From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 1A9DE3858D1E; Fri, 10 Nov 2023 08:25:00 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1A9DE3858D1E
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1699604700;
	bh=hgUaB12U0d5gtg/WWHEQt+YxCgEWKS3bgFalEcCvB7o=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=BxorlFBy145Ko35WhDnYXcOszA5d9zvCpLye6uUcoYE5e6nzXwvkRIIK5rLPf5fw0
	 xGst7p8HUx5IAVmBk7Ems8/H625/Ok/qjbHoeTGPh9D4nwsLcvJ3KTcjVAoEf/UMkb
	 wuDNDM6zTQsu7La32uVRRtVNxHWjGGeoBelO2C88=
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112464] [14 Regression] ICE avx512 with
 -ftrapv since r14-5076
Date: Fri, 10 Nov 2023 08:24:58 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 14.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_status cf_reconfirmed_on everconfirmed
Message-ID: <bug-112464-4-P3mxFzN3ta@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-112464-4@http.gcc.gnu.org/bugzilla/>
References: <bug-112464-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112464

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-11-10
     Ever confirmed|0                           |1

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Robin Dapp from comment #2)
> I tested
>=20
> diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
> index a544bc9b059..257fd40793e 100644
> --- a/gcc/tree-vect-loop.cc
> +++ b/gcc/tree-vect-loop.cc
> @@ -7084,7 +7084,7 @@ vectorize_fold_left_reduction (loop_vec_info
> loop_vinfo,
>                                          opmask, &vec_opmask);
>      }
>=20=20
> -  gimple *sdef =3D scalar_dest_def_info->stmt;
> +  gimple *sdef =3D vect_orig_stmt (scalar_dest_def_info)->stmt;
>=20
> overnight on x86 and aarch64.  This seems to help for the reduced testcas=
e.
>=20
> It appears as if we "look through" a statement pattern in
> vect_finish_replace_stmt but not before when we replace the newly created
> vector statement's lhs.  Then the lhs is the statement pattern's lhs while
> in vect_finish_replace_stmt we assert that it's from the statement the
> pattern replaced.

Hmm, that will only work if the orig stmt is the root of the pattern
sequence.  But otherwise it looks correct to me.=