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Wed, 31 Jan 2024 08:44:21 +0000 (UTC) Received: from tucnak.zalov.cz (unknown [10.39.192.70]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 799311C060AF; Wed, 31 Jan 2024 08:44:21 +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 40V8iIF5267029 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Wed, 31 Jan 2024 09:44:18 +0100 Received: (from jakub@localhost) by tucnak.zalov.cz (8.17.1/8.17.1/Submit) id 40V8iG2U267028; Wed, 31 Jan 2024 09:44:16 +0100 Date: Wed, 31 Jan 2024 09:44:16 +0100 From: Jakub Jelinek To: Richard Biener , Eric Botcazou , Segher Boessenkool , Jeff Law Cc: gcc-patches@gcc.gnu.org Subject: [PATCH] simplify-rtx: Fix up last argument to simplify_gen_unary [PR113656] 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=-4.0 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, KAM_SHORT, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, 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: 1789595267891730450 X-GMAIL-MSGID: 1789595267891730450 Hi! When simplifying e.g. (float_truncate:SF (float_truncate:DF (reg:XF)) or (float_truncate:SF (float_extend:XF (reg:DF)) etc. into (float_truncate:SF (reg:XF)) or (float_truncate:SF (reg:DF)) we call simplify_gen_unary with incorrect op_mode argument, it should be the argument's mode, but we call it with the outer mode instead. As these are all floating point operations, the argument always has non-VOIDmode and so we can just use that mode (as done in similar simplifications a few lines later), but neither FLOAT_TRUNCATE nor FLOAT_EXTEND are operations that should have the same modes of operand and result. This bug hasn't been a problem for years because normally op_mode is used only if the mode of op is VOIDmode, otherwise it is redundant, but r10-2139 added an assertion in some spots that op_mode is right even in such cases. Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk? 2024-01-31 Jakub Jelinek PR rtl-optimization/113656 * simplify-rtx.cc (simplify_context::simplify_unary_operation_1) : Fix up last argument to simplify_gen_unary. * gcc.target/i386/pr113656.c: New test. Jakub --- gcc/simplify-rtx.cc.jj 2024-01-03 11:51:32.828713189 +0100 +++ gcc/simplify-rtx.cc 2024-01-30 19:34:30.516934480 +0100 @@ -1305,7 +1305,7 @@ simplify_context::simplify_unary_operati > GET_MODE_UNIT_SIZE (mode) ? FLOAT_TRUNCATE : FLOAT_EXTEND, mode, - XEXP (op, 0), mode); + XEXP (op, 0), GET_MODE (XEXP (op, 0))); /* (float_truncate (float x)) is (float x) */ if ((GET_CODE (op) == FLOAT || GET_CODE (op) == UNSIGNED_FLOAT) --- gcc/testsuite/gcc.target/i386/pr113656.c.jj 2024-01-30 19:38:29.029608721 +0100 +++ gcc/testsuite/gcc.target/i386/pr113656.c 2024-01-30 19:37:10.519703443 +0100 @@ -0,0 +1,12 @@ +/* PR rtl-optimization/113656 */ +/* { dg-do compile } */ +/* { dg-options "-O3 -frounding-math -funsafe-math-optimizations -mavx512fp16 -mavx512vl" } */ + +_Float16 a[8]; + +void +foo () +{ + for (int i = 0; i < 8; i++) + a[i] = i - 8.4; +}