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Re: Pentium FDIV

To: [email protected]
Subject: Re: Pentium FDIV
From: Jim Gillogly <[email protected]>
Date: Thu, 29 Dec 94 10:07:52 PST
In-Reply-To: Your message of Thu, 29 Dec 94 11:10:45 -0600. <[email protected]>
Reply-To: [email protected]
Sender: [email protected]

> [email protected] (Paul Robichaux) writes:
> I don't know how you missed it; it was certainly here. Let me summarize:

> - crypto typically uses integers
> - RSA crypto uses large integers
> - the Pentium FDIV bug only affects floats

Yes, but Prof. Nicely found the problem because he was using FDIV when
doing something or other with large potential primes.  For most of our
crypto stuff integer is fine, but for some operations on 33- to 50-bit
integers it may be faster to use the floating point ops, since IEEE fp is
supposed to be exact for integers up to some number of bits in the 50's.

	Jim Gillogly
	Sterday, 7 Afteryule S.R. 1995, 18:07

References:
- Re: Pentium FDIV
  - From: [email protected] (Paul Robichaux)

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