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Fri, 1 Dec 2023 07:34:39 +0000 (UTC) Received: from tucnak.zalov.cz (unknown [10.39.195.157]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 44B5F40C6EBB; Fri, 1 Dec 2023 07:34:39 +0000 (UTC) Received: from tucnak.zalov.cz (localhost [127.0.0.1]) by tucnak.zalov.cz (8.17.1/8.17.1) with ESMTPS id 3B17YatU540163 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Fri, 1 Dec 2023 08:34:37 +0100 Received: (from jakub@localhost) by tucnak.zalov.cz (8.17.1/8.17.1/Submit) id 3B17YZgi540162; Fri, 1 Dec 2023 08:34:35 +0100 Date: Fri, 1 Dec 2023 08:34:35 +0100 From: Jakub Jelinek To: Richard Biener Cc: gcc-patches@gcc.gnu.org Subject: [PATCH] lower-bitint: Fix ICE on bitint-39.c Message-ID: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline X-Spam-Status: No, score=-3.4 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Jakub Jelinek Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784064094392443980 X-GMAIL-MSGID: 1784064094392443980 Hi! torture/bitint-39.c ICEs with -O1; the problem is that the finish_arith_overflow code in one spot replaces use_stmt with an assignment or cast, but if unlucky and m_gsi iterator is the same statement, when the code later tree clobber = build_clobber (TREE_TYPE (var), CLOBBER_EOL); g = gimple_build_assign (var, clobber); gsi_insert_after (&m_gsi, g, GSI_SAME_STMT); it will insert after iterator which contains already replaced statement and that causes the gimple chain corruption. Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk? 2023-12-01 Jakub Jelinek * gimple-lower-bitint.cc (bitint_large_huge::finish_arith_overflow): When replacing use_stmt which is gsi_stmt (m_gsi), update m_gsi to the new statement. Jakub --- gcc/gimple-lower-bitint.cc.jj 2023-11-30 10:57:40.095555940 +0100 +++ gcc/gimple-lower-bitint.cc 2023-11-30 12:46:34.715093396 +0100 @@ -3682,6 +3682,8 @@ bitint_large_huge::finish_arith_overflow else g = gimple_build_assign (lhs2, NOP_EXPR, ovf); gsi_replace (&gsi, g, true); + if (gsi_stmt (m_gsi) == use_stmt) + m_gsi = gsi_for_stmt (g); break; } }