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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107563] __builtin_shufflevector fails to pshufd instructions under default x86_64 compilation toggle which is the sse2 one
Date: Tue, 08 Nov 2022 08:28:44 +0000 [thread overview]
Message-ID: <bug-107563-4-Ymq00dfcyh@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-107563-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107563
--- Comment #10 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to cqwrteur from comment #9)
> (In reply to cqwrteur from comment #8)
> > for sse2 to do the __builtin_convertvector job yeah
>
> https://godbolt.org/z/dsf3WK58E
>
> using temp_vec_type [[__gnu__::__vector_size__ (16)]] = char;
> void foo4(temp_vec_type& v) noexcept
> {
> v=__builtin_shufflevector(v,v,1,0,3,2,5,4,7,6,9,8,11,10,13,12,15,14);
> }
>
> This is even more interesting.
>
> foo4(char __vector(16)&): # @foo4(char __vector(16)&)
> movdqa (%rdi), %xmm0
> movdqa %xmm0, %xmm1
> psrlw $8, %xmm1
> psllw $8, %xmm0
> por %xmm1, %xmm0
> movdqa %xmm0, (%rdi)
> retq
>
> clang generates this. by using ror and or
This is interesting case, similar for psrld/psrlq + pslld/psllq + or.
next prev parent reply other threads:[~2022-11-08 8:28 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-07 22:56 [Bug rtl-optimization/107563] New: __builtin_shufflevector fails to use pshufb and " unlvsur at live dot com
2022-11-07 23:00 ` [Bug target/107563] " unlvsur at live dot com
2022-11-07 23:05 ` [Bug target/107563] __builtin_shufflevector fails to " unlvsur at live dot com
2022-11-08 0:11 ` unlvsur at live dot com
2022-11-08 0:11 ` unlvsur at live dot com
2022-11-08 3:23 ` crazylht at gmail dot com
2022-11-08 3:33 ` crazylht at gmail dot com
2022-11-08 6:11 ` unlvsur at live dot com
2022-11-08 6:11 ` unlvsur at live dot com
2022-11-08 6:14 ` unlvsur at live dot com
2022-11-08 8:28 ` crazylht at gmail dot com [this message]
2024-05-15 4:47 ` cvs-commit at gcc dot gnu.org
2024-05-18 15:17 ` admin at levyhsu dot com
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