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 874B23858D39; Thu,  3 Mar 2022 12:56:46 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 874B23858D39
From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/104771] New: '-fcompare-debug' failure w/ -mno-vsx -O1
 -frename-registers
Date: Thu, 03 Mar 2022 12:56:46 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: debug
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: compare-debug-failure
X-Bugzilla-Severity: normal
X-Bugzilla-Who: asolokha at gmx dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
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
 keywords bug_severity priority component assigned_to reporter
 target_milestone cf_gcctarget attachments.created
Message-ID: <bug-104771-4@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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Thu, 03 Mar 2022 12:56:46 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104771

            Bug ID: 104771
           Summary: '-fcompare-debug' failure w/ -mno-vsx -O1
                    -frename-registers
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: compare-debug-failure
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: powerpc-e300c3-linux-gnu

Created attachment 52556
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52556&action=3Dedit
gdk diff

g++ 12.0.1 20220227 snapshot (g:d1574a9b820f17adb9004255e2018967e9be063b) f=
ails
-fcompare-debug check when compiling the following testcase w/ -mno-vsx -O1
-frename-registers:

int n;

void
quux ();

template <typename>
void
bar (long double y)
{
  for (int i =3D 0; i < n; ++i)
    {
      double uninit, a;

      for (int j =3D 0; j < n; ++j)
        {
        }

      a =3D uninit / y + n;
      if (a !=3D 0.0)
        quux ();
    }
}

void
foo (long double x)
{
  bar<short int> (x);
  bar<int> (x);
}

% powerpc-e300c3-linux-gnu-g++-12.0.1 -mno-vsx -O1 -fcompare-debug
-frename-registers -c vrsxlrxu.cpp
powerpc-e300c3-linux-gnu-g++-12.0.1: error: vrsxlrxu.cpp: '-fcompare-debug'
failure

-fno-rename-registers or -mvsx "fixes" it.

gdk diff attached.=