[llvm-branch-commits] [llvm] backport: [SLP]Improve reductions for copyables/split nodes (PR #187659)

[Pengcheng Wang via llvm-branch-commits]

wangpc-pp wrote:

> Does this issue cause incorrect code to be generated or is it simply less efficient codegen?

This commit fixed a performance regression from LLVM 21 to LLVM 22, that means it generated less efficient code.

https://github.com/llvm/llvm-project/pull/187659