How to write a better strlen function?

Question

I am reading \"Write Great Code Volume 2\" and it shows the following strlen impelementation:

int myStrlen( char *s )
{
    char *start;
    start = s;
    w         


        

Answer 1

Answering OP's question about where to find suggestions how to write code for performance, here's link to MIT OpenCourse on writing Optimized C Code (look for "Materials" link on the left of page).