From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 15713 invoked by alias); 6 Apr 2010 19:23:30 -0000 Received: (qmail 15700 invoked by uid 22791); 6 Apr 2010 19:23:29 -0000 X-SWARE-Spam-Status: No, hits=-1.9 required=5.0 tests=BAYES_00,SPF_FAIL X-Spam-Check-By: sourceware.org Received: from mx20.gnu.org (HELO mx20.gnu.org) (199.232.41.8) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 06 Apr 2010 19:23:25 +0000 Received: from mail.codesourcery.com ([38.113.113.100]) by mx20.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1NzEMs-0001wu-Sq for gcc@gcc.gnu.org; Tue, 06 Apr 2010 15:23:23 -0400 Received: (qmail 5499 invoked from network); 6 Apr 2010 19:23:20 -0000 Received: from unknown (HELO digraph.polyomino.org.uk) (joseph@127.0.0.2) by mail.codesourcery.com with ESMTPA; 6 Apr 2010 19:23:20 -0000 Received: from jsm28 (helo=localhost) by digraph.polyomino.org.uk with local-esmtp (Exim 4.69) (envelope-from ) id 1NzEMp-0007HI-Ch; Tue, 06 Apr 2010 19:23:19 +0000 Date: Tue, 06 Apr 2010 19:23:00 -0000 From: "Joseph S. Myers" To: Ian Lance Taylor cc: Nathan Froyd , roy rosen , gcc@gcc.gnu.org Subject: Re: lower subreg optimization In-Reply-To: Message-ID: References: <20100406171245.GK540@codesourcery.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-detected-operating-system: by mx20.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) Mailing-List: contact gcc-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-owner@gcc.gnu.org X-SW-Source: 2010-04/txt/msg00100.txt.bz2 On Tue, 6 Apr 2010, Ian Lance Taylor wrote: > This code is sort of weird, though; why the conversion from DImode to > DFmode? See for discussion of the e500 subregs and their semantics. I made them work reliably (for 4.3 and later, 4.4 and later when decimal floating-point modes are involved) - but not necessarily efficiently in all cases. -- Joseph S. Myers joseph@codesourcery.com