Memories. As a personal project back in... 2003?... I decided to do something similar, implement 4D Perlin Noise in Altivec assembly. The only problem was that

Memories. As a personal project back in... 2003?... I decided to do something similar, implement 4D Perlin Noise in Altivec assembly. The only problem was that I had a G3 iBook; so I would write one instruction of assembly, then write a C function to interpret that assembly, building an interpreter for a very selective subset of PPC w/ Altivec that ran (slooooowly) on the G3. As I recall I got it down to ~200 instructions, and it worked perfectly the first time I ran it on a G4, which was pretty rewarding. Took me more than half a day, though. On an unrelated note, I got an intership with Apple's performance team that summer.