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From: "ibuclaw at gdcproject dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug d/94609] FAIL: gdc.dg/runnable.d
Date: Wed, 15 Apr 2020 21:09:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94609

--- Comment #8 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
(In reply to H.J. Lu from comment #6)
> (In reply to Iain Buclaw from comment #5)
> > The struct is built as a POD type.  As the struct is nested, it should =
be
> > considered non-POD, otherwise it gets left up to aggregate_value_p to d=
ecide
> > how to pass it around.
> >=20
> > i386 returns true from aggregate_value_p because flag_pcc_struct_return=
=3D1.
> >=20
> > x86_64 returns true from aggregate_value_p because
> > targetm.calls.return_in_memory returns true.
> >=20
> > x32 returns false from aggregate_value_p because the halved size makes =
it
> > small enough to pass around in registers.
>=20
> Does x32 return it in a single 64-bit register?

Two 64-bit registers.  The size of struct Scoped is 32 bytes on x86_64, 16
bytes on x32.=