From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-440641-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 27202 invoked by alias); 16 Jan 2014 22:08:40 -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 27177 invoked by uid 48); 16 Jan 2014 22:08:37 -0000
From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/59836] [4.7/4.8/4.9 Regression] Wrong outputs with rounding formats for some values.
Date: Thu, 16 Jan 2014 22:08:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libfortran
X-Bugzilla-Version: 4.9.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dominiq at lps dot ens.fr
X-Bugzilla-Status: NEW
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:
Message-ID: <bug-59836-4-pAYYOziSRB@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-59836-4@http.gcc.gnu.org/bugzilla/>
References: <bug-59836-4@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: 2014-01/txt/msg01783.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59836

--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> I will also test your patches and review and commit for you if you need. 
> Please let me know. 

Could you check in particular that I did not miss something when removing the
line

-      nzero--;

I have not followed in detail the use of nzero.

I don't have write access so I cannot do the commit, but I can do the packaging
and the submit if it helps (I have the FSF form signed). Feel free to use the
posted patches as you like.

> I knew you were close to the solution on this one. Great job!

Thanks! Actually I have tried

-  if (w > 0 && d == 0 && p == 0)
+  if (ft != FMT_F && nbefore == 0 && w > 0 && d == 0 && p == 0)

but gfortran.dg/round_3.f08 regressed and I did not catch the need for the
second part of the patch, hence the kludge in pr59774 comment 9.

I think the formats and values in comment 0, can be added to
gfortran.dg/round_3.f08
(as well as some tests for pr59774). I'ld like also to add some tests for RC
around 0.5.