[Const-me]

> is compiled with -ffast-math and gcc vectorizes it

Automatic vectorization is extremely limited, in all compilers.

Check this out, feel free to merge if it works in reality not just in the test: https://github.com/Const-me/prettyeq/tree/master

[keurrr]

Thanks. I actually found your repo before seeing this post and sent you an email. Definitely going to port it back to C and merge it in. Thanks so much for this. Hand vectorizing this was on my TODO.