[llvm] r295378 - [LSR] Prevent formula with SCEVAddRecExpr type of Reg from Sibling loops

[Wei Mi via llvm-commits]

On Wed, Feb 22, 2017 at 3:46 PM, Davide Italiano <davide at freebsd.org> wrote:

> On Thu, Feb 16, 2017 at 1:27 PM, Wei Mi via llvm-commits
> <llvm-commits at lists.llvm.org> wrote:
> > Author: wmi
> > Date: Thu Feb 16 15:27:31 2017
> > New Revision: 295378
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=295378&view=rev
> > Log:
> > [LSR] Prevent formula with SCEVAddRecExpr type of Reg from Sibling loops
> >
>
> Sorry if I'm late, but our downstream branch was a little bit behind.
> With this test LTO time of some of our internal codebases skyrockets.
> running `llc` on the test attached takes ~7 seconds with the change
> reverted and I had to kill it after 10 minutes with the change in. Can
> you please take a look, and see if you can fix this easily (or
> revert?) I'd like to get our bots green again.
>
>
Sorry to break your bot. I can reproduce the problem and am looking at it.
Thanks for the testcase.

Wei.


>
> --
> Davide
>
> "There are no solved problems; there are only problems that are more
> or less solved" -- Henri Poincare
>
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