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[114.34.229.221]) by smtp.gmail.com with ESMTPSA id e1sm2196056pfl.162.2020.09.10.01.13.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Sep 2020 01:13:14 -0700 (PDT) From: Greentime Hu To: greentime.hu@sifive.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, aou@eecs.berkeley.edu, palmer@dabbelt.com, paul.walmsley@sifive.com Cc: Han-Kuan Chen Subject: [RFC PATCH v7 18/21] riscv: Optimize vector registers initialization Date: Thu, 10 Sep 2020 16:12:13 +0800 Message-Id: <7214a2bb57fc9711b38a49f398780241389e73aa.1599719352.git.greentime.hu@sifive.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch optimizes the initialization or invalidation of vector registers. It can reduce the code sizes of vector_flush_cpu_state() and reset_regs(). Signed-off-by: Greentime Hu Signed-off-by: Han-Kuan Chen --- arch/riscv/kernel/head.S | 30 +----------------------- arch/riscv/kernel/kernel_mode_vector.c | 32 ++------------------------ 2 files changed, 3 insertions(+), 59 deletions(-) diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index 74f2fd8430e0..2fbb4df368b1 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -375,39 +375,11 @@ ENTRY(reset_regs) li t1, SR_VS csrs CSR_STATUS, t1 - vsetvli t1, x0, e8, m1 + vsetvli t1, x0, e8, m8 vmv.v.i v0, 0 - vmv.v.i v1, 0 - vmv.v.i v2, 0 - vmv.v.i v3, 0 - vmv.v.i v4, 0 - vmv.v.i v5, 0 - vmv.v.i v6, 0 - vmv.v.i v7, 0 vmv.v.i v8, 0 - vmv.v.i v9, 0 - vmv.v.i v10, 0 - vmv.v.i v11, 0 - vmv.v.i v12, 0 - vmv.v.i v13, 0 - vmv.v.i v14, 0 - vmv.v.i v15, 0 vmv.v.i v16, 0 - vmv.v.i v17, 0 - vmv.v.i v18, 0 - vmv.v.i v19, 0 - vmv.v.i v20, 0 - vmv.v.i v21, 0 - vmv.v.i v22, 0 - vmv.v.i v23, 0 vmv.v.i v24, 0 - vmv.v.i v25, 0 - vmv.v.i v26, 0 - vmv.v.i v27, 0 - vmv.v.i v28, 0 - vmv.v.i v29, 0 - vmv.v.i v30, 0 - vmv.v.i v31, 0 /* note that the caller must clear SR_VS */ #endif /* CONFIG_VECTOR */ diff --git a/arch/riscv/kernel/kernel_mode_vector.c b/arch/riscv/kernel/kernel_mode_vector.c index 108cfafe7496..b84618630edf 100644 --- a/arch/riscv/kernel/kernel_mode_vector.c +++ b/arch/riscv/kernel/kernel_mode_vector.c @@ -86,39 +86,11 @@ static void vector_flush_cpu_state(void) long tmp; __asm__ __volatile__ ( - "vsetvli %0, x0, e8, m1\n" + "vsetvli %0, x0, e8, m8\n" "vmv.v.i v0, 0\n" - "vmv.v.i v1, 0\n" - "vmv.v.i v2, 0\n" - "vmv.v.i v3, 0\n" - "vmv.v.i v4, 0\n" - "vmv.v.i v5, 0\n" - "vmv.v.i v6, 0\n" - "vmv.v.i v7, 0\n" "vmv.v.i v8, 0\n" - "vmv.v.i v9, 0\n" - "vmv.v.i v10, 0\n" - "vmv.v.i v11, 0\n" - "vmv.v.i v12, 0\n" - "vmv.v.i v13, 0\n" - "vmv.v.i v14, 0\n" - "vmv.v.i v15, 0\n" "vmv.v.i v16, 0\n" - "vmv.v.i v17, 0\n" - "vmv.v.i v18, 0\n" - "vmv.v.i v19, 0\n" - "vmv.v.i v20, 0\n" - "vmv.v.i v21, 0\n" - "vmv.v.i v22, 0\n" - "vmv.v.i v23, 0\n" - "vmv.v.i v24, 0\n" - "vmv.v.i v25, 0\n" - "vmv.v.i v26, 0\n" - "vmv.v.i v27, 0\n" - "vmv.v.i v28, 0\n" - "vmv.v.i v29, 0\n" - "vmv.v.i v30, 0\n" - "vmv.v.i v31, 0\n":"=r"(tmp)::); + "vmv.v.i v24, 0\n":"=r"(tmp)::); } /* -- 2.28.0 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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C4E11C2BB84 for ; 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[114.34.229.221]) by smtp.gmail.com with ESMTPSA id e1sm2196056pfl.162.2020.09.10.01.13.