It started innocently enough with my wondering why High-performance Erlang (HiPE) was not available on my shiny new MacBook Pro. This turned into a long but awesome email exchange and culminated in victory, and my port of HiPE to Mac Intel, less than two weeks later.
I learned a fair number of things about the Mac OSX kernel, the FPU, floating-point exceptions, Intel 32-bit architecture and SSE2 along the way. I also had an awesome time with assembler code.
I could not have done it without the mach_override library and numerous tips from Mikael Pettersson as well as other folks on the Erlang Questions mailing list. I will be shipping my patches to the HiPE team this week.