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* [Bug tree-optimization/85697] At -Os nontrivial ctor does not use SSE to zero
       [not found] <bug-85697-4@http.gcc.gnu.org/bugzilla/>
@ 2021-08-10 17:52 ` pinskia at gcc dot gnu.org
  0 siblings, 0 replies; only message in thread
From: pinskia at gcc dot gnu.org @ 2021-08-10 17:52 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85697

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2018-05-09 00:00:00         |2021-8-10
           Severity|normal                      |enhancement

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note the testcase needs a slight update to it:
__attribute__((noinline, noipa)) void UseA (A& a) { a.a=1; }

Note you need the noipa because GCC figures out that only writes to a.a and
later on only accesses a.a so it deletes the other writes :).

Turning SLP on at -O2/-Os would be something to look into.

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2021-08-10 17:52 ` [Bug tree-optimization/85697] At -Os nontrivial ctor does not use SSE to zero pinskia at gcc dot gnu.org

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