[all-commits] [llvm/llvm-project] 6984cf: [X86] Ensure concat(blendi(), blendi()) -> vselect(...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6984cfea6c888965bb45d046abbb97ddb0443955
      https://github.com/llvm/llvm-project/commit/6984cfea6c888965bb45d046abbb97ddb0443955
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-03-25 (Tue, 25 Mar 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    A llvm/test/CodeGen/X86/pr132844.ll

  Log Message:
  -----------
  [X86] Ensure concat(blendi(),blendi()) -> vselect() uses legal select mask types

For 256-bit selections, we could be using sub-i8/vXi8 selection condition masks - extend these to i8 and then extract the lowest mask subvector

Fixes #132844



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