Also, even if ignored the fact that it was a co-processor, we don't generally count the width of the floating point and vector registers.

Otherwise most modern CPUs would be labeled as either 256-bit or 512-bit.

These days we generally label CPUs based on the width of the general purpose registers (though, it gets messy with things like the 68000). I personally suspect we won't ever see GPRs wider than 64 bits.