[llvm-bugs] [Bug 36321] Merge r324195 into the 6.0 branch: [LV] Use Demanded Bits and ValueTracking for reduction type-shrinking

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36321

Hans Wennborg <hans at chromium.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #7 from Hans Wennborg <hans at chromium.org> ---
(In reply to Chad Rosier from comment #6)
> Following up on Michael's comments.. the bug was filed in Dec '17, but the
> code that introduced the bug was committed in Aug. '15 (at least based on
> the comments in PR35734), so this doesn't look to be a 5.0 regression.
> 
> I agree this is a non-trivial change.  I'll let Hans decide if this should
> be included in 6.0.0 or 6.0.1.

It's been very quiet since this landed on trunk, so I went ahead and merged it
in 
 r325508.

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