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Tue, 6 Feb 2024 20:43:00 +0000 (UTC) Received: from tucnak.zalov.cz (unknown [10.39.192.70]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E66AA1C060AF; Tue, 6 Feb 2024 20:42:58 +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 416KguKb1961326 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Tue, 6 Feb 2024 21:42:57 +0100 Received: (from jakub@localhost) by tucnak.zalov.cz (8.17.1/8.17.1/Submit) id 416Kgu8H1961325; Tue, 6 Feb 2024 21:42:56 +0100 Date: Tue, 6 Feb 2024 21:42:55 +0100 From: Jakub Jelinek To: Aldy Hernandez , Andrew MacLeod Cc: gcc-patches@gcc.gnu.org Subject: [PATCH] range-op: Fix up ABSU_EXPR handling [PR113756] Message-ID: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline X-Spam-Status: No, score=-3.8 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_H5, 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: 1790183707656003665 X-GMAIL-MSGID: 1790183707656003665 Hi! ABSU_EXPR unary expr is special because it has a signed integer argument and unsigned integer result (of the same precision). The following testcase is miscompiled since ABSU_EXPR handling has been added to range-op because it uses widest_int::from with the result sign (i.e. UNSIGNED) rather than the operand sign (i.e. SIGNED), so e.g. for the 32-bit int argument mask ends up 0xffffffc1 or something similar and even when it has most significant bit in the precision set, in widest_int (tree-ssa-ccp.cc really should stop using widest_int, but that is I think stage1 task) it doesn't appear to be negative and so bit_value_unop ABSU_EXPR doesn't set the resulting mask/value from oring of the argument and its negation. Fixed thusly, not doing that for GIMPLE_BINARY_RHS because I don't know about a binary op that would need something similar. Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk? 2024-02-06 Jakub Jelinek PR tree-optimization/113756 * range-op.cc (update_known_bitmask): For GIMPLE_UNARY_RHS, use TYPE_SIGN (lh.type ()) instead of sign for widest_int::from of lh_bits value and mask. * gcc.dg/pr113756.c: New test. Jakub --- gcc/range-op.cc.jj 2024-01-03 11:51:28.199777434 +0100 +++ gcc/range-op.cc 2024-02-06 16:51:55.549127825 +0100 @@ -435,8 +435,10 @@ update_known_bitmask (irange &r, tree_co bit_value_unop (code, sign, prec, &widest_value, &widest_mask, TYPE_SIGN (lh.type ()), TYPE_PRECISION (lh.type ()), - widest_int::from (lh_bits.value (), sign), - widest_int::from (lh_bits.mask (), sign)); + widest_int::from (lh_bits.value (), + TYPE_SIGN (lh.type ())), + widest_int::from (lh_bits.mask (), + TYPE_SIGN (lh.type ()))); break; case GIMPLE_BINARY_RHS: bit_value_binop (code, sign, prec, &widest_value, &widest_mask, --- gcc/testsuite/gcc.dg/pr113756.c.jj 2024-02-06 17:00:52.835679796 +0100 +++ gcc/testsuite/gcc.dg/pr113756.c 2024-02-06 17:00:31.159980326 +0100 @@ -0,0 +1,36 @@ +/* PR tree-optimization/113756 */ +/* { dg-do run { target int32plus } } */ +/* { dg-options "-O2" } */ + +int d, e, i, k, l = -8; +signed char h, j; + +int +bar (int n, int o, int p3) +{ + int a = o - p3, b = n - p3, c = a + b, f = -b, g = c < 0 ? -c : c; + return a <= f && a <= g ? o : p3; +} + +void +foo (int *n, unsigned short o) +{ + unsigned p = 8896; + for (; e >= 0; e--) + p = 5377; + for (; h <= 0; h++) + for (; j <= 0; j++) + { + *n = 1611581749; + i = bar (34, p - 5294, *n - 1611581687); + k = i + p + 65535 + o + *n - 1611718251; + if (k != 0) + __builtin_abort (); + } +} + +int +main () +{ + foo (&l, l); +}