From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8744 invoked by alias); 15 May 2013 18:53:45 -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 Received: (qmail 8713 invoked by uid 48); 15 May 2013 18:53:40 -0000 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug inline-asm/57299] Inline assembly memory dependencies produce spurious loads, register pressure, compilation failures Date: Wed, 15 May 2013 18:53:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: inline-asm X-Bugzilla-Version: 4.8.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-05/txt/msg01066.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57299 --- Comment #5 from Andrew Pinski --- (In reply to Chris Mihelich from comment #4) > Yes indeed, x is loaded from the stack into edi, and y is loaded from the > stack into esi, as the register variable declarations specified. That's two > registers. Where are the other two? Simple, "m"(*x) cannot use either edi or esi. Likewise for "m"(*y). You can change the *y to *q and *x to *p, it will work.