Three-Term Predictive Adder and/or Subtracter
    61.
    发明申请
    Three-Term Predictive Adder and/or Subtracter 审中-公开
    三阶预测加法器和/或减法器

    公开(公告)号:US20140181165A1

    公开(公告)日:2014-06-26

    申请号:US14192102

    申请日:2014-02-27

    CPC classification number: G06F7/57 G06F7/5055 G06F7/506

    Abstract: A predictive adder produces the result of incrementing and/or decrementing a sum of A and B by a one-bit constant of the form of the form 2k, where k is a bit position at which the sum is to be incremented or decremented. The predictive adder predicts the ripple portion of bits in the potential sum of the first operand A and the second operand B that would be toggled by incrementing or decrementing the sum A+B by the one-bit constant to generate and indication of the ripple portion of bits in the potential sum. The predictive adder uses the indication of the ripple portion of bits in the potential sum and the carry output generated by evaluating A+B to produce the results of at least one of A+B+2k and A+B−2k.

    Abstract translation: 预测加法器产生将形式为2k的1比特常数递增和/或递减A和B的和的结果,其中k是要递增或递减的比特位置。 预测加法器预测第一操作数A和第二操作数B的电位之和的纹波部分,该第一操作数A和第二操作数B将通过将和A + B递增或递减1比特常数来切换,以产生和指示波纹部分 的位数在电位和。 预测加法器使用电位和中的波纹部分的指示和通过评估A + B产生的进位输出来产生A + B + 2k和A + B-2k中的至少一个的结果。

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