[all-commits] [llvm/llvm-project] 844c73: [HWASAN] Mark built-ins as not built-ins to preven...

[Kirill Stoimenov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 844c731f2dda3e01984f79b9e68d5d7566c9824c
      https://github.com/llvm/llvm-project/commit/844c731f2dda3e01984f79b9e68d5d7566c9824c
  Author: Kirill Stoimenov <87100199+kstoimenov at users.noreply.github.com>
  Date:   2023-10-13 (Fri, 13 Oct 2023)

  Changed paths:
    M compiler-rt/test/hwasan/TestCases/memcmp.cpp
    M llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
    A llvm/test/Instrumentation/HWAddressSanitizer/str-nobuiltin.ll

  Log Message:
  -----------
  [HWASAN] Mark built-ins as not built-ins to prevent optimizations (#68936)

The other 3 sanitizers (ASAN, TSAN and MSAN) all use
maybeMarkSanitizerLibraryCallNoBuiltin to make disable optimizations
which inline functions like memcmp for example. The lack of this
optimization was allowing ExpandMemCmpPass to convert a memcmp call to
inlined assembly and cause a false negative in HWASAN.