[llvm] IR: teach implied-by-matching-cmp about samesign (PR #120120)

[Nikita Popov via llvm-commits]

nikic wrote:

> Since all callers of these functions operate on CmpInst::Predicate, this patch does not introduce functional changes.

Can you please update the callers so that it *does* introduce functional changes and we can test this code?

https://github.com/llvm/llvm-project/pull/120120