From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14275 invoked by alias); 7 Jun 2012 14:59:05 -0000 Received: (qmail 14222 invoked by uid 22791); 7 Jun 2012 14:59:04 -0000 X-SWARE-Spam-Status: No, hits=-4.3 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,KHOP_THREADED X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 07 Jun 2012 14:58:52 +0000 From: "tkoenig at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug fortran/48543] Collapse identical strings Date: Thu, 07 Jun 2012 14:59:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: fortran X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: tkoenig 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-Changed-Fields: Message-ID: In-Reply-To: References: 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: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2012-06/txt/msg00409.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48543 --- Comment #2 from Thomas Koenig 2012-06-07 14:58:38 UTC --- I'll do a bit of work on that, because it can also be useful for reducing memcpy/memset pairs. Consider character(len=3) :: a character(len=4) :: b a = 'a' b = 'a' This could be changed into (in a first pass) a = 'a ' b = 'a ' for a simple assignment, but this would mean duplicate strings. Better to change this into a = 'a ' b = 'a '