• Miao Xie's avatar
    lib/memcopy: use glibc version · 967a6df8
    Miao Xie authored
    the kernel's memcpy and memmove is very inefficient. But the glibc version is
    quite fast, in some cases it is 10 times faster than the kernel version. So I
    introduce some memory copy macros and functions of the glibc to improve the
    kernel version's performance.
    
    The strategy of the memory functions is:
    1. Copy bytes until the destination pointer is aligned.
    2. Copy words in unrolled loops.  If the source and destination are not
       aligned in the same way, use word memory operations, but shift and merge
       two read words before writing.
    3. Copy the few remaining bytes.
    
    Signed-off-by: Miao Xie <miaox*******>
    
    Conflicts:
    
    	lib/Makefile
    967a6df8