[llvm-bugs] [Bug 47457] LoopLoadElim: assert failed "cast<Ty>() argument of incompatible type!"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47457

Max Kazantsev <max.kazantsev at azul.com> changed:

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

--- Comment #3 from Max Kazantsev <max.kazantsev at azul.com> ---
[LoopLoadElim] Filter away candidates that stop being AddRecs after loop
versioning. PR47457

The test in PR47457 demonstrates a situation when candidate load's pointer's
SCEV
is no loger a SCEVAddRec after loop versioning. The code there assumes that it
is
always a SCEVAddRec and crashes otherwise.

This patch makes sure that we do not consider candidates for which this
requirement
is broken after the versioning.

Differential Revision: https://reviews.llvm.org/D87355
Reviewed By: asbirlea

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