[all-commits] [llvm/llvm-project] af0221: [llvm][IR] Treat memcmp and bcmp as libcalls

[Paul Kirth via All-commits]

  Branch: refs/heads/users/ilovepi/bcmp-libcall
  Home:   https://github.com/llvm/llvm-project
  Commit: af02216b9358166b635335491934ff44cdcc89a5
      https://github.com/llvm/llvm-project/commit/af02216b9358166b635335491934ff44cdcc89a5
  Author: Paul Kirth <paulkirth at google.com>
  Date:   2025-04-14 (Mon, 14 Apr 2025)

  Changed paths:
    M llvm/include/llvm/IR/RuntimeLibcalls.def
    M llvm/test/LTO/Resolution/RISCV/bcmp-libcall.ll

  Log Message:
  -----------
  [llvm][IR] Treat memcmp and bcmp as libcalls

Since the backend may emit calls to these functions, they should be
treated like other libcalls. If we don't, then it is possible to
have their definitions removed during LTO because they are dead, only to
have a later transform introduce calls to them.

See https://discourse.llvm.org/t/rfc-addressing-deficiencies-in-llvm-s-lto-implementation/84999
for more information.



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