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公开(公告)号：US3633018A
公开(公告)日：1972-01-04
申请号：US3633018D
申请日：1969-12-18
Applicant: IBM
Inventor： LING HUEI
CPC classification number: G06F7/535
Abstract: A reciprocal conversion technique for obtaining the quotient of two numbers and the reciprocal of a number. A predetermined number of leading bits of the mantissa of the denominator is used as an entry into a table used for locating the required number of shifts and adds or shifts and subtracts to form a standard from of a denominator. Significant precision control and the semireciprocal of the normalized fraction is formed in successive multiplication steps. The reciprocal of the normalized fraction is formed and the quotient can thereafter be determined with a final multiplication step.
Abstract translation: 用于获得两个数字的商和数字的倒数的互逆转换技术。 将分母的尾数的预定数量的前导比特用作用于定位所需移位数的表中的条目，并且从分母中添加或移位和减法以形成标准。 在连续的乘法步骤中形成了归一化分数的显着精度控制和半对偶。 形成归一化分数的倒数，然后可以用最终乘法步骤确定商。
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公开(公告)号：DE3481233D1
公开(公告)日：1990-03-08
申请号：DE3481233
申请日：1984-02-29
Applicant: IBM
Inventor： HAO HSIEH TUNG , LING HUEI , SACHAR HOWARD EDWARD , WEISS JEFFREY , YAMOUR YANNIS JOHN
Abstract: A pair of inherently sequential instructions, having an instruction dependency of the type in which the subsequent instruction requires as an input operand the result of the earlier instruction execution, can nevertheless be simultaneously executed by two data flow facilities (primary and secondary) under control of a control unit, without the requirement that both data flow facilities be fully equipped for all instructions. … The secondary data flow facility of this invention is generally less massive and less sophisticated than the primary data flow facility but is more sophisticated in a critical organ, the adder. The adder in the secondary data flow facility has one additional operand capability. The three-input adder of the secondary data flow facility thus is capable of replicating internally a result of the two-input adder of the primary data flow facility. Using this replicated primary adder "result", together with the additional operand capability, the secondary data flow facility three- input adder executes the dependent subsequent instruction of the pair simultaneously with the earlier instruction execution by the primary data flow facility.
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