[all-commits] [llvm/llvm-project] a95a81: [AArch64] Lower fixed-length vector_shuffle to SVE...

[Benjamin Maxwell via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a95a8188e897df282b3cf1e79bd46ec095591a44
      https://github.com/llvm/llvm-project/commit/a95a8188e897df282b3cf1e79bd46ec095591a44
  Author: Benjamin Maxwell <benjamin.maxwell at arm.com>
  Date:   2022-11-16 (Wed, 16 Nov 2022)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/sve-fixed-length-shuffles.ll
    M llvm/test/CodeGen/AArch64/sve-fixed-length-splat-vector.ll
    M llvm/test/CodeGen/AArch64/sve-streaming-mode-fixed-length-extract-subvector.ll
    M llvm/test/CodeGen/AArch64/sve-streaming-mode-fixed-length-shuffle.ll

  Log Message:
  -----------
  [AArch64] Lower fixed-length vector_shuffle to SVE splat if possible

This adds an extra case to check if a vector_shuffle for a fixed-length
vector that's being lowered to SVE, is just a splat. Doing this avoids
a round trip to the stack and back for a few cases.

Reviewed By: c-rhodes

Differential Revision: https://reviews.llvm.org/D137966