[all-commits] [llvm/llvm-project] 18bb17: [AArch64] Add costs for LD3/LD4 shuffles.

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 18bb175428f520aaa4a5e388bd3b680a1a7c60c0
      https://github.com/llvm/llvm-project/commit/18bb175428f520aaa4a5e388bd3b680a1a7c60c0
  Author: David Green <david.green at arm.com>
  Date:   2024-04-21 (Sun, 21 Apr 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
    M llvm/include/llvm/IR/Instructions.h
    M llvm/lib/CodeGen/InterleavedAccessPass.cpp
    M llvm/lib/IR/Instructions.cpp
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/AArch64/shuffle-load.ll

  Log Message:
  -----------
  [AArch64] Add costs for LD3/LD4 shuffles.

Similar to #87934, this adds costs to the shuffles in a canonical LD3/LD4
pattern, which are represented in LLVM as deinterleaving-shuffle(load). This
likely has less effect at the moment than the ST3/ST4 costs as instcombine will
perform certain transforms without considering the cost.



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