From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id B3760385841A; Wed, 7 Sep 2022 08:44:26 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B3760385841A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1662540266; bh=Xq2RtbpaFV33ZF+fL3u5U2m0b2C8iyf26haKTu3/0bs=; h=From:To:Subject:Date:In-Reply-To:References:From; b=JRIunev5w8LGLFNQfidAWKIXnK0gwO5DBQhaijVHp2w5bLSiwyytWSfyJSYjONCoO K+cHLV6U8vTgAcI8hdPdb9VryW8cyFJBBT8C+PxeWy3l8+ubi6CKDdaM9PoWWrl6lV kkkJuKGgsN5h3py0fqRqVDPpO3jKpcnFiFsTLFkk= From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/106860] [12/13 Regression] ICE in single_pred_edge, at basic-block.h:347 Date: Wed, 07 Sep 2022 08:44:26 +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: 13.0 X-Bugzilla-Keywords: ice-on-valid-code X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: rguenth at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.3 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: assigned_to everconfirmed cf_reconfirmed_on target_milestone bug_status 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106860 Richard Biener changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot = gnu.org Ever confirmed|0 |1 Last reconfirmed| |2022-09-07 Target Milestone|--- |12.3 Status|UNCONFIRMED |ASSIGNED --- Comment #1 from Richard Biener --- Confirmed. static bool split_loop (class loop *loop1) { ... /* Fix first loop's exit probability after scaling. */ edge exit_to_latch1 =3D single_pred_edge (loop1->latch); I think it's a misconception that latches are guaranteed to have a single predecessor. With LOOPS_HAVE_SIMPLE_LATCHES we have a single _successor_. The CFG is also very different than expected, with a lot of code on the "latch" (a whole subloop is there).=