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[59.124.168.89]) by smtp.gmail.com with ESMTPSA id b5sm3108466pfr.26.2021.09.08.10.46.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Sep 2021 10:46:02 -0700 (PDT) From: Greentime Hu To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, aou@eecs.berkeley.edu, palmer@dabbelt.com, paul.walmsley@sifive.com, vincent.chen@sifive.com Subject: [RFC PATCH v8 17/21] riscv: Optimize vector registers initialization Date: Thu, 9 Sep 2021 01:45:29 +0800 Message-Id: X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210908_104603_422667_88271781 X-CRM114-Status: UNSURE ( 8.74 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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(). Co-developed-by: Han-Kuan Chen Signed-off-by: Han-Kuan Chen Signed-off-by: Greentime Hu --- 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 42eb3203fa77..8362d7458c6c 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -442,39 +442,11 @@ 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)::); } /* -- 2.31.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv