[PATCH] D33543: Re-enable "[SCEV] Do not fold dominated SCEVUnknown into AddRecExpr start"

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev added a comment.

Sanjoy, what happens is nearly following: without the change, LSR was making an overconfident simplification basing on a wrong SCEV. Apparently it did not need the IV analysis to do this. With the change, it chose a different way to simplify (that wasn't so confident), and this way required the IV analysis.


https://reviews.llvm.org/D33543