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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113734] [14 regression] libarchive miscompiled
 (fails libarchive_test_read_format_rar5_extra_field_version test) since
 r14-8768-g85094e2aa6dba7
Date: Wed, 07 Feb 2024 09:10:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113734

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Tamar Christina from comment #6)
> The reason for the miscompile popping up is this change from the previous
> patch
>=20
> diff --git a/gcc/tree-vect-data-refs.cc b/gcc/tree-vect-data-refs.cc
> index 109d4ce5192..df3eab2e8d5 100644
> --- a/gcc/tree-vect-data-refs.cc
> +++ b/gcc/tree-vect-data-refs.cc
> @@ -725,8 +725,7 @@ vect_analyze_early_break_dependences (loop_vec_info
> loop_vinfo)
>              bounded by VF so accesses are within range.  We only need to
> check the
>              reads since writes are moved to a safe place where if we get
> there we
>              know they are safe to perform.  */
> -         if (DR_IS_READ (dr_ref)
> -             && !ref_within_array_bound (stmt, DR_REF (dr_ref)))
> +         if (!ref_within_array_bound (stmt, DR_REF (dr_ref)))

I think it can even be relaxed to

         if ((DR_IS_READ (dr_ref) && check_deps))

since for non-peeled the IV exit block will be only executed with a fully
enabled vector.=