[PATCH] D86786: GlobalISel: Combine out redundant sext_inreg

[Amara Emerson via Phabricator via llvm-commits]

aemerson added a comment.

computeNumSignBits() does not mean that the value was sign extended. It only returns you the number of top-most bits that are known to be the same. As a result, this also ends up matching G_ZEXTLOAD which is a bug I hit in an earlier attempt at this.


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  https://reviews.llvm.org/D86786/new/

https://reviews.llvm.org/D86786