[all-commits] [llvm/llvm-project] 8fb748: [Inliner] Don't count a call penalty for foldable ...

[Marina Taylor via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8fb748b4a7c45b56c2e4f37c327fd88958ab3758
      https://github.com/llvm/llvm-project/commit/8fb748b4a7c45b56c2e4f37c327fd88958ab3758
  Author: Marina Taylor <marina_taylor at apple.com>
  Date:   2024-11-29 (Fri, 29 Nov 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/InlineCost.h
    M llvm/lib/Analysis/InlineCost.cpp
    A llvm/test/Transforms/Inline/AArch64/memcpy-constant-size.ll
    A llvm/test/Transforms/PhaseOrdering/AArch64/memcpy-constant-size.ll

  Log Message:
  -----------
  [Inliner] Don't count a call penalty for foldable __memcpy_chk and similar (#117876)

When the size is an appropriate constant, __memcpy_chk will turn into a
memcpy that gets folded away by InstCombine. Therefore this patch avoids
counting these as calls for purposes of inlining costs.

This is only really relevant on platforms whose headers redirect memcpy
to __memcpy_chk (such as Darwin). On platforms that use intrinsics,
memcpy and similar functions are already exempt from call penalties.



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