From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27633 invoked by alias); 15 Feb 2014 00:52:39 -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 27590 invoked by uid 55); 15 Feb 2014 00:52:36 -0000 From: "joseph at codesourcery dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/60206] IVOPT has no idea of inline asm Date: Sat, 15 Feb 2014 00:52:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 4.9.0 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-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: 2014-02/txt/msg01377.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60206 --- Comment #3 from joseph at codesourcery dot com --- On Fri, 14 Feb 2014, pinskia at gcc dot gnu.org wrote: > I think the real issue __FP_FRAC_SUB_4 needs to be fixed not to use inline-asm > but normal C code. The normal C code should be able to produce as good as the > inline-asm code now too. Does GCC do a good job of detecting add-with-carry and subtract-with-borrow patterns (i.e. detecting the comparison that corresponds to the carry flag and its use in a subsequent operation)? (The Clang __builtin_addc* / __builtin_subc* functions might also be a useful addition for this sort of purpose.)