From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 38802 invoked by alias); 6 Mar 2015 12:53:00 -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 Received: (qmail 38758 invoked by uid 48); 6 Mar 2015 12:52:57 -0000 From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/64928] [4.8/4.9/5 Regression] Inordinate cpu time and memory usage in "phase opt and generate" with -ftest-coverage -fprofile-arcs Date: Fri, 06 Mar 2015 12:53:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Version: 4.9.2 X-Bugzilla-Keywords: compile-time-hog, memory-hog X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.8.5 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: attachments.created 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: 2015-03/txt/msg00704.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64928 --- Comment #17 from Richard Biener --- Created attachment 34975 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34975&action=edit do not compute live/conflict for abnormal coalesces This is the other idea of simply not computing live/conflict for abnormal coalesces we know to always succeed. This shrinks the following live/conflict problem for the regular coalesces by unifying some partitions. Doesn't help this particular testcase much.