SortUtils.cs

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namespace System.Collections.Generic;
 
internal static class SortUtils
{
    public static int MoveNansToFront<TKey, TValue>(Span<TKey> keys, Span<TValue> values)
    {
        int num = 0;
        for (int i = 0; i < keys.Length; i++)
        {
            if ((typeof(TKey) == typeof(double) && double.IsNaN((double)(object)keys[i])) || (typeof(TKey) == typeof(float) && float.IsNaN((float)(object)keys[i])) || (typeof(TKey) == typeof(Half) && Half.IsNaN((Half)(object)keys[i])))
            {
                TKey val = keys[num];
                keys[num] = keys[i];
                keys[i] = val;
                if ((uint)i < (uint)values.Length)
                {
                    TValue val2 = values[num];
                    values[num] = values[i];
                    values[i] = val2;
                }
                num++;
            }
        }
        return num;
    }
}