[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

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> That is due to uncprop pass which does the wrong thing here. Let me file
> that seperately.

Actually it is partly that and another issue which I file seperately too.