No More Vectors
Today's microprocessors have vector instruction sets such as MMX, AltiVec, and SSE, which involve dividing a wide chunk of memory into several numbers. This derives from such computers as the AN/FSQ-32 and the Lincoln Laboratory TX-2.
The other kind of vector instruction, where a vector might consist of a large number of double-precision numbers - 64 of them, instead of 2 - but instead of being fetched all at once, is processed one number to a clock in a dense pipeline sequence - is the one used in computers like the Cray I.
Back around 1994, you could buy a board with the Fujitsu MB92831 on it - it was a single-chip co-processor with vector registers and vector instructions like those of a Cray, used in machines like the Mieko CS2.
Why we don't have things like that now, but even better, is well-known, so they say: the extreme cost advantages of commodity hardware, and the huge gap between memory bandwidth and computing speed, which reduces the benefits from vector instructions. But I still wonder, and suspect that classic vector instructions would benefit commodity micros for prosaic tasks like computer games.