[PATCH] D111839: [AArch64][GlobalISel] combine and + [la]sr => [su]bfx

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

In D111839#3066249 <https://reviews.llvm.org/D111839#3066249>, @foad wrote:

> it would be better just to remove the `and` and leave it as an `ashr`.

... and that should be done by a general demanded bits analysis, which could spot that the `and` is redundant.


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