From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1666) id 861093853828; Tue, 2 Aug 2022 06:35:30 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 861093853828 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="utf-8" From: Richard Biener To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-1924] tree-optimization/106495 - avoid threading to possibly never executed edge X-Act-Checkin: gcc X-Git-Author: Richard Biener X-Git-Refname: refs/heads/master X-Git-Oldrev: 325103829ef5996b66fff7ed77cc069c4394395b X-Git-Newrev: b9da686470d1c23929eefb401280ad8ba17e2a58 Message-Id: <20220802063530.861093853828@sourceware.org> Date: Tue, 2 Aug 2022 06:35:30 +0000 (GMT) X-BeenThere: gcc-cvs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Aug 2022 06:35:30 -0000 https://gcc.gnu.org/g:b9da686470d1c23929eefb401280ad8ba17e2a58 commit r13-1924-gb9da686470d1c23929eefb401280ad8ba17e2a58 Author: Richard Biener Date: Mon Aug 1 14:59:08 2022 +0200 tree-optimization/106495 - avoid threading to possibly never executed edge The following builds upon the logic of the PR105679 fix by avoiding to thread to a known edge that is predicted as probably never executed. PR tree-optimization/106495 * tree-ssa-threadbackward.cc (back_threader_profitability::profitable_path_p): If known_edge is probably never executed avoid threading. Diff: --- gcc/tree-ssa-threadbackward.cc | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/gcc/tree-ssa-threadbackward.cc b/gcc/tree-ssa-threadbackward.cc index 90f5331c265..0519f2a8c4b 100644 --- a/gcc/tree-ssa-threadbackward.cc +++ b/gcc/tree-ssa-threadbackward.cc @@ -777,6 +777,13 @@ back_threader_profitability::profitable_path_p (const vec &m_path, "exceeds PARAM_MAX_FSM_THREAD_PATH_INSNS.\n"); return false; } + if (taken_edge && probably_never_executed_edge_p (cfun, taken_edge)) + { + if (dump_file && (dump_flags & TDF_DETAILS)) + fprintf (dump_file, " FAIL: Jump-thread path not considered: " + "path leads to probably never executed edge.\n"); + return false; + } edge entry = find_edge (m_path[m_path.length () - 1], m_path[m_path.length () - 2]); if (probably_never_executed_edge_p (cfun, entry))