From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28919 invoked by alias); 4 Mar 2011 15:35:47 -0000 Received: (qmail 28850 invoked by uid 22791); 4 Mar 2011 15:35:44 -0000 X-SWARE-Spam-Status: No, hits=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 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; Fri, 04 Mar 2011 15:35:40 +0000 From: "joseph at codesourcery dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/47977] powerpc (-mcpu=8548) Wrong code for double operations in little endian mode X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: joseph at codesourcery 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: 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 Date: Fri, 04 Mar 2011 15:35:00 -0000 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: 2011-03/txt/msg00413.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47977 --- Comment #4 from joseph at codesourcery dot com 2011-03-04 15:35:20 UTC --- On Fri, 4 Mar 2011, m.lazzarotto at robox dot it wrote: > My target is effectively an e500v2. > I also tried to pass -mabi=spe, with no difference in the output. > Is using --enable-e500-double compile-time equivalent to use -mdouble-float > runtime? It is roughly equivalent to -mfloat-gprs=double - but it may not work sensibly except for the e500-specific targets such as powerpc-eabispe. And this is only useful with -mabi=spe. e500v2 should follow the soft-float ABI (in particular, double arguments are passed in two GPRs, not one; the only time all 64 bits of a GPR are used for argument passing or return is for SPE vectors). Because of the error-prone nature of passing all the required options manually, I advise configuring for powerpc-eabispe.