From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D5FEBC4332F for ; Thu, 20 Oct 2022 11:13:30 +0000 (UTC) Received: from localhost ([::1]:49868 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1olTUO-0003Dr-0U for qemu-devel@archiver.kernel.org; Thu, 20 Oct 2022 07:13:29 -0400 Received: from [::1] (helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1olTPp-0007uR-9I for qemu-devel@archiver.kernel.org; Thu, 20 Oct 2022 07:08:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55152) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1olT1W-0001YU-FR; Thu, 20 Oct 2022 06:43:41 -0400 Received: from out30-130.freemail.mail.aliyun.com ([115.124.30.130]:60600) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1olT1U-0003wH-VM; Thu, 20 Oct 2022 06:43:38 -0400 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R951e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=ay29a033018046060; MF=zhiwei_liu@linux.alibaba.com; NM=1; PH=DS; RN=8; SR=0; TI=SMTPD_---0VSeuKBT_1666262610; Received: from roman-VirtualBox.hz.ali.com(mailfrom:zhiwei_liu@linux.alibaba.com fp:SMTPD_---0VSeuKBT_1666262610) by smtp.aliyun-inc.com; Thu, 20 Oct 2022 18:43:31 +0800 From: LIU Zhiwei To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Cc: Alistair.Francis@wdc.com, palmer@dabbelt.com, bin.meng@windriver.com, richard.henderson@linaro.org, lzw194868@alibaba-inc.com, LIU Zhiwei Subject: [RFC PATCH 3/3] tcg/riscv: Remove a wrong optimization for addsub2 Date: Thu, 20 Oct 2022 18:41:54 +0800 Message-Id: <20221020104154.4276-4-zhiwei_liu@linux.alibaba.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221020104154.4276-1-zhiwei_liu@linux.alibaba.com> References: <20221020104154.4276-1-zhiwei_liu@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=115.124.30.130; envelope-from=zhiwei_liu@linux.alibaba.com; helo=out30-130.freemail.mail.aliyun.com X-Spam_score_int: -98 X-Spam_score: -9.9 X-Spam_bar: --------- X-Spam_report: (-9.9 / 5.0 requ) BAYES_00=-1.9, ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, USER_IN_DEF_SPF_WL=-7.5 autolearn=ham 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" It's not clear what it is doing here. And it's wrong because bl and al are both register, so we can't add them by an ADDI instruction. Signed-off-by: LIU Zhiwei --- tcg/riscv/tcg-target.c.inc | 3 --- 1 file changed, 3 deletions(-) diff --git a/tcg/riscv/tcg-target.c.inc b/tcg/riscv/tcg-target.c.inc index bfdf2bea69..a07fd0864f 100644 --- a/tcg/riscv/tcg-target.c.inc +++ b/tcg/riscv/tcg-target.c.inc @@ -705,9 +705,6 @@ static void tcg_out_addsub2(TCGContext *s, tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_TMP0, rl, al); } - } else if (rl == al && rl == bl) { - tcg_out_opc_imm(s, OPC_SLTI, TCG_REG_TMP0, al, 0); - tcg_out_opc_reg(s, opc_addi, rl, al, bl); } else { tcg_out_opc_reg(s, opc_add, rl, al, bl); tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_TMP0, -- 2.25.1