use core::f32;

use super::sqrtf;

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

pub fn hypotf(mut x: f32, mut y: f32) -> f32 {

    let x1p90 = f32::from_bits(0x6c800000); // 0x1p90f === 2 ^ 90

    let x1p_90 = f32::from_bits(0x12800000); // 0x1p-90f === 2 ^ -90

    let mut uxi = x.to_bits();

    let mut uyi = y.to_bits();

    let uti;

    let mut z: f32;

    uxi &= -1i32 as u32 >> 1;

    uyi &= -1i32 as u32 >> 1;

    if uxi < uyi {

        uti = uxi;

        uxi = uyi;

        uyi = uti;

    }

    x = f32::from_bits(uxi);

    y = f32::from_bits(uyi);

    if uyi == 0xff << 23 {

        return y;

    }

    if uxi >= 0xff << 23 || uyi == 0 || uxi - uyi >= 25 << 23 {

        return x + y;

    }

    z = 1.;

    if uxi >= (0x7f + 60) << 23 {

        z = x1p90;

        x *= x1p_90;

        y *= x1p_90;

    } else if uyi < (0x7f - 60) << 23 {

        z = x1p_90;

        x *= x1p90;

        y *= x1p90;

    }

    z * sqrtf((x as f64 * x as f64 + y as f64 * y as f64) as f32)

}