[PATCH] D74322: GlobalISel: Extend narrowing to G_ASHR

[Jay Foad via Phabricator via llvm-commits]

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

In D74322#1871587 <https://reviews.llvm.org/D74322#1871587>, @foad wrote:

> I guess it's up to you, but given that we already have a constant folding MIR builder it seems silly to write (and test and review) extra code to handle cases that it could handle for you.


I was wrong. ConstantFoldingMIRBuilder only handles genuine constant folding like 3+4. It doesn't simplify degenerate cases like adding or shifting by 0.

LGTM.


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