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It's been 30 years since Intel's infamous Pentium FDIV bug reared its ugly head

42 点作者 thebeardisred6 个月前

8 条评论

rwmj6 个月前
While this was a PR disaster for Intel, for me the Pentium FOOF bug[1] was much more consequential since it meant anyone could run a trivial command to lock up our shared Linux machines. Luckily Linux found a fix for it fairly quickly.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Pentium_F00F_bug" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Pentium_F00F_bug</a>
sime20096 个月前
From <a href="https:&#x2F;&#x2F;www.sgoc.de&#x2F;pentium.html" rel="nofollow">https:&#x2F;&#x2F;www.sgoc.de&#x2F;pentium.html</a><p><pre><code> Q: How many Pentium designers does it take to screw in a light bulb? A: 1.99904274017, but that&#x27;s close enough for non-technical people. Q: What do you get when you cross a Pentium PC with a research grant? A: A mad scientist. Q: What&#x27;s another name for the &quot;Intel Inside&quot; sticker they put on Pentiums? A: The warning label. Q: What do you call a series of FDIV instructions on a Pentium? A: Successive approximations. Q: Complete the following word analogy: Add is to Subtract as Multiply is to: 1) Divide 2) ROUND 3) RANDOM 4) On a Pentium, all of the above A: Number 4. Q: Why didn&#x27;t Intel call the Pentium the 586? A: Because they added 486 and 100 on the first Pentium and got 585.999983605. Q: According to Intel, the Pentium conforms to the IEEE standards 754 and 854 for floating point arithmetic. If you fly in aircraft designed using a Pentium, what is the correct pronunciation of &quot;IEEE&quot;? A: Aaaaaaaiiiiiiiiieeeeeeeeeeeee! TOP TEN NEW INTEL SLOGANS FOR THE PENTIUM ------------------------------------------- 9.9999973251 It&#x27;s a FLAW, Dammit, not a Bug 8.9999163362 It&#x27;s Close Enough, We Say So 7.9999414610 Nearly 300 Correct Opcodes 6.9999831538 You Don&#x27;t Need to Know What&#x27;s Inside 5.9999835137 Redefining the PC -- and Mathematics As Well 4.9999999021 We Fixed It, Really 3.9998245917 Division Considered Harmful - No Life- Maintenance Devices Should Be Used With This Processor 2.9991523619 Why Do You Think They Call It *Floating* Point? 1.9999103517 We&#x27;re Looking for a Few Good Flaws And the 0.9999999998th Slogan Is... The Errata Inside</code></pre>
throw0101d6 个月前
Have a friend who was doing is masters at the time in neural networks, and was making use of FP a lot. He was getting strange results, especially in comparing what he was getting at home on his PC and what he was getting in the school labs on SPARC.<p>He had (a) do a lot of effort to &#x27;prove&#x27; to Intel that his CPU was faulty, and then (b) sign an NDA to get a replacement chip.<p>A week after he signed the agreement and sent it in they publicly announced the recall.
Dachande6636 个月前
Today I learn where the name Pentium actually came from (fifth in Intel&#x27;s release history, pent).
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dvh6 个月前
Obligatory joke from the era (when pronouncing Motorola lines do long pauses between words):<p><pre><code> Motorola: what is one plus one? Pentium: three! Motorola: that is incorrect! Pentium: yeah, but it&#x27;s fast!</code></pre>
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oniony6 个月前
&gt;justn’t<p>Wah
garganzol6 个月前
From the article: &quot;Intel believed it was justn’t a big deal&quot;. Is it a thing in English language to form &quot;justn&#x27;t&quot; like that as a shortcut for &quot;just not&quot;?
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jmclnx6 个月前
Now we have spectre, after 30 years Intel did not learn any lessons. More things change, the more they stay the same.