[all-commits] [llvm/llvm-project] ddf572: [nsan] Emit calls to optimized functions (#98900)

[Dmitry Chestnykh via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ddf5725ef180692b60962ae56e352a7af6fc5919
      https://github.com/llvm/llvm-project/commit/ddf5725ef180692b60962ae56e352a7af6fc5919
  Author: Dmitry Chestnykh <dm.chestnykh at gmail.com>
  Date:   2024-07-24 (Wed, 24 Jul 2024)

  Changed paths:
    M compiler-rt/lib/nsan/nsan.cpp
    M llvm/lib/Transforms/Instrumentation/NumericalStabilitySanitizer.cpp
    M llvm/test/Instrumentation/NumericalStabilitySanitizer/memory.ll

  Log Message:
  -----------
  [nsan] Emit calls to optimized functions (#98900)

As previously noted in nsan.cpp we can implement
optimized variants of `__nsan_copy_values` and
`__nsan_set_value_unknown` if a memory operation
size is known.
Now the instrumentation creates calls to optimized functions if there is
4, 8 or 16-byte memory operation like
`memset(X, value, 4/8/16)` or `memcpy(dst, src, 4/8/16)`
nsan.cpp provides definitions of the optimized functions.



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