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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/115464] [14 Backport] ICE when building libaom on arm64
 (neon sve bridge usage with tbl/perm)
Date: Thu, 13 Jun 2024 17:24:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115464

--- Comment #10 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Thanks for the fix, but I don't think it's sufficient.

what I meant with the earlier comment was that the subregs are broken in
general, so not just the one generated by the undef fast path.

i.e.

#include <arm_neon.h>
#include <arm_sve.h>
#include <arm_neon_sve_bridge.h>

svuint16_t
convolve4_4_x (uint16x8x2_t permute_tbl, svuint16_t a)
{
    return svset_neonq_u16 (a, permute_tbl.val[1]);
}

seems to still ICE for me because it goes into the general expander which
produces the same subreg.=