[all-commits] [llvm/llvm-project] 644d56: [X86] Recognise ROTLI/ROTRI rotations as faux shuf...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 644d56b432bf6f50faa9638ec1b75e9d7ed3d6d4
      https://github.com/llvm/llvm-project/commit/644d56b432bf6f50faa9638ec1b75e9d7ed3d6d4
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2020-02-09 (Sun, 09 Feb 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-shuffle-combining-avx512bwvl.ll
    M llvm/test/CodeGen/X86/vector-shuffle-combining-xop.ll

  Log Message:
  -----------
  [X86] Recognise ROTLI/ROTRI rotations as faux shuffles

Allows us to combine rotations with shuffles.

One of many things necessary to fix PR44379 (lowering shuffles to rotations)