[llvm] 4b33b23 - Reapply "[LV] Vectorize (some) early and multiple exit loops"" w/fix for builder

[Florian Hahn via llvm-commits]

Hi,

> On 8 Apr 2021, at 19:17, Philip Reames <listmail at philipreames.com> wrote:
> 
> This isn't a regression in this change, we're exposing an existing issue at higher frequency.  I reduced a test which doesn't involve this change, and filed a bug for it.  https://bugs.llvm.org/show_bug.cgi?id=49900 <https://bugs.llvm.org/show_bug.cgi?id=49900>
> 
Oh that’s interesting, thanks for taking a look. I think there might be an existing bug for a similar/identical issue. Let me try to find it and link it in Guggilla.
> Florian, I'm willing to take a shot at fixing this, but need a bit of help.  Would you have a couple minutes to debate ideas on how the vectorizer should be structured to avoid querying SCEV over partially constructed IR?
> 
Unfortunately I won’t have time in the next few days, but I’ll try to take a look early next week. Perhaps it would be worth syncing up mid next week?

Cheers,
Florian
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