[llvm] [VectorCombine] New folding pattern for extract/binop/shuffle chains (PR #145232)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

@RKSimon Do you know where this pattern is generated from? If it is only introduced by SLP/LoopVec, can we just emit a reduction instead? Is this pattern left as is since the reduction is not supported by the target?


https://github.com/llvm/llvm-project/pull/145232