[all-commits] [llvm/llvm-project] 8fcb12: [PreISelIntrinsicLowering] Produce a memset_patter...

[Alex Bradbury via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8fcb1263f42657ecbc355beff12500dfbcddee17
      https://github.com/llvm/llvm-project/commit/8fcb1263f42657ecbc355beff12500dfbcddee17
  Author: Alex Bradbury <asb at igalia.com>
  Date:   2025-01-30 (Thu, 30 Jan 2025)

  Changed paths:
    M llvm/lib/CodeGen/PreISelIntrinsicLowering.cpp
    A llvm/test/Transforms/PreISelIntrinsicLowering/X86/memset-pattern.ll

  Log Message:
  -----------
  [PreISelIntrinsicLowering] Produce a memset_pattern16 libcall for llvm.experimental.memset.pattern when available (#120420)

This is to enable a transition of LoopIdiomRecognize to selecting the
llvm.experimental.memset.pattern intrinsic as requested in #118632 (as
opposed to supporting selection of the libcall or the intrinsic). As
such, although it _is_ a TODO to add costing considerations on whether
to lower to the libcall (when available) or expand directly, lacking
such logic is helpful at this stage in order to minimise any unexpected
code gen changes in this transition.



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