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Sep 2020 01:13:14 -0700 (PDT) From: Greentime Hu To: greentime.hu@sifive.com, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, aou@eecs.berkeley.edu, palmer@dabbelt.com, paul.walmsley@sifive.com Subject: [RFC PATCH v7 18/21] riscv: Optimize vector registers initialization Date: Thu, 10 Sep 2020 16:12:13 +0800 Message-Id: <7214a2bb57fc9711b38a49f398780241389e73aa.1599719352.git.greentime.hu@sifive.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200910_041317_535244_28EB115E X-CRM114-Status: GOOD ( 10.61 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Han-Kuan Chen Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org This patch optimizes the initialization or invalidation of vector registers. It can reduce the code sizes of vector_flush_cpu_state() and reset_regs(). Signed-off-by: Greentime Hu Signed-off-by: Han-Kuan Chen --- arch/riscv/kernel/head.S | 30 +----------------------- arch/riscv/kernel/kernel_mode_vector.c | 32 ++------------------------ 2 files changed, 3 insertions(+), 59 deletions(-) diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index 74f2fd8430e0..2fbb4df368b1 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -375,39 +375,11 @@ ENTRY(reset_regs) li t1, SR_VS csrs CSR_STATUS, t1 - vsetvli t1, x0, e8, m1 + vsetvli t1, x0, e8, m8 vmv.v.i v0, 0 - vmv.v.i v1, 0 - vmv.v.i v2, 0 - vmv.v.i v3, 0 - vmv.v.i v4, 0 - vmv.v.i v5, 0 - vmv.v.i v6, 0 - vmv.v.i v7, 0 vmv.v.i v8, 0 - vmv.v.i v9, 0 - vmv.v.i v10, 0 - vmv.v.i v11, 0 - vmv.v.i v12, 0 - vmv.v.i v13, 0 - vmv.v.i v14, 0 - vmv.v.i v15, 0 vmv.v.i v16, 0 - vmv.v.i v17, 0 - vmv.v.i v18, 0 - vmv.v.i v19, 0 - vmv.v.i v20, 0 - vmv.v.i v21, 0 - vmv.v.i v22, 0 - vmv.v.i v23, 0 vmv.v.i v24, 0 - vmv.v.i v25, 0 - vmv.v.i v26, 0 - vmv.v.i v27, 0 - vmv.v.i v28, 0 - vmv.v.i v29, 0 - vmv.v.i v30, 0 - vmv.v.i v31, 0 /* note that the caller must clear SR_VS */ #endif /* CONFIG_VECTOR */ diff --git a/arch/riscv/kernel/kernel_mode_vector.c b/arch/riscv/kernel/kernel_mode_vector.c index 108cfafe7496..b84618630edf 100644 --- a/arch/riscv/kernel/kernel_mode_vector.c +++ b/arch/riscv/kernel/kernel_mode_vector.c @@ -86,39 +86,11 @@ static void vector_flush_cpu_state(void) long tmp; __asm__ __volatile__ ( - "vsetvli %0, x0, e8, m1\n" + "vsetvli %0, x0, e8, m8\n" "vmv.v.i v0, 0\n" - "vmv.v.i v1, 0\n" - "vmv.v.i v2, 0\n" - "vmv.v.i v3, 0\n" - "vmv.v.i v4, 0\n" - "vmv.v.i v5, 0\n" - "vmv.v.i v6, 0\n" - "vmv.v.i v7, 0\n" "vmv.v.i v8, 0\n" - "vmv.v.i v9, 0\n" - "vmv.v.i v10, 0\n" - "vmv.v.i v11, 0\n" - "vmv.v.i v12, 0\n" - "vmv.v.i v13, 0\n" - "vmv.v.i v14, 0\n" - "vmv.v.i v15, 0\n" "vmv.v.i v16, 0\n" - "vmv.v.i v17, 0\n" - "vmv.v.i v18, 0\n" - "vmv.v.i v19, 0\n" - "vmv.v.i v20, 0\n" - "vmv.v.i v21, 0\n" - "vmv.v.i v22, 0\n" - "vmv.v.i v23, 0\n" - "vmv.v.i v24, 0\n" - "vmv.v.i v25, 0\n" - "vmv.v.i v26, 0\n" - "vmv.v.i v27, 0\n" - "vmv.v.i v28, 0\n" - "vmv.v.i v29, 0\n" - "vmv.v.i v30, 0\n" - "vmv.v.i v31, 0\n":"=r"(tmp)::); + "vmv.v.i v24, 0\n":"=r"(tmp)::); } /* -- 2.28.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv