[Bug middle-end/104151] [9/10/11/12 Regression] x86: excessive code generated for 128-bit byteswap

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104151

--- Comment #10 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Hongtao.liu from comment #4)
> Also there's separate issue, codegen for below is not optimal
> gimple:
> _11 = 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]
> 
> 
> I think this issue has been recorded in several existed PRs.

Maybe this can be solved with secondary_reload when GPR and XMM regs are
involved.