use core::f32;

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

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

    // On wasm32 we know that LLVM's intrinsic will compile to an optimized

    // `f32.trunc` native instruction, so we can leverage this for both code size

    // and speed.

    llvm_intrinsically_optimized! {

        #[cfg(target_arch = "wasm32")] {

            return unsafe { ::core::intrinsics::truncf32(x) }

        }

    }

    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)

}

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

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

#[cfg(test)]

mod tests {

    #[test]

    fn sanity_check() {

        assert_eq!(super::truncf(1.1), 1.0);

    }

}