Re: improve strlen

Another 0.5 usec eliminated, now the difference is: 14.0 vs. 13.5
usec..

if ( v & 0x00008080 )
return s - ((v & 0x00000080) >> 7);

return s + 2 - ((v & 0x00800000) >> 23);

The next step is to handle 64 or 128 bits per iteration (atleast
64-bits should be trivial with MMX/SSE or natively 64-bit platform if
writing this in C/C++ ..)

Note that such version is liable for crashing because we cannot
guarantee that reads are within allocated boundaries anymore (unless we
allocate the memory ourselves taking care of the issue?)

.