title: 896-bit integer? Or 16384-bit?
body: <p>Since has x86_64 has 14 general-purpose registers (<code>rsp</code> and <code>rbp</code> are for stack), could you make a 896 bit integer?</p>
  <p>Or could you even use all 32 <code>zmm</code> registers (512-bit) to make a 16384-bit integer, by moving parts of it into the 64-bit registers and then calculating? I don't care if gmp is faster for this question.</p>