[Bug tree-optimization/98335] [9/10/11 Regression] Poor code generation for partial struct initialization

[ebotcazou at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98335

--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> We expand the first case from
> 
>   MEM <char[7]> [(struct Data *)&D.2365 + 1B] = {};
>   c.0_1 = c;
>   D.2365.a = c.0_1;
>   return D.2365;

But why generate a 7-byte zeroing instead of a 8-byte one?  I gather this is
the cause of the regression.