[LLVMdev] [cfe-dev] [3.6 Release] RC3 has been tagged

[Hal Finkel]

----- Original Message -----
> From: "Joerg Sonnenberger" <joerg at britannica.bec.de>
> To: cfe-dev at cs.uiuc.edu, "llvmdev" <llvmdev at cs.uiuc.edu>
> Sent: Wednesday, February 18, 2015 7:42:11 AM
> Subject: Re: [LLVMdev] [cfe-dev]  [3.6 Release] RC3 has been tagged
> 
> On Tue, Feb 17, 2015 at 11:12:20AM -0800, Hans Wennborg wrote:
> > I asked a few of the other developers, and the consensus was that
> > while unfortunate, we won't block the release on a perf regression
> > like this, at least not at this stage in the release process.
> 
> Wasn't the result of the discussion much stronger -- the performance
> regression seems to be more a result of hypersensitivity to specific
> code generation choices and less a fundamental issue?

There are several commits involved, and I don't believe we understand whether the issues are all hypersensitivity, or some other more systematic interactions. There is one issue, which involved a correctness fix for runtime unrolling that was done in a sub-optimal way (causing it to introduce an unnecessary comparison) that I think is well understood, and for which we have a fix (http://reviews.llvm.org/D7715). We should pick up this in the release. I think that, unfortunately, for the others, there's not sufficient time to investigate before the release.

 -Hal

> 
> Joerg
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