[Bug tree-optimization/122533] x86 with -O2 --- uses mov+and instead of test, moves register back and forth, might omit memcpy()

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122533

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |tree-optimization
             Blocks|                            |121364

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There are also other bug reports about the removal of the memcpy (see PR 121364
for a list of some of them).

as for this:
>Observe that the first two instructions at L3 could be combined into a single test instruction.

That is due to uncprop pass which does the wrong thing here. Let me file that
seperately.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121364
[Bug 121364] [meta-bug] copy prop for aggregates