//! 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: //! //! ```ignore //! for _ in 0..100 { //! println!("Hello!"); //! } //! ``` //! //! 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: //! //! ```ignore //! debug_assert_eq!(MY_CONSTANT, 100); //! unroll! { //! for i in 0..100 { //! println!("Iteration {}", i); //! } //! } //! ``` //! This means that your tests will catch if you redefine the constant. //! //! To default maximum number of loops to unroll is `64`, but that can be easily increased using the cargo features: //! //! * `limit_128` //! * `limit_256` //! * `limit_512` //! * `limit_1024` //! * `limit_2048`
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