fdiv

1994. Intel ships the Pentium, and every so often it divides two numbers and hands back a slightly wrong answer. Intel's official line: this happens once every 27000 years, so relax. Then a math professor goes public, the story explodes, and Intel eats a 475 million dollar recall. The root cause was a handful of missing entries in a lookup table burned into the silicon. Same idea here, much smaller table. Find the wrong cells and fix them.