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19

Intel had a rather complex bunch of hardware to compute a floating-point quotient in a way that yielded two bits per iteration, which required having a rather large table listing all the combinations of bit patterns where part of the quotient should be 11 [rather than listing all patterns individually, the table would have had entries where each bit may be 0,...


27

Stephen Kitt has already provided a good answer regarding the FDIV bug. I'll fill in some details about Intel employing logicians: Because of this bug, Intel had to replace a lot of processors, which was very expensive. Not wanting to repeat this, they hired a number of computer scientists with background in formal logic to prove the correctness of ...


73

I suspect your teacher was referring to the FDIV Pentium bug, which led to a large outcry in the media at the time and for which Intel issued a recall. This bug caused floating-point division to return incorrect results in some cases. It didn’t affect only FDIV, some related instructions were affected: the other division and remainder instructions, and FPTAN ...


2

I think this is probably referring to the Pentium FDIV bug (floating-point divide bug). I don't recall any specific problems with trigonometry instructions.


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