[all-commits] [llvm/llvm-project] bb13c3: [X86][AVX] Ensure we only combine to PSHUFLW/PSHUF...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: bb13c34c3aa100006461c972319abfef0af70603
      https://github.com/llvm/llvm-project/commit/bb13c34c3aa100006461c972319abfef0af70603
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2020-08-01 (Sat, 01 Aug 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp

  Log Message:
  -----------
  [X86][AVX] Ensure we only combine to PSHUFLW/PSHUFHW on supporting targets

Noticed while investigating combining from concatenated shuffle vectors, we weren't checking that PSHUFLW/PSHUFHW was legal - we were depending on lowering splitting to subvectors.