The FDIV bug was discovered by mathematics professor Thomas Nicely from Lynchburg University in Virginia in June 1994, over a year after the Pentium’s launch. However, Nicely only understood the issue’s implications by October that year—four months later.
To identify whether a processor was affected, Nicely developed a test equation:
Correct: 4,195.835 ÷ 3,145.727 = 1.3338204491362410025
Incorrect (due to the bug): 4,195.835 ÷ 3,145.727 = 1.3337390689020375894
Nicely contacted Intel and shared his findings. Intel responded that they had already identified the problem in June but had taken no action. Nicely then shared his discovery with the academic community, and by November, the issue had reached the U.S. media.
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