There's a bunch in Hacker's Delight. One that comes to mind is XOR-swap. It's cute, but it's likely slower than using a temp var. Some of the integer populati

There's a bunch in Hacker's Delight. One that comes to mind is XOR-swap. It's cute, but it's likely slower than using a temp var. Some of the integer population count algos (1's counting) are clever. Also, original Doom source has some neat tricks.