[llvm] [SDAG] Shrink (abds (sext x) (sext y)) (PR #171865)

[David Green via llvm-commits]

davemgreen wrote:

> I think you wanted something like https://alive2.llvm.org/ce/z/5ZL4AN.

And an updated version that works with undef, using min/max: https://alive2.llvm.org/ce/z/maryYU

https://github.com/llvm/llvm-project/pull/171865