[PATCH] D122909: [InstCombine] limit icmp fold with sub if other sub user is a phi

Sat Apr 2 15:26:14 PDT 2022

lebedev.ri added a comment.

In D122909#3424859 <https://reviews.llvm.org/D122909#3424859>, @spatel wrote:

> In D122909#3422897 <https://reviews.llvm.org/D122909#3422897>, @lebedev.ri wrote:
>
>> It seems like something for a late undo pass to deal with.
>
> Agree, but the comments in https://github.com/llvm/llvm-project/issues/54558 suggested there wasn't a quick fix, and there are already one-use limitations here, so that's why I proposed a fast fix for the regression. Do you object to this change?

No strong thoughts on this one. I just think it would be best to have a more general undo fold :)

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https://reviews.llvm.org/D122909