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[0/3] riscv: optimized mem* functions

Message ID 20210615023812.50885-1-mcroce@linux.microsoft.com (mailing list archive)
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Series riscv: optimized mem* functions | expand

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Matteo Croce June 15, 2021, 2:38 a.m. UTC 
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