Power
=====
This is an example of using functions in x86 assembly  on a 64-bit Linux
machine. The original source was from [this book](http://mirrors.fe.up.pt/pub/nongnu//pgubook/ProgrammingGroundUp-1-0-booksize.pdf).
However, the book was written for 32-bit computers, not 64-bit, so I
updated this.