Oh man, those 80-bit registers on 32-bit machines were weird. I was very confused as an undergrad when I ran the basic program to find machine epsilon, and was

Oh man, those 80-bit registers on 32-bit machines were weird. I was very confused as an undergrad when I ran the basic program to find machine epsilon, and was getting a much smaller epsilon than I expected on a 64-bit float. Turns out, the compiler had optimised all of my code to run on registers and I was getting the machine epsilon of the registers instead.