[Bug middle-end/91195] [10 regression] incorrect may be used uninitialized smw (272711, 273474]

[jiangning.liu at amperecomputing dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91195

Jiangning Liu <jiangning.liu at amperecomputing dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |msebor at gcc dot gnu.org

--- Comment #8 from Jiangning Liu <jiangning.liu at amperecomputing dot com> ---
Martin is arguing setting the no-warning bit in middle-end for this scenario is
not a robust solution at
https://gcc.gnu.org/ml/gcc-patches/2019-07/msg01525.html.

What about moving the case below to -O3? Could it be acceptable by
-Wmaybe-uninitialized tests?

tree base = get_base_address (lhs);
if (!nontrap->contains (lhs)
    && auto_var_p (base)
    && TREE_ADDRESSABLE (base)
    && optimization_level > 2)
  {
    /* Do conditional store replacement by inserting a load. */
  }