[all-commits] [llvm/llvm-project] fe6057: [AArch64] Custom lower concat(v4i8 load, ...)

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fe6057a29314cb2b50d9bd634cf8ec14eda54742
      https://github.com/llvm/llvm-project/commit/fe6057a29314cb2b50d9bd634cf8ec14eda54742
  Author: David Green <david.green at arm.com>
  Date:   2022-03-18 (Fri, 18 Mar 2022)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/insert-extend.ll
    M llvm/test/CodeGen/AArch64/insert-subvector.ll

  Log Message:
  -----------
  [AArch64] Custom lower concat(v4i8 load, ...)

We already have custom lowering for v4i8 load, which loads as a f32,
converts to a vector and bitcasts and extends the result to a v4i16.
This adds some custom lowering of concat(v4i8 load, ...) to keep the
result as an f32 and create a buildvector of the resulting f32 loads.
This helps not create all the extends and bitcasts, which are often
difficult to fully clean up.

Differential Revision: https://reviews.llvm.org/D121400