[Bug target/94541] [8/9/10 Regression] -mx32 gcc produces wrong code passing structs by value

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94541

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|middle-end                  |target

--- Comment #13 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #12)
> 
> But
> 
> (insn 13 12 14 3 (set (reg:SI 4 si)
>         (subreg:SI (reg/v:DI 4 si [orig:85 b ] [85]) 0)) "y.i":14:14 67
> {*movsi_internal}
>      (expr_list:REG_DEAD (reg/v:DI 4 si [orig:85 b ] [85])
>         (nil)))
> 
> isn't useless and shouldn't be removed.

It is useless because TARGET_TRULY_NOOP_TRUNCATION is true.  So the problem is
you don't have a zero_extend in the RTL in the first place where you needed it
to be.
THIS IS NOT A BUG in the middle-end.