From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18018 invoked by alias); 2 Jan 2011 20:53:34 -0000 Received: (qmail 18009 invoked by uid 22791); 2 Jan 2011 20:53:34 -0000 X-SWARE-Spam-Status: No, hits=-2.9 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; Sun, 02 Jan 2011 20:53:30 +0000 From: "hjl.tools at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/46942] x86_64 parameter passing unnecessary sign/zero extends 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: hjl.tools at gmail dot com X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.6.0 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: Sun, 02 Jan 2011 20:53:00 -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: 2011-01/txt/msg00094.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46942 --- Comment #6 from H.J. Lu 2011-01-02 20:53:12 UTC --- (In reply to comment #5) > And upper 32 bits are undefined if the argument is 8/16/32 bit (i.e. callee > must sign/zero extend, instead of caller)? If callee wants 64bit, it has to sign/zero extend it to 64bit.