EmitAddOffset.cs

public static void EmitAddOffset(this ILGenerator il, int offset)
{
    // Push the offset to the stack
    if (offset <= 8)
    {
        il.Emit(offset switch
        {
            0 => OpCodes.Ldc_I4_0,
            1 => OpCodes.Ldc_I4_1,
            2 => OpCodes.Ldc_I4_2,
            3 => OpCodes.Ldc_I4_3,
            4 => OpCodes.Ldc_I4_4,
            5 => OpCodes.Ldc_I4_5,
            6 => OpCodes.Ldc_I4_6,
            7 => OpCodes.Ldc_I4_7,
            8 => OpCodes.Ldc_I4_8,
            _ => throw new InvalidOperationException($"Invalid offset value [{offset}]")
        });
    }
    else if (offset <= 127) il.Emit(OpCodes.Ldc_I4_S, (byte)offset);
    else il.Emit(OpCodes.Ldc_I4, offset);

    il.Emit(OpCodes.Conv_I);    // Convert the int to native int (void*)
    il.Emit(OpCodes.Add);       // Pop the two values, sum them and push the result
}