[all-commits] [llvm/llvm-project] fbb51a: [X86] LowerShift - lower some shuffles directly to...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fbb51ac0ba1007250cba384d930ae965e395b657
      https://github.com/llvm/llvm-project/commit/fbb51ac0ba1007250cba384d930ae965e395b657
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-07-06 (Wed, 06 Jul 2022)

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

  Log Message:
  -----------
  [X86] LowerShift - lower some shuffles directly to X86ISD::PSHUFLW nodes.

These are expected to lower to X86ISD::PSHUFLW but we were seeing some regressions in D129150 because it'd managed to exploit the masking of the shift amounts to create unintended clear masks instead.