use super::copysignf;

use super::truncf;

use core::f32;

#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]

pub fn roundf(x: f32) -> f32 {

    truncf(x + copysignf(0.5 - 0.25 * f32::EPSILON, x))

}

// PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520

#[cfg(not(target_arch = "powerpc64"))]

#[cfg(test)]

mod tests {

    use super::roundf;

    #[test]

    fn negative_zero() {

        assert_eq!(roundf(-0.0_f32).to_bits(), (-0.0_f32).to_bits());

    }

    #[test]

    fn sanity_check() {

        assert_eq!(roundf(-1.0), -1.0);

        assert_eq!(roundf(2.8), 3.0);

        assert_eq!(roundf(-0.5), -1.0);

        assert_eq!(roundf(0.5), 1.0);

        assert_eq!(roundf(-1.5), -2.0);

        assert_eq!(roundf(1.5), 2.0);

    }

}