https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277236

--- Comment #4 from John F. Carr <j...@mit.edu> ---
Here is an example:

struct S {
  long alignment;
  int this_lowbit();
};
int S::this_lowbit() { return reinterpret_cast<signed long>(this) & 1; }

The method this_lowbit always returns zero with optimization enabled.

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