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    • 1. 发明公开
    • METHOD FOR HANDLING EXCEPTIONS IN EXCEPTION-DRIVEN SYSTEM
    • 处理异常驱动系统异常的方法
    • EP3239837A1
    • 2017-11-01
    • EP17168092.9
    • 2017-04-25
    • Imagination Technologies Limited
    • SMITH, Christopher Philip
    • G06F9/48G06F9/46
    • G06F9/3865G06F9/461G06F9/4812
    • A method of processing exceptions in an exception-driven computing-based system that operates in either initialisation mode or exception-driven mode. The method includes, upon detecting an exception has occurred, causing the processor to execute exception handling instructions. When the system is operating in initialisation mode the exception handling instructions invoke a first exception handler that causes a main register set to be saved before processing the exception and restored after processing the exception, and when the system is operating in exception-driven mode the exception handling instructions invoke a second exception handler that does not cause the main register set to be saved and restored. In some examples, the exception handling instructions are initially configured to invoke the first exception handler and are dynamically updated when the system switches from initialisation mode to exception-driven mode to invoke the second exception handler.
    • 在异常驱动的基于计算的系统中处理异常的方法,可以在初始化模式或异常驱动模式下运行。 该方法包括在检测到发生异常时使处理器执行异常处理指令。 当系统在初始化模式下运行时,异常处理指令调用第一个异常处理程序,该异常处理程序在处理异常之前导致主寄存器集保存并在处理异常之后恢复,并且当系统以异常驱动模式运行时异常 处理指令调用第二个不会导致主寄存器集被保存和恢复的异常处理程序。 在一些示例中,异常处理指令最初被配置为调用第一异常处理程序,并在系统从初始化模式切换到异常驱动模式以调用第二异常处理程序时动态更新。
    • 4. 发明公开
    • GENERATION AND UPDATE OF STATUS FLAGS IN A DATA PROCESSOR
    • 艾滋病毒感染者艾滋病毒感染者
    • EP2963540A1
    • 2016-01-06
    • EP15179650.5
    • 2009-02-11
    • Renesas Electronics Corporation
    • ARAKAWA, Fumio
    • G06F9/30G06F9/302G06F9/318G06F9/32
    • G06F9/30185G06F9/3001G06F9/30029G06F9/30058G06F9/30094G06F9/3016G06F9/30181G06F9/3865
    • The RISC data processor is based on the idea that in case that there are many flag-generating instructions, the number of flags generated by each instruction is increased so that a decrease of flag-generating instructions exceeds an increase of flag-using instructions in quantity, thereby achieving the decrease in instructions. With the data processor, an instruction for generating flags according to operands' data sizes is defined. To an instruction set handled by the RISC data processor, an instruction capable of executing an operation on operand in more than one data size, which performs a process identical to an operation process conducted on the small-size operand on low-order bits of the large-size operand, and generates flags capable of coping with the respective data sizes regardless of the data size of each operand subjected to the operation is added. Thus, the reduction in instruction code space of the RISC data processor tight in instruction code space can be achieved.
    • RISC数据处理器基于以下思想:在存在许多标志生成指令的情况下,由每个指令产生的标志数量增加,使得标志生成指令的减少超过了使用量的指令数量的增加 ,从而实现指令的减少。 使用数据处理器,定义了根据操作数的数据大小生成标志的指令。 对于由RISC数据处理器处理的指令集,指令能够执行对多于一个数据大小的操作数的操作,该指令执行与在低位上的小规模操作数上进行的操作处理相同的处理 并且生成能够应对各个数据大小的标志,而不管添加了经过操作的每个操作数的数据大小。 因此,可以实现RISC数据处理器在指令代码空间中紧缩的指令代码空间的减少。