[all-commits] [llvm/llvm-project] 0bd098: [X86] Fold VPERMV3(WIDEN(X), M, WIDEN(Y)) -> VPERMV(...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0bd098b1cce62ad63eb63f7e57c3a55ccfaf7e0c
      https://github.com/llvm/llvm-project/commit/0bd098b1cce62ad63eb63f7e57c3a55ccfaf7e0c
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-01-14 (Tue, 14 Jan 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/shuffle-vs-trunc-512.ll
    M llvm/test/CodeGen/X86/vector-interleaved-store-i64-stride-4.ll

  Log Message:
  -----------
  [X86] Fold VPERMV3(WIDEN(X),M,WIDEN(Y)) -> VPERMV(CONCAT(X,Y),M') iff the CONCAT is free (#122750)

Minor followup to #122485 - if the source operands were widened half-size subvectors, then attempt to concatenate the subvectors directly, and then adjust the shuffle mask so references to the second operand now refer to the upper half of the concat result.



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