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    • 6. 发明申请
    • ARITHMETIC UNIT FOR ADDITION OR SUBTRACTION WITH PRELIMINARY SATURATION DETECTION
    • 用于添加或减去初步饱和度检测的算术单元
    • WO2005010746A1
    • 2005-02-03
    • PCT/US2004/023431
    • 2004-07-21
    • SANDBRIDGE TECHNOLOGIES, INC.SCHULTE, Michael, J.HOKENEK, ErdemBALZOLA, Pablo, I.GLOSSNER, John, C.
    • SCHULTE, Michael, J.HOKENEK, ErdemBALZOLA, Pablo, I.GLOSSNER, John, C.
    • G06F7/50
    • G06F7/507G06F7/49921
    • An arithmetic unit for performing an arithmetic operation on at least first and second input operands, each of the input operands being separable into a first portion and a second portion, such as respective less significant and more significant portions. The arithmetic unit comprises first arithmetic circuitry, second arithmetic circuitry, selection circuitry and saturation circuitry. The first arithmetic circuitry, which may comprise a carry-propagate adder, processes the first portions of the input operands to generate at least a temporary sum and a carry output. The second arithmetic circuitry, which may comprise a dual adder and a preliminary saturation detector, processes the second portions of the input operands to generate one or more temporary sums and a number of saturation flags. The selection circuitry is configured to select one or more of the outputs of the second arithmetic circuitry based on the carry output of the first arithmetic circuitry. The saturation circuitry has inputs coupled to corresponding outputs of the first arithmetic circuitry and the selection circuitry, and is configured to generate a result of the arithmetic operation.
    • 一种用于对至少第一和第二输入操作数执行算术运算的算术单元,每个输入操作数可分为第一部分和第二部分,例如各自不太重要和更重要的部分。 算术单元包括第一运算电路,第二运算电路,选择电路和饱和电路。 可以包括进位传播加法器的第一运算电路处理输入操作数的第一部分以产生至少一个临时和和进位输出。 可以包括双加法器和初步饱和检测器的第二运算电路处理输入操作数的第二部分以产生一个或多个临时和和多个饱和标志。 选择电路被配置为基于第一运算电路的进位输出来选择第二运算电路的一个或多个输出。 饱和电路具有耦合到第一算术电路和选择电路的对应输出的输入,并且被配置为产生算术运算的结果。