From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27686 invoked by alias); 30 Dec 2013 18:17:12 -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 27651 invoked by uid 48); 30 Dec 2013 18:17:07 -0000 From: "glisse at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/59615] "asm goto" output or at least clobbered operands Date: Mon, 30 Dec 2013 18:17:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Version: unknown X-Bugzilla-Keywords: X-Bugzilla-Severity: enhancement X-Bugzilla-Who: glisse 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: 2013-12/txt/msg02422.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59615 --- Comment #8 from Marc Glisse --- (In reply to Jakub Jelinek from comment #7) > They are modelled in the .md files now, we just don't have general purpose > builtins for this yet in GCC 4.9, it is only used for -fsanitize=undefined > right now. Ah, right, I thought you had only added an expander, nice that it is properly modeled now (thanks), though I am yet to find C code where combine (or other) ends up matching this pattern, which seems doable without a builtin. (well, we are still losing the high half of the product if we use that pattern, but that's less often needed) Sorry for the hijack, back to comment 5 as the real motivation.