Module f3::examples::fpu

You can do fast, single precision, floating point math as well

#![feature(asm)]
#![no_main]
#![no_std]

#[macro_use]
extern crate f3;

#[export_name = "main"]
pub extern "C" fn main() -> ! {
    let x = black_box(2.5_f32);
    let y = black_box(3.5_f32);
    let z = black_box(x * y);

    iprintln!("{} * {} = {}", x, y, z);

    loop {}
}

// Magic to prevent optimizations like "constant folding" which is when LLVM
// performs arithmetic at compile time. This is a copy of `test::black_box`.
fn black_box<T>(x: T) -> T {
    unsafe {
        asm!("" :: "r"(&x));
    }

    x
}