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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94541] [8/9/10 Regression] -mx32 gcc produces wrong code
 passing structs by value
Date: Thu, 09 Apr 2020 22:32:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94541

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)
>=20
> But
>=20
> (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)))
>=20
> 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.=