浮点指令和十进制浮点指令。
Floating-point instructions and decimal floating-point instructions.
当内核在执行浮点指令时，FPU 状态不被保存。
When the kernel is executing floating point instructions, the FPU state is not saved.
SPU本身使用向量操作，每个时钟周期可以执行多达8条浮点指令。
An SPU USES vector operations itself and can thereby execute up to eight floating point instructions per clock cycle.
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