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000149_ernie@gaspra.pd.com_Tue Dec 6 18:22:33 PST 1994.msg
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Article: 402 of comp.graphics.packages.lightwave
Xref: netcom.com comp.graphics.packages.lightwave:402
Path: netcom.com!csus.edu!csusac!charnel.ecst.csuchico.edu!newshost.marcam.com!news.kei.com!ddsw1!news.rtd.com!gaspra.pd.com!ernie
From: Ernie Wright <ernie@gaspra.pd.com>
Newsgroups: comp.graphics.packages.lightwave
Subject: Pentium test
Date: Sun, 4 Dec 1994 20:42:27 -0700
Organization: RTD Internet Access, a division of RTD Systems & Networking, Inc.
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Message-ID: <Pine.SUN.3.91.941204203904.13531A-100000@gaspra.pd.com>
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There's an easy way to test for a buggy Pentium FPU. Using Calculator,
the Windows accessory, enter
4195835 / 3145727 = * 3145727 =
If your answer is 4195579, you've found a Pentium with the FDIV bug.
This instance of the bug was discovered by Tim Coe using MATLAB and
reported by Cleve Moler on comp.soft-sys.matlab. (The expression was
x - (x/y) * y, with x and y equal to the first two numbers above. In
real life, this is 0, and on computers it should be 0 to at least the
9th decimal place. On a bad Pentium it equals 256.)
- Ernie