From: Mikael Djurfeldt <djurfeldt@nada.kth.se>
Cc: guile-devel@gnu.org
Subject: Re: Nearly finished (re)integrating GMP for bignums.
Date: Thu, 06 Mar 2003 19:13:25 +0100 [thread overview]
Message-ID: <xy73cm0fjne.fsf@nada.kth.se> (raw)
In-Reply-To: <87n0k8v1u9.fsf@raven.i.defaultvalue.org> (Rob Browning's message of "Thu, 06 Mar 2003 11:31:26 -0600")
Rob Browning <rlb@defaultvalue.org> writes:
> Mikael Djurfeldt <djurfeldt@nada.kth.se> writes:
>
>> It does this by allocating a bignum b with as many base 65536 digits
>> as m, filling b with random bits (in 32 bit chunks) up to the most
>> significant 1 in m, and, finally checking if the resultant b is too
>> large (>= m). If too large, we simply repeat the process again.
>> (It is important to throw away all generated random bits if b >= m,
>> otherwise we'll end up with a distorted distribution.)
>
> It looks like the old code handled 16-bit chunks at a time. I just
> wanted to make sure it was OK to go ahead and use the full "unsigned
> long" random_bits range per-chunk instead if that works out better.
No, in fact, the old code also used all 32 random bits a long word at
a time. And, yes, that should be OK with our RNG.
M
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prev parent reply other threads:[~2003-03-06 18:13 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-12 16:07 Nearly finished (re)integrating GMP for bignums Rob Browning
2003-02-12 16:26 ` Marius Vollmer
2003-02-12 17:32 ` Rob Browning
2003-02-12 17:34 ` Mikael Djurfeldt
2003-02-12 18:57 ` Rob Browning
2003-02-12 21:13 ` Rob Browning
2003-02-12 23:00 ` Kevin Ryde
2003-02-27 5:11 ` Rob Browning
2003-03-03 13:13 ` Mikael Djurfeldt
2003-03-03 13:21 ` Mikael Djurfeldt
2003-03-06 17:31 ` Rob Browning
2003-03-06 18:13 ` Mikael Djurfeldt [this message]
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