From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-477535-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 27395 invoked by alias); 17 Feb 2015 09:14:31 -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 27365 invoked by uid 48); 17 Feb 2015 09:14:28 -0000
From: "m.zakirov at samsung dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65088] New: Does GCC has load/store widening phase?
Date: Tue, 17 Feb 2015 09:14:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 5.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: m.zakirov at samsung dot com
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
Message-ID: <bug-65088-4@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/msg01868.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65088

            Bug ID: 65088
           Summary: Does GCC has load/store widening phase?
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: m.zakirov at samsung dot com

This example says me that it doesn't.

$ cat t2.c

int a[2];
int b[2];

int main ()
{
  b[0] = a[0];
  b[1] = a[1];
  return 0;
}

$ gcc t2.c -O3 -S

$ cat t2.s

...

main:
.LFB0:
    .cfi_startproc
    movl    a(%rip), %eax
    movl    %eax, b(%rip)
    movl    a+4(%rip), %eax
    movl    %eax, b+4(%rip)
    xorl    %eax, %eax
    ret
    .cfi_endproc

gcc version is:

commit 71464ecd3a554b889c3bbc53d8874fc532bdf953
Author: trippels <trippels@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Mon Jan 12 07:53:10 2015 +0000