[llvm-branch-commits] [llvm] [AMDGPU] Fix sign confusion in performMulLoHiCombine (PR #106977)

[Jay Foad via llvm-branch-commits]

jayfoad wrote:

> > Is this PR a fix for a regression or a critical issue?
> 
> No, I believe it has been broken for about 3 years (since [d7e03df](https://github.com/llvm/llvm-project/commit/d7e03df719464354b20a845b7853be57da863924)) but it was only reported to me recently.
> 
> I guess this means it is not appropriate for 19.1.0.

Cc @marekolsak FYI.

https://github.com/llvm/llvm-project/pull/106977