From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 873F03858421; Thu, 1 Jun 2023 10:54:01 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 873F03858421 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1685616841; bh=yQZZ51lhvwsM5VdPvw71z2UFMccP8u0PJmlx9+EZ3Uc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=Z/merYj4po9OPOsFM75ggLHXrv5CwakNuQakTtXEjrmMhdd2Au0jmVn58+ZLIuRi3 QWUr5A5kbhz0vldNILIEzO0SnuIxqS6e3tpedKZEWB/RZl4xZzGSWA0bQmh/8wMBam DV6c8DcZNwGHoS4shUr7I04mZtMcTzLakP9zQLXE= From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/109205] vector.resize( v.size() + 100 ) does unnecessary comparison Date: Thu, 01 Jun 2023 10:53:59 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Version: 12.2.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: redi 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: see_also 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=3D109205 Jonathan Wakely changed: What |Removed |Added ---------------------------------------------------------------------------- See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=3D110060 --- Comment #4 from Jonathan Wakely --- I added hints to size() and capacity() and it caused regressions, see PR 11= 0060 It makes it less likely for size() to be inlined, and causes: FAIL: g++.dg/pr104547.C -std=3Dgnu++14 scan-tree-dump-not vrp2 "_M_default_append"=