction scheduling.
> > > Although we observed the problem on ppc64le, this is a platform 
> neutral
> > > issue.
> > >
> > > This patch makes the stack coloring pass maintains AliasAnalysis 
> information
> > > when merging multiple stack slots.
> > >
> > >
> > > (This is https://reviews.llvm.org/D35907)
> > > _______________________________________________
> > > llvm-commits mailing list
> > > llvm-commits at lists.llvm.org
> > > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
> > >
> > >
> > >
> > > --
> > > Hal Finkel
> > > Lead, Compiler Technology and Programming Languages
> > > Leadership Computing Facility
> > > Argonne National Laboratory
> >
>

-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory

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