[PATCH] D153202: [LSR] Return nullptr from getExpr if the result isn't invertible.

[Quentin Colombet via Phabricator via llvm-commits]

qcolombet accepted this revision.
qcolombet added a comment.
This revision is now accepted and ready to land.

I was wondering if we should have a separate `isInvertible` API and keep `getExpr` as is, but a glance at how `getExpr` is used everywhere tells me that's probably overkill.

LGTM


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https://reviews.llvm.org/D153202