# 2016q3 Homework 1 (clz)
###### tags: `sysprog21` `JongSyuGithub`

contributed by <`JonSyuGithub`>
github: https://gtihub.com/JonSyuGithub/clz

## Environment
* OS: Ubuntu 16.04 LTS
* CPU: [i5-457](http://ark.intel.com/products/75043/Intel-Core-i5-4570-Processor-6M-Cache-up-to-3_60-GHz)
* Memory 12GB ($ cat /proc/meminfo)

* Update & Install

$ sudo apt-get update
$ sudo apt-get install build-essential
$ sudo apt-get install linux-tools-common linux-tools-generic
$ sudo apt-get install astyle colordiff gnuplot

## Objective
* Understanding the description about count leading zero (clz) from "https://hackmd.io/s/SkKZBXZT" and comparsion of performance between the following version:
* recursive version
* iteration version
* binary search technique
* byte-shift version
* Harley’s algorithm

## Git

# setting parameter
$ git config --global user.email "your e-mail"
$ git config --global user.name "your name"
$ git config --global push.default matching
$ git remote set-url origin https://github.com/JonSyuGithub/clz-tests.git
			
# update 
$ git add .
$ git commit -m "initial import"
$ git push

## Running

* Compile & Run

$ make
$ make plt

* 每個方法執行4000000的時間差

## References
* [A04: clz](https://hackmd.io/s/B1LHefQ6)