[all-commits] [llvm/llvm-project] ea59d1: [X86] getFauxShuffleMask - always match insert_sub...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ea59d17a2afc087315e68dca59f608d4ed73c300
      https://github.com/llvm/llvm-project/commit/ea59d17a2afc087315e68dca59f608d4ed73c300
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-03-06 (Thu, 06 Mar 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-partial-undef.ll

  Log Message:
  -----------
  [X86] getFauxShuffleMask - always match insert_subvector(insert_subvector(undef,sub,0),sub,c) 'subvector splat' patterns (#130115)

The plan is to remove the vXi64 cross lane shuffle constraint entirely, but this special 'splat' case was easy to handle while I fight the remaining regressions.



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