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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/95967] Poor aarch64 vector constructor code when using
 arm_neon.h
Date: Thu, 12 Aug 2021 07:37:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95967

Tamar Christina <tnfchris at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tnfchris at gcc dot gnu.org

--- Comment #6 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
f3 and g3 no longer use the stack:

f3:
        ins     v0.s[1], v1.s[0]
        sub     sp, sp, #16
        add     sp, sp, 16
        ins     v0.s[2], v2.s[0]
        ins     v0.s[3], v3.s[0]
        ret

g3:
        ldr     s0, [x0]
        sub     sp, sp, #16
        ld1     {v0.s}[1], [x1]
        ld1     {v0.s}[2], [x2]
        ld1     {v0.s}[3], [x3]
        add     sp, sp, 16
        ret

Though we still allocate the space for it (but that's a general AArch64 iss=
ue).
for the other cases the only thing left is the initializations.=