http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43808

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-11-08 
15:38:21 UTC ---
Ah,
  if (optimize)
    update_alias_info_with_stack_vars ();
explains that.  Guess it should be if (optimize || ...).
if (optimize || flag_strict_aliasing) would work for this testcase, but not
sure
if things still wouldn't break for -O0 -fschedule-insns or similar.

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