> x86 has... what... FOUR main registers? And the FPU register stack...
> which is also the MMX registers... but then a separate set of XMM
> registers added for the SSE instruction set?... but then SSE2 made them
> wider, so there's XMMX... WHAT THE HELL IS GOING ON?!?!

Backwards compatibility is what's going on.

> I gather ARM is quite a popular architecture. I don't know whether
> that's because there's readily available chips and IP-cores, because
> it's low-power, or because it's really easy to program...

Low power.

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