From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-423667-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 9961 invoked by alias); 2 Jun 2013 09:02:52 -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 9939 invoked by uid 48); 2 Jun 2013 09:02:48 -0000
From: "gjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/57503] [4.7/4.8 Regression] Expand uses wrong multiply routine
Date: Sun, 02 Jun 2013 09:02:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 4.7.2
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: gjl at gcc dot gnu.org
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-57503-4-dHdoeqAIf5@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-57503-4@http.gcc.gnu.org/bugzilla/>
References: <bug-57503-4@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: 2013-06/txt/msg00046.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57503

--- Comment #2 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
(In reply to Georg-Johann Lay from comment #1)
> Created attachment 30242 [details]
> .expand dump
> 
> Notice that in rot(), long D.1484_5 is unused and instead the 32-bit value
> D.1482_3 is used.

16-bit, of course.  In the s-file you can see that __usmulhisi3 is used.  This
is a widening 16-bit unsigned * 16-bit signed multiplication and not correct
here.