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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/97984] [10/11 Regression] Worse code for -O3 than -O2 on
 aarch64 vector multiply-add
Date: Wed, 08 Dec 2021 19:51:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97984

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #4)
> Hm, can't replicate for GCC 10, do you use any -mtune or so?

I can reproduce worse code for GCC 10 at -O3 -mtune=3Dgeneric:

        ldp     x2, x3, [x0]
        ldr     x4, [x1]
        ldr     q1, [x1]
        mul     x2, x2, x4
        ldr     x4, [x1, 8]
        fmov    d0, x2
        ins     v0.d[1], x3
        mul     x1, x3, x4
        ins     v0.d[1], x1
        add     v0.2d, v0.2d, v1.2d
        str     q0, [x0]

But with -O3 -mtune=3Dcortext-a57 the decent code happens.=