From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from eggs.gnu.org (eggs.gnu.org [IPv6:2001:470:142:3::10]) by sourceware.org (Postfix) with ESMTPS id C49DA385700B for ; Thu, 19 Oct 2023 08:00:42 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org C49DA385700B Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=loongson.cn ARC-Filter: OpenARC Filter v1.0.0 sourceware.org C49DA385700B Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2001:470:142:3::10 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1697702444; cv=none; b=IeFyKfDiNLMUnivGlTdTTuVKwQG3esviJIAHvYn2SATC7UZuNgty/KaHsZAxBNc4ILxETmn3fnL5G2nz5ZwRbQFb/cVxFNNg5fdCkHgQO4kwROXH7BFXh4CuZrnb0AkxUnJ6N4Z16spJ75mqkiPykAJiiNe3e0JzaWHVIEWjhxI= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1697702444; c=relaxed/simple; bh=uCYORj43KwapnmLPy+/2w+WLiWfdEFYjWx06nNsFg14=; h=Subject:To:From:Message-ID:Date:MIME-Version; b=iYWogPo0SSfpqNWfrZPymES7dlZEtQ1X7+bJAE/Wt1pIM++xxzzs09d/aFuqlmWYxvAgu6ConORwpgUbC2UE6t6JiUuj+UpCCajVs39VAvCWaCJy7JaWZJLqVn4DGmuDEykImOEUOPIvzfEk8Wldz/pa/85SIbLSqOuG0D8K+Vw= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from mail.loongson.cn ([114.242.206.163]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qtNxP-0005E3-NZ for gcc-patches@gcc.gnu.org; Thu, 19 Oct 2023 04:00:42 -0400 Received: from loongson.cn (unknown [10.20.4.107]) by gateway (Coremail) with SMTP id _____8DxfesY4jBlLCMzAA--.31118S3; Thu, 19 Oct 2023 16:00:25 +0800 (CST) Received: from [10.20.4.107] (unknown [10.20.4.107]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxP90X4jBlooUqAA--.26005S3; Thu, 19 Oct 2023 16:00:24 +0800 (CST) Subject: Re: [PATCH v4 0/6] Add Loongson SX/ASX instruction support to LoongArch target. To: Xi Ruoyao , Chenghui Pan , gcc-patches@gcc.gnu.org Cc: i@xen0n.name, xuchenghua@loongson.cn, guojie@loongson.cn References: <20230815010537.1817292-1-panchenghui@loongson.cn> <16be99c1b0f520ff989ac544a9df12a398c62f86.camel@xry111.site> <32f3adc3059dfb3a11a1ee875b2c9d555f04af63.camel@loongson.cn> <73d981766faf984e85722feb3eeabb5d335def4a.camel@xry111.site> From: chenglulu Message-ID: <295a0d47-7315-ac3e-9857-3736380cbbf2@loongson.cn> Date: Thu, 19 Oct 2023 16:00:23 +0800 User-Agent: Mozilla/5.0 (X11; Linux loongarch64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <73d981766faf984e85722feb3eeabb5d335def4a.camel@xry111.site> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-CM-TRANSID:AQAAf8CxP90X4jBlooUqAA--.26005S3 X-CM-SenderInfo: xfkh0wpoxo3qxorr0wxvrqhubq/ X-Coremail-Antispam: 1Uk129KBj9xXoW7JF17Gw1xKr43Ar18tr43Jwc_yoWkZrXE93 Z3KrykCwnxCFs3WF17Cr4YvF9Y9ayUuryfAr4qqF4Sy393Xas5GFyvqrn0vrs5JF42qrZx Kr4vgr4Iv342vosvyTuYvTs0mTUanT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUj1kv1TuYvT s0mT0YCTnIWjqI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUI cSsGvfJTRUUUbxkYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20x vaj40_Wr0E3s1l1IIY67AEw4v_Jr0_Jr4l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWUCVW8JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8JVWxJwA2z4x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_ Cr1j6rxdM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx1l5I 8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1Y6r17McIj6I8E87Iv67AK xVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IY64vIr41lc7I2V7IY0VAS07AlzV AYIcxG8wCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E 14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_JF0_Jw1lIx kGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAF wI0_Jr0_Gr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r 4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Jr0_GrUvcSsGvfC2KfnxnUUI43ZEXa7IU1QVy3UU UUU== Received-SPF: pass client-ip=114.242.206.163; envelope-from=chenglulu@loongson.cn; helo=mail.loongson.cn X-Spam_score_int: -51 X-Spam_score: -5.2 X-Spam_bar: ----- X-Spam_report: (-5.2 / 5.0 requ) BAYES_00=-1.9,NICE_REPLY_A=-3.339,SPF_HELO_NONE=0.001,SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Status: No, score=-9.4 required=5.0 tests=BAYES_00,KAM_DMARC_STATUS,NICE_REPLY_A,SPF_FAIL,SPF_HELO_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: 在 2023/8/20 下午4:25, Xi Ruoyao 写道: > On Thu, 2023-08-17 at 15:20 +0800, Chenghui Pan wrote: >> Seems ARMv8-A only guarantees to preserve low 64-bit value of >> NEON/floating-point register value. I'm not sure that I modify the >> testcase in the right way and maybe we need more investigations. Any >> ideas or suggestion? Hi, Ruoyao: The implementation of hook loongarch_hard_regno_call_part_clobbered results in all vector registers being caller saved registers. So no data will be lost during the function call. > Sorry, the following sentence in GCC manual section 6.47.5.2 suggests my > test case is not valid: > > "As with global register variables, it is recommended that you choose a > register that is normally saved and restored by function calls on your > machine, so that calls to library routines will not clobber it." > > So when I use asm(name), the compiler has no obligation to guarantee > that it will ever work like a normal variable after a function call. > > But I still need to verify that the compiler correctly understands only > the low 64 bits of the vector register is saved. I'll try to make > another test case... >