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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/94452] I386 ABI: How to determine the alignment
 arguments on the stack of struct or union for argument passing
Date: Thu, 02 Apr 2020 11:56:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94452

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to ChenLiu from comment #5)
> (In reply to Richard Biener from comment #4)
> > (In reply to ChenLiu from comment #2)
> > > (In reply to Richard Biener from comment #1)
> > > > I see gx aligned to 64 bytes (as I expected).  Can you be more spec=
ific as
> > > > to what target you tested?
> > >=20
> > > I tested on i386 target. I think you may misunderstand what I mean. T=
he gx
> > > will align to 4 byte when passing it on stack. I think this should be=
long to
> > > calling conventions.
> >=20
> > Ah, OK.  IIRC the psABI does not factor in over/under alignment but only
> > size and kind of (sub-)objects so eventually extra copy-in/out is requi=
red
> > to have the callee see arguments of the desired alignment.
> >=20
> > HJ can probably clarify.
> >=20
> > Note bugzilla isn't really for this kind of questions, there's a psABI
> > mailing list somewhere.
>=20
> Thanks for your help.

Please raise this question at

https://groups.google.com/forum/#!forum/ia32-abi=