From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-477254-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 16408 invoked by alias); 14 Feb 2015 09:22:26 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 16373 invoked by uid 48); 14 Feb 2015 09:22:23 -0000
From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/65063] New: gcc.dg/vect/vect-double-reduc-6.c FAILs with -O3 -fno-tree-loop-ivcanon -fno-tree-vectorize
Date: Sat, 14 Feb 2015 09:22:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 5.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: zsojka at seznam dot cz
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter attachments.created
Message-ID: <bug-65063-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2015-02/txt/msg01587.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65063

            Bug ID: 65063
           Summary: gcc.dg/vect/vect-double-reduc-6.c FAILs with -O3
                    -fno-tree-loop-ivcanon -fno-tree-vectorize
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz

Created attachment 34754
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34754&action=edit
reduced testcase

Output (on reduced testcase):
$ gcc -Wall -W testcase.c -O3 -fno-tree-loop-ivcanon -fno-tree-vectorize
$ ./a.out 
Aborted

The assembly code shows:
...
    mov    DWORD PTR out[rip], 0    # out,
    mov    DWORD PTR out[rip+4], 16    # out,
    mov    DWORD PTR out[rip+8], 256    # out,
    mov    DWORD PTR out[rip+12], 16384    # out,
    call    abort    #

out[] = {0, 16, 256, 16384}
but should be
out[] = {0, 16, 256, 4096}

(gdb) p in
$1 = {{0, 0, 0, 0}, {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}, {2, 2, 2, 2}, {2,
2, 2, 2}, {2, 2, 2, 2}, {3, 3, 3, 3}}
(gdb) p out
$2 = {0, 16, 256, 16384}

in[] looks fine, also in the assembly

The first dump where "16384" appears is 191r.cse1. This might be the same as
PR63593.

Tested revisions:
r220676 - fail