https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81148

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
w/o ubsan we fold this all the way to one.  With ubsan we fold it as

  bool a = -((long int) ~(x != 0) ^ 9223372036854775806) + -124 != 0;

so there's some stupid TYPE_OVERFLOW_SANITIZED check in the way somewhere.

It looks association related again, I will have a look.

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