This is a simple crc32 implementation in C99.
The only two files you really need are in src/
I have a sanity test in tests/, but it was really just for me to quickly check if it worked.
I also have the performance reporting code in there too.
To run the test yourself, simply run make, then the test exectuable that is built.
These tests were performed on an Intel Core 2 Duo E8400 @ 3GHz, running the test a handful of times, then getting the average results. The rate is calculated by timing how long it takes to crc32 "hello-world" 1 000 000 times at various optimization levels on gcc.
| Rate (Mb/sec) | Optimization level |
|---|---|
| 26.252932 | -O0 |
| 62.216239 | -O2 |
| 61.405990 | -Ofast |
Testing the variant without the branch removed (See crc32.c):
| Rate (Mb/sec) | Optimization level |
|---|---|
| 20.439034 | -O0 |
| 51.968760 | -O2 |
| 58.866903 | -Ofast |
crc32 - calculate crc32 checksums of data
Written in 2020 by Ayman El Didi
To the extent possible under law, the author(s) have dedicated all
domain worldwide. This software is distributed without any warranty.
You should have received a copy of the CC0 Public Domain Dedication along
with this software. If not, see http://creativecommons.org/publicdomain/zero/1.0/.