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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/104151] [9/10/11/12 Regression] x86: excessive code
 generated for 128-bit byteswap
Date: Mon, 31 Jan 2022 14:06:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104151

--- Comment #12 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
(In reply to Uro=C5=A1 Bizjak from comment #10)
> (In reply to Hongtao.liu from comment #4)
> > Also there's separate issue, codegen for below is not optimal
> > gimple:
> > _11 =3D VIEW_CONVERT_EXPR<vector(2) long unsigned int>(a_3(D))
> > asm:
> >         mov     QWORD PTR [rsp-24], rdi
> >         mov     QWORD PTR [rsp-16], rsi
> >         movdqa  xmm0, XMMWORD PTR [rsp-24]
> >=20
> >=20
> > I think this issue has been recorded in several existed PRs.
>=20
> Maybe this can be solved with secondary_reload when GPR and XMM regs are
> involved.

PR104306 is an experiment.=