[Bug middle-end/86763] [7/8/9 Regression] Wrong code comparing member of copy of a 237 byte object with nontrivial default constructor on x86-64 arch

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86763

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |6.4.0
            Summary|[8/9 Regression] Wrong code |[7/8/9 Regression] Wrong
                   |comparing member of copy of |code comparing member of
                   |a 237 byte object with      |copy of a 237 byte object
                   |nontrivial default          |with nontrivial default
                   |constructor on x86-64 arch  |constructor on x86-64 arch
      Known to fail|                            |7.1.0

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Also fails with GCC 7 (not with -O2 but with -O -fstrict-aliasing
-fschedule-insns2), same reason.