Message ID | 20210615023812.50885-1-mcroce@linux.microsoft.com (mailing list archive) |
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[37.119.128.179]) by smtp.gmail.com with ESMTPSA id cn25sm834966edb.69.2021.06.14.19.39.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Jun 2021 19:39:35 -0700 (PDT) From: Matteo Croce <mcroce@linux.microsoft.com> To: linux-riscv@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, Atish Patra <atish.patra@wdc.com>, Emil Renner Berthing <kernel@esmil.dk>, Akira Tsukamoto <akira.tsukamoto@gmail.com>, Drew Fustini <drew@beagleboard.org>, Bin Meng <bmeng.cn@gmail.com> Subject: [PATCH 0/3] riscv: optimized mem* functions Date: Tue, 15 Jun 2021 04:38:09 +0200 Message-Id: <20210615023812.50885-1-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210615_033937_969156_D86169F1 X-CRM114-Status: UNSURE ( 8.82 ) X-CRM114-Notice: Please train this message. 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riscv: optimized mem* functions
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From: Matteo Croce <mcroce@microsoft.com> Replace the assembly mem{cpy,move,set} with C equivalent. Try to access RAM with the largest bit width possible, but without doing unaligned accesses. Tested on a BeagleV Starlight with a SiFive U74 core, where the improvement is noticeable. Matteo Croce (3): riscv: optimized memcpy riscv: optimized memmove riscv: optimized memset arch/riscv/include/asm/string.h | 18 ++-- arch/riscv/kernel/Makefile | 1 - arch/riscv/kernel/riscv_ksyms.c | 17 ---- arch/riscv/lib/Makefile | 4 +- arch/riscv/lib/memcpy.S | 108 --------------------- arch/riscv/lib/memmove.S | 64 ------------- arch/riscv/lib/memset.S | 113 ---------------------- arch/riscv/lib/string.c | 162 ++++++++++++++++++++++++++++++++ 8 files changed, 172 insertions(+), 315 deletions(-) delete mode 100644 arch/riscv/kernel/riscv_ksyms.c delete mode 100644 arch/riscv/lib/memcpy.S delete mode 100644 arch/riscv/lib/memmove.S delete mode 100644 arch/riscv/lib/memset.S create mode 100644 arch/riscv/lib/string.c