Re: PENTIUM BUG: PURITY TEST (UUENCODED BINARY)

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Article #2305

#2305

From: Marcus Bainbridge
Date: Mon, 14 Nov 1994 18:47

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Keith Pritchard wrote:

> (1.0/824633702449.0)*824633702449.0 is not equal to 1.0!

[not directed at Keith, but at whoever wrote the test program]

If you're doing things like this to that many places, you need something
better than 64-bit or 80-bit accuracy to guarantee that *all possible
calculations* are accurate.  My Casio calculator says the result is 
0.999999999.  Does this mean I can get them to replace the CPU?

OTOH, Windows calculator has trouble doing something like 1.02-1 (can't
remember the exact sum, but the answer came out as 0 when it should have
been 0.02).

-- 
Marcus Bainbridge | marcus@guitar.demon.co.uk

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Subject: Re: PENTIUM BUG: PURITY TEST (UUENCODED BINARY)
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Date: Mon, 14 Nov 1994 18:47:55 +0000
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