[all-commits] [llvm/llvm-project] db505c: [AArch64] Custom lower v4i8 subreg extract.

[David Green via All-commits]

  Branch: refs/heads/users/davemgreen/gh-a64-v4i8subvec
  Home:   https://github.com/llvm/llvm-project
  Commit: db505c8540e5cedc0b8b18ac6f976b28bd369b06
      https://github.com/llvm/llvm-project/commit/db505c8540e5cedc0b8b18ac6f976b28bd369b06
  Author: David Green <david.green at arm.com>
  Date:   2025-04-01 (Tue, 01 Apr 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/aarch64-load-ext.ll
    M llvm/test/CodeGen/AArch64/aarch64-neon-vector-insert-uaddlv.ll
    M llvm/test/CodeGen/AArch64/add.ll
    M llvm/test/CodeGen/AArch64/andorxor.ll
    M llvm/test/CodeGen/AArch64/bitcast-extend.ll
    M llvm/test/CodeGen/AArch64/ctlz.ll
    M llvm/test/CodeGen/AArch64/extbinopload.ll
    M llvm/test/CodeGen/AArch64/insert-subvector.ll
    M llvm/test/CodeGen/AArch64/itofp.ll
    M llvm/test/CodeGen/AArch64/load.ll
    M llvm/test/CodeGen/AArch64/mul.ll
    M llvm/test/CodeGen/AArch64/sub.ll
    M llvm/test/CodeGen/AArch64/sve-fixed-length-masked-gather.ll
    M llvm/test/CodeGen/AArch64/sve-fixed-length-masked-scatter.ll
    M llvm/test/CodeGen/AArch64/vector-fcvt.ll

  Log Message:
  -----------
  [AArch64] Custom lower v4i8 subreg extract.

A v4i8 extract will usually be scalarized. This prevents that during lowering,
converting it to an anyext and larger v4i16 subvector extract. There are a few
minor regressions that are fixed up in a followup.



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