Macro check_misalign4

macro_rules! check_misalign4 {
    ($ptr:expr) => { ... };
}

Checks that an address is aligned to a 4 byte bound.

If the result is non-zero, that’s how many bytes past the most recent 4 byte bound you are.

#[macro_use]
extern crate retro_pixel;

fn main() {
  for x in 0 .. 100 {
    assert_eq!(check_misalign4!(x), x % 4);
  }
}