use core::f32;

#[inline]
pub fn truncf(x: f32) -> f32 {
    let x1p120 = f32::from_bits(0x7b800000); // 0x1p120f === 2 ^ 120

    let mut i: u32 = x.to_bits();
    let mut e: i32 = (i >> 23 & 0xff) as i32 - 0x7f + 9;
    let m: u32;

    if e >= 23 + 9 {
        return x;
    }
    if e < 9 {
        e = 1;
    }
    m = -1i32 as u32 >> e;
    if (i & m) == 0 {
        return x;
    }
    force_eval!(x + x1p120);
    i &= !m;
    f32::from_bits(i)
}

#[cfg(test)]
mod tests {
    #[test]
    fn sanity_check() {
        assert_eq!(super::truncf(1.1), 1.0);
    }
}