1. A method comprising: in a computer system including a first load/store execution unit, a first Level 1 (L1) data cache unit coupled to the first load/store execution unit, a second load/store execution unit, and a second L1 data cache unit coupled to the second load/store execution unit, directing some instructions to the first load/store execution unit and other instructions to the second load/store execution unit when executing a single thread of instructions.