Multiple threads are divided into buddy groups of two or more threads, so that each thread has assigned to it one or more buddy threads. Only one thread in each buddy group actively executes instructions and this allows buddy threads to share hardware resources, such as registers. When an active thread encounters a swap event, such as a swap instruction, the active thread suspends execution and one of its buddy threads begins execution using that thread's private hardware resources and the buddy group's shared hardware resources. As a result, the thread count can be increased without replicating all of the per-thread hardware resources.

 
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