From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id AB3373858D38; Sat, 13 May 2023 05:04:58 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AB3373858D38 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1683954298; bh=MMQZhblDDWDJr7n8WoADMh682tZcRrYsqlH1TTOV/Kc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=Wn2uPWkNLFPeBKZ0AQUVV9BZMIUWrtyewa+i8OdbyIB4OTJH0ipb1I+Kq7/gI7ZSk d9WJ7mP5xK/Mul2xF/tn5KFvfuKyy0L/Q1XEvBdmVpMliqqe0H6HliWGNl/flixwoO W9Y9vkJ7CqzzOTAOR5cYgr8sYh3j046BGWPpkULs= From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/94911] Failure to optimize comparisons of VLA sizes Date: Sat, 13 May 2023 05:04:58 +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: 10.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: pinskia at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: 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: cf_reconfirmed_on everconfirmed 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=3D94911 Andrew Pinski changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2023-05-13 Ever confirmed|0 |1 Status|UNCONFIRMED |NEW --- Comment #4 from Andrew Pinski --- # RANGE [irange] int [1, +INF] NONZERO 0x7fffffff intD.7 n_11(D) =3D nD.4385; sizetype _2; _BoolD.4372 _16; ;; basic block 2, loop depth 0, count 1073741824 (estimated locally), may= be hot ;; prev block 0, next block 1, flags: (NEW, REACHABLE, VISITED) ;; pred: ENTRY [always] count:1073741824 (estimated locally) (FALLTHRU,EXECUTABLE) # RANGE [irange] sizetype [1, 2147483647] NONZERO 0x7fffffff _1 =3D (sizetype) n_11(D); # RANGE [irange] sizetype [4, 8589934588] NONZERO 0x1fffffffc _2 =3D _1 * 4; _16 =3D _2 > 3; We have the information to do the folding in optimize but not earlier ...=