From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12865 invoked by alias); 28 Jun 2014 12:27:05 -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 12817 invoked by uid 48); 28 Jun 2014 12:27:01 -0000 From: "glisse at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/60770] disappearing clobbers Date: Sat, 28 Jun 2014 12:27:00 -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: diagnostic X-Bugzilla-Severity: normal 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: 2014-06/txt/msg02282.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60770 --- Comment #9 from Marc Glisse --- The warnings are "normal", they also appear in a non-patched build, so that leaves only the coalesce errors. (In reply to Eric Botcazou from comment #8) > The Ada front-end is the only serious user of abnormal call edges and the > like (for example SSA_NAME_OCCURS_IN_ABNORMAL_PHI) so this is not very > surprising. Indeed there are setjmp related things nearby in the dump and it is most likely related to this error. Though I am not sure what coalesce is unhappy about: Unable to coalesce ssa_names 3329 and 3388 which are marked as MUST COALESCE. r_3329(ab) and r_3388(D)(ab) That's likely: # r_3329(ab) = PHI but r_3388 only ever appears on the rhs of PHI nodes, always uninitialized, so it can essentially be ignored. Well, I'll keep looking when I can. (tools like delta have a hard time removing much more than the comments there, the size of the testcase (ali.adb) doesn't help)