Crunchy
The crunchy unroller - deterministically unroll constant loops. For number "crunching".
The Rust optimizer will unroll constant loops that don't use the loop variable, like this:
for _ in 0..100
However, using the loop variable will cause it to never unroll the loop. This is unfortunate because it means that you can't constant-fold the loop variable, and if you end up stomping on the registers it will have to do a load for each iteration. This crate ensures that your code is unrolled and const-folded. It only works on literals, unfortunately, but there's a work-around:
debug_assert_eq!;
unroll!
This means that your tests will catch if you redefine the constant.