From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 2A37A3857802; Thu, 21 Oct 2021 23:21:39 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2A37A3857802 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug bootstrap/102681] [12 Regression] AArch64 bootstrap failure Date: Thu, 21 Oct 2021 23:21:39 +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: 12.0 X-Bugzilla-Keywords: build, diagnostic X-Bugzilla-Severity: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.0 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: attachments.isobsolete attachments.created Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Oct 2021 23:21:40 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102681 Andrew Pinski changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #51649|0 |1 is obsolete| | --- Comment #14 from Andrew Pinski --- Created attachment 51650 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51650&action=3Dedit Little more reduced So FRE is able to figure out for the following: # _20 =3D PHI <0(2), 1(3)> # const_upper_26 =3D PHI .... # _30 =3D PHI <0(12), 1(13)> # const_upper_33 =3D PHI That _30 is the same as _20 but not _26 is the same as _33 even though it d= oes figure out that _19 and _29 are the same as _10. If it is able to figure th= at out, then things would just work. Richi, I assume FRE does not Value number default SSA names (non-parm) the same which is why this is happening is that correct?=