[llvm] [PowerPC] xxspltib hoist out of loop (PR #127121)

[zhijian lin via llvm-commits]

diggerlin wrote:

> In general this looks good to me. However, would be good if you can do a NFC pre-commit of the new test added, so this patch can show the changes.

I created a separated NFC patch for the new test case added. https://github.com/llvm/llvm-project/pull/127701

https://github.com/llvm/llvm-project/pull/127121