tg at gmplib.org
Tue Dec 20 14:50:27 UTC 2016
"Marco Bodrato" <bodrato at mail.dm.unipi.it> writes:
> On the other side, both sqrt64_ and sqrt64x2_ use invroot*invroot, maybe
> table can store both the value and the squared value.
The same comment applies also to current code in GMP, the GMP_NUMB_BITS>32
Surely possible. The cost would be at least 768 bytes.
The x0 value which is squared is 9 bits, with the msb predictably 1.
With some extra instructions, 384 to handle that msb 16-bit entries
But with extra instructions, the benefits will quickly evaporate...
Please encrypt, key id 0xC8601622
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