From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by sourceware.org (Postfix) with ESMTP id C363B3858C83 for ; Mon, 28 Feb 2022 02:55:55 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org C363B3858C83 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=loongson.cn Received: from [10.20.4.52] (unknown [10.20.4.52]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9DxWMq4ORxigv8HAA--.14294S2; Mon, 28 Feb 2022 10:55:52 +0800 (CST) Subject: Re: [PATCH v7 11/12] LoongArch Port: gcc/testsuite To: Xi Ruoyao , xuchenghua@loongson.cn, gcc-patches@gcc.gnu.org Cc: joseph@codesourcery.com References: <20220212031142.1165933-1-xuchenghua@loongson.cn> <20220212031142.1165933-12-xuchenghua@loongson.cn> <116a44c84b7986d4b3f2808242e38c2a34a3b2a2.camel@mengyan1223.wang> From: =?UTF-8?B?56iL55KQ55KQ?= Message-ID: <9075ecf6-41b1-4f2f-59b3-f2fdc3912682@loongson.cn> Date: Mon, 28 Feb 2022 10:55:52 +0800 User-Agent: Mozilla/5.0 (X11; Linux mips64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <116a44c84b7986d4b3f2808242e38c2a34a3b2a2.camel@mengyan1223.wang> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-CM-TRANSID: AQAAf9DxWMq4ORxigv8HAA--.14294S2 X-Coremail-Antispam: 1UD129KBjvdXoWrtr4kJr15ur4xAFyUuw17ZFb_yoWktrbE9F 4qyFsFvw1UZa1kK3ZIqF98XFWUGa1vqr1vyrs5ZwsrJ3sFv3Z8trZ8u3WrurW3WrWIvrWa qrs2qFnxArZ8KjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbs8FF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr0_ Cr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AKxVWxJr 0_GcWle2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_Jr0_Jr4lYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvEwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lc7I2V7IY0VAS07AlzVAY IcxG8wCY02Avz4vE-syl42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2 IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v2 6r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2 IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rVWrZr1j6s0DMIIF0xvEx4A2 jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Jr0_GrUvcSsGvfC2KfnxnUUI43 ZEXa7VUbrMaUUUUUU== X-CM-SenderInfo: xfkh0wpoxo3qxorr0wxvrqhubq/ X-Spam-Status: No, score=-5.4 required=5.0 tests=BAYES_00, BODY_8BITS, KAM_DMARC_STATUS, NICE_REPLY_A, SPF_HELO_PASS, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Feb 2022 02:55:57 -0000 Thanks,  speculation barrier is not needed for loongarch. I have removed the warning. 在 2022/2/25 上午3:32, Xi Ruoyao 写道: > On Sat, 2022-02-12 at 11:11 +0800, xuchenghua@loongson.cn wrote: >> From: chenglulu >> >> 2022-02-12  Chenghua Xu  >>             Lulu Cheng  >> >> gcc/testsuite/ > spec-barrier tests fail with: > > ./testsuite/c-c++-common/spec-barrier-1.c:21:3: warning: this target > does not define a speculation barrier; your program will still execute > correctly, but incorrect speculation may not be restricted > > I'd seen some news saying your uarch has in-silicon defense for > speculation related vulnerabilities. If this is true you can just make > __builtin_speculation_safe_value a nop. Quote from gcc internal doc: > >> If this pattern is not defined then the default expansion of >> '__builtin_speculation_safe_value' will emit a warning. You can >> suppress this warning by defining this pattern with a final >> condition of '0' (zero), which tells the compiler that a >> speculation barrier is not needed for this target.