From nobody Tue Feb 10 20:50:16 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 1663402477469995.9698100052968; Sat, 17 Sep 2022 01:14:37 -0700 (PDT) Received: from localhost ([::1]:41988 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oZSyC-0001Az-8a for importer@patchew.org; Sat, 17 Sep 2022 04:14:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38982) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oZSkF-0006iN-3f for qemu-devel@nongnu.org; Sat, 17 Sep 2022 04:00:11 -0400 Received: from mail.loongson.cn ([114.242.206.163]:57656 helo=loongson.cn) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oZSk0-0008Si-CA for qemu-devel@nongnu.org; Sat, 17 Sep 2022 04:00:10 -0400 Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8DxBOJ2fiVjHQccAA--.40868S7; Sat, 17 Sep 2022 15:59:52 +0800 (CST) From: Song Gao To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org, peter.maydell@linaro.org, alex.bennee@linaro.org, gaosong@loongson.cn, maobibo@loongson.cn, yangxiaojuan@loongson.cn Subject: [PATCH 5/5] target/loongarch: div if x/0 set dividend to 0 Date: Sat, 17 Sep 2022 15:59:50 +0800 Message-Id: <20220917075950.1412309-6-gaosong@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220917075950.1412309-1-gaosong@loongson.cn> References: <20220917075950.1412309-1-gaosong@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8DxBOJ2fiVjHQccAA--.40868S7 X-Coremail-Antispam: 1UD129KBjvJXoW7Zr1Utr4fuFWrWryDWw47XFb_yoW8Kw4rpr 1kur4aqaykJFZ3Jr42v3WUZr17tF9Ykw4jq3srtr45Grs8Zr1DArs7K3sIgFy8GayrZrWF vF95u3WjgF45J3JanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnUUvcSsGvfC2KfnxnUUI43ZEXa7xR_UUUUUUUUU== X-CM-SenderInfo: 5jdr20tqj6z05rqj20fqof0/ 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=114.242.206.163; envelope-from=gaosong@loongson.cn; helo=loongson.cn X-Spam_score_int: -4 X-Spam_score: -0.5 X-Spam_bar: / X-Spam_report: (-0.5 / 5.0 requ) BAYES_00=-1.9, FORGED_SPF_HELO=1, KHOP_HELO_FCRDNS=0.399, SPF_HELO_PASS=-0.001, T_SPF_TEMPERROR=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: 1663402478222100001 Content-Type: text/plain; charset="utf-8" div.d, div.du, div,w, div.wu, the LoongArch host if x/0 the result is 0. So we set the divisor to 1 and the dividend to 0. Signed-off-by: Song Gao --- target/loongarch/insn_trans/trans_arith.c.inc | 34 +++++++++++++++---- 1 file changed, 27 insertions(+), 7 deletions(-) diff --git a/target/loongarch/insn_trans/trans_arith.c.inc b/target/loongar= ch/insn_trans/trans_arith.c.inc index 8e45eadbc8..c97afb16f9 100644 --- a/target/loongarch/insn_trans/trans_arith.c.inc +++ b/target/loongarch/insn_trans/trans_arith.c.inc @@ -147,12 +147,28 @@ static void prep_divisor_du(TCGv ret, TCGv src2) tcg_gen_movcond_tl(TCG_COND_EQ, ret, src2, zero, one, src2); } =20 +static void prep_div(TCGv divisor, TCGv dividend, TCGv src1, TCGv src2) +{ + TCGv zero =3D tcg_constant_tl(0); + TCGv one =3D tcg_constant_tl(1); + + /* + * If x / 0, set the diviend to 0 set the divisor to 1 + * this is the same with LoongArch host. + */ + tcg_gen_movcond_tl(TCG_COND_EQ, dividend, src2, zero, zero, src1); + tcg_gen_movcond_tl(TCG_COND_EQ, divisor, src2, zero, one, src2); +} + static void gen_div_d(TCGv dest, TCGv src1, TCGv src2) { TCGv t0 =3D tcg_temp_new(); - prep_divisor_d(t0, src1, src2); - tcg_gen_div_tl(dest, src1, t0); + TCGv t1 =3D tcg_temp_new(); + + prep_div(t0, t1, src1, src2); + tcg_gen_div_tl(dest, t1, t0); tcg_temp_free(t0); + tcg_temp_free(t1); } =20 static void gen_rem_d(TCGv dest, TCGv src1, TCGv src2) @@ -166,9 +182,11 @@ static void gen_rem_d(TCGv dest, TCGv src1, TCGv src2) static void gen_div_du(TCGv dest, TCGv src1, TCGv src2) { TCGv t0 =3D tcg_temp_new(); - prep_divisor_du(t0, src2); - tcg_gen_divu_tl(dest, src1, t0); + TCGv t1 =3D tcg_temp_new(); + prep_div(t0, t1, src1, src2); + tcg_gen_divu_tl(dest, t1, t0); tcg_temp_free(t0); + tcg_temp_free(t1); } =20 static void gen_rem_du(TCGv dest, TCGv src1, TCGv src2) @@ -182,10 +200,12 @@ static void gen_rem_du(TCGv dest, TCGv src1, TCGv src= 2) static void gen_div_w(TCGv dest, TCGv src1, TCGv src2) { TCGv t0 =3D tcg_temp_new(); - /* We need not check for integer overflow for div_w. */ - prep_divisor_du(t0, src2); - tcg_gen_div_tl(dest, src1, t0); + TCGv t1 =3D tcg_temp_new(); + + prep_div(t0, t1, src1, src2); + tcg_gen_div_tl(dest, t1, t0); tcg_temp_free(t0); + tcg_temp_free(t1); } =20 static void gen_rem_w(TCGv dest, TCGv src1, TCGv src2) --=20 2.31.1