From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-198961-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 12714 invoked by alias); 6 Oct 2006 19:07:54 -0000
Received: (qmail 12690 invoked by uid 48); 6 Oct 2006 19:07:45 -0000
Date: Fri, 06 Oct 2006 19:07:00 -0000
Message-ID: <20061006190745.12689.qmail@sourceware.org>
X-Bugzilla-Reason: CC
References: <bug-29294-9933@http.gcc.gnu.org/bugzilla/>
Subject: [Bug rtl-optimization/29294] 4.1, 4.2 (possibly 4.0?) not finding postmodify address mode on ARM
In-Reply-To: <bug-29294-9933@http.gcc.gnu.org/bugzilla/>
Reply-To: gcc-bugzilla@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org
From: "eplondke at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
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: 2006-10/txt/msg00522.txt.bz2
List-Id: <gcc-bugs.sourceware.org>



------- Comment #6 from eplondke at gmail dot com  2006-10-06 19:07 -------
Changing the cost of (REG) to 1 fixes 4.1 but not 4.2, it seems.

In 4.2, the RTL optimization does not combine 

        ldr     r2, [r1, #0]
        ldr     r3, [r0, #0]
        add     r0, r0, #4
        add     r1, r1, #4

into

        ldr     r2, [r1], #4
        ldr     r3, [r0], #4


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29294