From nobody Tue Feb 10 20:30:12 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1662038978714222.67102070101112; Thu, 1 Sep 2022 06:29:38 -0700 (PDT) Received: from localhost ([::1]:59542 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oTkGG-0004Ue-6Z for importer@patchew.org; Thu, 01 Sep 2022 09:29:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41730) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oTk6h-0007Zb-Sk; Thu, 01 Sep 2022 09:19:43 -0400 Received: from [200.168.210.66] (port=59496 helo=outlook.eldorado.org.br) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oTk6g-0002b5-9k; Thu, 01 Sep 2022 09:19:43 -0400 Received: from p9ibm ([10.10.71.235]) by outlook.eldorado.org.br over TLS secured channel with Microsoft SMTPSVC(8.5.9600.16384); Thu, 1 Sep 2022 10:18:16 -0300 Received: from eldorado.org.br (unknown [10.10.70.45]) by p9ibm (Postfix) with ESMTP id 828E88002C5; Thu, 1 Sep 2022 10:18:16 -0300 (-03) From: =?UTF-8?q?V=C3=ADctor=20Colombo?= To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org Cc: clg@kaod.org, danielhb413@gmail.com, david@gibson.dropbear.id.au, groug@kaod.org, richard.henderson@linaro.org, victor.colombo@eldorado.org.br, matheus.ferst@eldorado.org.br, lucas.araujo@eldorado.org.br, leandro.lupori@eldorado.org.br, lucas.coutinho@eldorado.org.br Subject: [PATCH 07/19] target/ppc: Zero second doubleword of VSR registers for FPR insns Date: Thu, 1 Sep 2022 10:17:44 -0300 Message-Id: <20220901131756.26060-8-victor.colombo@eldorado.org.br> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220901131756.26060-1-victor.colombo@eldorado.org.br> References: <20220901131756.26060-1-victor.colombo@eldorado.org.br> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-OriginalArrivalTime: 01 Sep 2022 13:18:16.0963 (UTC) FILETIME=[4C2E0D30:01D8BE05] X-Host-Lookup-Failed: Reverse DNS lookup failed for 200.168.210.66 (failed) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=200.168.210.66; envelope-from=victor.colombo@eldorado.org.br; helo=outlook.eldorado.org.br X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZM-MESSAGEID: 1662038978942100001 FPR register are mapped to the first doubleword of the VSR registers. Since PowerISA v3.1, the second doubleword of the target register must be zeroed for FP instructions. This patch does it by writting 0 to the second dw everytime the first dw is being written using set_fpr. Signed-off-by: V=C3=ADctor Colombo Reviewed-by: Daniel Henrique Barboza --- target/ppc/translate.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/target/ppc/translate.c b/target/ppc/translate.c index 388337f81b..a0fa419a1f 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -6443,6 +6443,14 @@ static inline void get_fpr(TCGv_i64 dst, int regno) static inline void set_fpr(int regno, TCGv_i64 src) { tcg_gen_st_i64(src, cpu_env, fpr_offset(regno)); + /* + * Before PowerISA v3.1 the result of doubleword 1 of the VSR + * corresponding to the target FPR was undefined. However, + * most (if not all) real hardware were setting the result to 0. + * Starting at ISA v3.1, the result for doubleword 1 is now defined + * to be 0. + */ + tcg_gen_st_i64(tcg_constant_i64(0), cpu_env, vsr64_offset(regno, false= )); } =20 static inline void get_avr64(TCGv_i64 dst, int regno, bool high) --=20 2.25.1