3-minute read By today, July 29, 2021, Intel has shipped the last of its Itanium processors, the last holdout of a rough decade of their history. You'd be forgiven for not having heard of this unusual CPU as they carved a niche of a few supercomputers in the early 2000s and some legacy mainframe holdouts. In 1994, Intel and HP looked around and saw a wide variety of successful server CPU architectures like Alpha, MIPS, SPARC, and POWER. This annoyed them and they decided to make a new CPU that no one would want to use. To these ends they invented an instruction set architecture that was impossible to program efficiently, planning that future compilers would be clever enough to make software run acceptably well. (This never happened because it turned out that anyone smart enough to write these compilers would rather be doing almost anything else.)