From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 11551 invoked by alias); 29 Aug 2014 18:13:57 -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 11507 invoked by uid 48); 29 Aug 2014 18:13:51 -0000 From: "krebbel at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug bootstrap/61078] [5 Regression] ESA mode bootstrap failure since r209897 Date: Fri, 29 Aug 2014 18:13:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: bootstrap X-Bugzilla-Version: 5.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: krebbel at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 5.0 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: 2014-08/txt/msg02015.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61078 --- Comment #7 from Andreas Krebbel --- (In reply to jgreenhalgh from comment #6) > As mentioned in the original patch submission [1], the effect is to allow > removal the removal of temporary registers when shuffling arguments for a > call. Ok. In fact it is exactly the removal of a temporary reg which revealed the back-end bug. The overlapping live ranges so far protected us from running into this particular problem. > If S/390 passes small numbers of arguments in registers, I'd expect the net > result to be positive for performance. I agree. S/390 should be able to benefit from that so forget about reverting your patch :) I'll find a way to fix the patterns in question. Thanks for the explanation!