From: Matteo Croce <mcroce@xxxxxxxxxxxxx>
Rewrite the generic mem{cpy,move,set} so that memory is accessed with
the widest size possible, but without doing unaligned accesses.
This was originally posted as C string functions for RISC-V[1], but as
there was no specific RISC-V code, it was proposed for the generic
lib/string.c implementation.
Tested on RISC-V and on x86_64 by undefining __HAVE_ARCH_MEM{CPY,SET,MOVE}
and HAVE_EFFICIENT_UNALIGNED_ACCESS.
Further testing on big endian machines will be appreciated, as I don't
have such hardware at the moment.
[1] https://lore.kernel.org/linux-riscv/20210617152754.17960-1-mcroce@xxxxxxxxxxxxxxxxxxx/
Matteo Croce (3):
lib/string: optimized memcpy
lib/string: optimized memmove
lib/string: optimized memset
lib/string.c | 129 ++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 112 insertions(+), 17 deletions(-)
--
2.31.1
