On 02/07/2021 13:31, Matteo Croce wrote:
From: Matteo Croce <mcroce@xxxxxxxxxxxxx> Rewrite the generic memcpy() to copy a word at time, without generating unaligned accesses. The procedure is made of three steps: First copy data one byte at time until the destination buffer is aligned to a long boundary. Then copy the data one long at time shifting the current and the next long to compose a long at every cycle. Finally, copy the remainder one byte at time. This is the improvement on RISC-V: original aligned: 75 Mb/s original unaligned: 75 Mb/s new aligned: 114 Mb/s new unaligned: 107 Mb/s and this the binary size increase according to bloat-o-meter: Function old new delta memcpy 36 324 +288 Signed-off-by: Matteo Croce <mcroce@xxxxxxxxxxxxx> --- lib/string.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 77 insertions(+), 3 deletions(-)
Doesn't arch/riscv/lib/memcpy.S also exist for an architecture optimised version? I would have thought the lib/string.c version was not being used? -- Ben Dooks http://www.codethink.co.uk/ Senior Engineer Codethink - Providing Genius https://www.codethink.co.uk/privacy.html
