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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/105965] x86: single-element vectors don't have scalar FMA insns used anymore
Date: Tue, 14 Jun 2022 08:23:33 +0000	[thread overview]
Message-ID: <bug-105965-4-78uLdEIx6i@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-105965-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105965

Hongtao.liu <crazylht at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |crazylht at gmail dot com

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
It looks like a regression since GCC9

typedef float v1sf __attribute__((vector_size(4)));

v1sf
foo43 (v1sf a, v1sf b, v1sf c)
{
    return a * b + c;
}

gcc9 also don't generate vfmaddXXXss.

        pushq   %rbp
        movq    %rdi, %rax
        movq    %rsp, %rbp
        andq    $-32, %rsp
        vmovss  24(%rbp), %xmm0
        vmulss  16(%rbp), %xmm0, %xmm0
        vaddss  32(%rbp), %xmm0, %xmm0
        vmovss  %xmm0, -64(%rsp)
        movl    -64(%rsp), %edx
        movl    %edx, (%rdi)
        leave
        ret

  reply	other threads:[~2022-06-14  8:23 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-14  6:31 [Bug target/105965] New: " jbeulich at suse dot com
2022-06-14  8:23 ` crazylht at gmail dot com [this message]
2022-06-14  8:40 ` [Bug target/105965] [10/11/12/13 Regression] " rguenth at gcc dot gnu.org
2022-06-14 10:53 ` cvs-commit at gcc dot gnu.org
2022-06-14 10:53 ` [Bug target/105965] [10/11/12 " rguenth at gcc dot gnu.org
2022-06-21  1:52 ` [Bug tree-optimization/105965] " pinskia at gcc dot gnu.org
2022-06-21  6:59 ` rguenther at suse dot de
2022-06-28 10:49 ` jakub at gcc dot gnu.org
2022-07-19 11:38 ` cvs-commit at gcc dot gnu.org
2022-07-19 11:39 ` [Bug tree-optimization/105965] [10/11 " rguenth at gcc dot gnu.org
2023-07-07 10:43 ` [Bug tree-optimization/105965] [11 " rguenth at gcc dot gnu.org

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