arm "neon"

[Niels Möller]

I spent most of Friday reading the arm instruction reference (primarily
motivated by a different project). It seems current GMP loops are based
on umaal, which appears to be tailor-made for addmul_1.

But in the instruction list, I also noticed VMULL, which can do two
32x32->64 products in parallel (to bad it doesn' support 64-bit inputs,
as far as I see). Has anyone played with that? And in general, where can
I find info on the timing of arm instructions (for, say, the most common
A9 and A15 implementations)?

Regards,
/Niels

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