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From: "linkw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94043] [9/10 Regression] ICE in
 superloop_at_depth, at cfgloop.c:78
Date: Thu, 26 Mar 2020 08:54:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94043

--- Comment #14 from Kewen Lin <linkw at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #13)

>=20
> +      /* Find all SSA NAMEs in stmts which is defined in current loop,
> create
> +        PHIs for them, and replace them with phi results accordingly.  */
> +      for (gsi =3D gsi_start (stmts); !gsi_end_p (gsi); gsi_next (&gsi))
> +       {
> +         gimple *stmt =3D gsi_stmt (gsi);
> +         update_stmt (stmt);
> +
> ...
>=20
> should not be necessary.  What's missing in your patch is that when the
> current code has computed vec_lhs it needs to create a LC PHI node for it
> _before_ computing the lane extraction and instead use vec_lhs' there.

OK, I was thinking the mask for LOOP_VINFO_FULLY_MASKED_P part is probably a
SSA name and can live out, as your comments, it looks impossible. Will upda=
te
it and send for review after testing. Thanks again!=