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    • 8. 发明公开
    • 복수의 명령어 모드를 구비한 데이터 처리회로
    • 具有多种指令模式的数据处理电路
    • KR1020090092753A
    • 2009-09-01
    • KR1020097006743
    • 2007-09-06
    • 실리콘 하이브 비.브이.
    • 레이흐텐,제로엔,안톤,요한즈와르텐코트,헨드리크,트에르트,요아네스
    • G06F9/30G06F9/318G06F9/45G06F9/32
    • G06F9/30149G06F8/445G06F9/30054G06F9/30138G06F9/30181G06F9/30189G06F9/322G06F9/3816G06F9/3867G06F8/40G06F9/30G06F9/32
    • A data processing circuit has an execution circuit (18) with a plurality of functional units (20). An instruction decoder (17) is operable in a first and a second instruction mode. In the first instruction mode instructions have respective fields for controlling each of the functional units (20), and in the second instruction mode instructions control one functional unit. A mode control circuit (12) controls the selection of the instruction modes. In an embodiment, the instruction decoder uses time-stationary decoding of the selection of operations to be executed by the execution circuit (18) and the selection of destination registers from the set of registers (19). Mode switching is a more efficient way of reducing instruction time for time stationary processors than indicating functional units for which the instruction contains commands. When instructions are scheduled, constraints are preferably imposed on operations for which operation selection and destination register selection are included on different sides of an instruction mode change. Such operations are avoided in an embodiment. In another embodiment, selected operations are scheduled for which operation selection and destination register selection are included on different sides of an instruction mode change. When an instruction containing a jump is encountered, the mode control circuit sets the instruction mode for subsequent instructions in conformity with information provided by the execution of the jump command.
    • 数据处理电路具有具有多个功能单元(20)的执行电路(18)。 指令解码器(17)可在第一和第二指令模式下操作。 在第一指令模式中,指令具有用于控制每个功能单元(20)的各个字段,并且在第二指令模式中,指令控制一个功能单元。 模式控制电路(12)控制指令模式的选择。 在一个实施例中,指令解码器使用由执行电路(18)执行的操作选择的时间稳定解码和来自寄存器组(19)的目的地寄存器的选择。 与指示包含命令的功能单元相比,模式切换是减少时间固定处理器的指令时间的更有效的方式。 当指令被调度时,优选地对操作选择和目标寄存器选择包括在指令模式改变的不同侧的操作施加约束。 在一个实施例中避免了这样的操作。 在另一个实施例中,调度所选择的操作,其中操作选择和目的地寄存器选择被包括在指令模式改变的不同侧。 当遇到包含跳转的指令时,模式控制电路根据由执行跳转命令提供的信息来设置随后指令的指令模式。