[all-commits] [llvm/llvm-project] ef4604: [X86] combineConcatVectorOps - add handling for X8...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ef46046060352745504877b3b07bca1305a3eb58
      https://github.com/llvm/llvm-project/commit/ef46046060352745504877b3b07bca1305a3eb58
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2023-08-11 (Fri, 11 Aug 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/x86-interleaved-access.ll

  Log Message:
  -----------
  [X86] combineConcatVectorOps - add handling for X86ISD::VPERM2X128 nodes.

On AVX512 targets we can concatenate these and create a X86ISD::SHUF128 node.

Prevents regression on some future work to improve codegen for concat_vectors(extract_subvector(),extract_subvector()) (mainly via vector widening) patterns.