Truncates fractional part of a float

GetIntegerPart.cs

using System;
using System.Runtime.CompilerServices;



public static class Quack 
{
    public static float GetIntegerPart(float f)
    {
        var u = Unsafe.As<float, uint>(ref f);
        var E = (u << 1) >> (1 + 23);
        if (E < 127)
            return 0; // negative exponent -> 0
        var iE = E - 127;
        var ones = uint.MaxValue;
        ones = ones - ((1u << (int)(23 - iE + 0)) - 1);
        u &= ones;
        return Unsafe.As<uint, float>(ref u);
    }
    
    public static void Main() {
        var r = GetIntegerPart(-2.155f);
        Console.WriteLine(r);
    }
}