From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-406232-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 27079 invoked by alias); 10 Nov 2012 04:13:54 -0000
Received: (qmail 23540 invoked by uid 48); 10 Nov 2012 04:13:33 -0000
From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/55259] plus_constant doesn't handle zero-extended address properly
Date: Sat, 10 Nov 2012 04:13:00 -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-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: hjl.tools at gmail 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-Changed-Fields:
Message-ID: <bug-55259-4-5v7OfQbXMP@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-55259-4@http.gcc.gnu.org/bugzilla/>
References: <bug-55259-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
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
X-SW-Source: 2012-11/txt/msg00894.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55259

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2012-11-10 04:13:32 UTC ---
A potential fix:

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 95bbfa7..d7c454c 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -2109,6 +2109,12 @@ adjust_address_1 (rtx memref, enum machine_mode mode,
HOS
T_WIDE_INT offset,
     addr = gen_rtx_LO_SUM (address_mode, XEXP (addr, 0),
                    plus_constant (address_mode,
                           XEXP (addr, 1), offset));
+      else if (GET_CODE (addr) == ZERO_EXTEND)
+    {
+      addr = XEXP (addr, 0);
+      addr = plus_constant (GET_MODE (addr), addr, offset);
+      addr = gen_rtx_ZERO_EXTEND (address_mode, addr);
+    }
       else
     addr = plus_constant (address_mode, addr, offset);
     }