[all-commits] [llvm/llvm-project] e5b191: [SLP]Improve/fix reodering for gather nodes with e...

[Andrew V. Tischenko via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e5b191a433902c3dd21cb10c18815b011d6cb1cb
      https://github.com/llvm/llvm-project/commit/e5b191a433902c3dd21cb10c18815b011d6cb1cb
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2021-12-13 (Mon, 13 Dec 2021)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/extracts-with-undefs.ll

  Log Message:
  -----------
  [SLP]Improve/fix reodering for gather nodes with extractelements/undefs.

If the gather node is a mix of undefvalues and exractelement
instructions, need to take the ordering for such nodes into account too.
It allows to reorder some (sub)trees and remove some extra shuffles,
improving overall vectorization.
Also, outlined common functionality into a separate function.

Differential Revision: https://reviews.llvm.org/D115358