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    • 6. 发明申请
    • Methods and apparatus for performing mathematical operations using scaled integers
    • 使用缩放整数执行数学运算的方法和装置
    • US20050138101A1
    • 2005-06-23
    • US10740086
    • 2003-12-18
    • Ping TangGopi Kolli
    • Ping TangGopi Kolli
    • G06F7/38G06F7/57G06F7/52
    • G06F7/483G06F7/38
    • Methods, apparatus, and articles of manufacture for performing mathematical operations using scaled integers are disclosed. In particular, an example method identifies a scaled-integer value and determines a multiplier value and a scale value based on the scaled-integer value. The multiplier value is determined by extracting information from a first portion of a bitfield based on the scaled-integer value. The scale value is determined by extracting information from a second portion of the bitfield based on the scaled-integer value. The first and second portions of the bitfield are configurable to include signed integer values. The example method then performs an arithmetic operation based on the multiplier value and the scale value.
    • 公开了使用缩放整数执行数学运算的方法,装置和制品。 特别地,示例性方法识别缩放整数值,并且基于缩放整数值来确定乘数值和比例值。 通过基于缩放整数值从位字段的第一部分提取信息来确定乘数值。 通过基于缩放整数值从位域的第二部分提取信息来确定比例值。 位域的第一和第二部分可配置为包括有符号整数值。 然后,示例方法基于乘数值和比例值执行算术运算。
    • 8. 发明申请
    • Enhanced fused multiply-add operation
    • 增强融合乘法运算
    • US20060136540A1
    • 2006-06-22
    • US11019921
    • 2004-12-21
    • Ping TangDavid Donofrio
    • Ping TangDavid Donofrio
    • G06F7/38
    • G06F7/5443G06F7/483
    • An apparatus, method, and system for performing an enhanced fused multiply-add operation is disclosed. In one embodiment, an apparatus includes an exponent unit. The exponent unit includes a first adder to generate S1, where S1 is the sum of an integer k, the exponent of a floating point value A, and the exponent of a floating point value B. The exponent unit also includes a comparator to generate E1, where E1 is the greater of S1 and the exponent of a floating point value C. The apparatus also includes a partial multiplier, a shifter, and a second adder. The partial multiplier generates the partial products of the mantissas of A and B. The shifter aligns the partial products and the mantissa of C, based on E1. The second adder adds the aligned partial products and the mantissa of C. The apparatus is able to generate not only (A*B+C), but is enhanced to also be able to generate (2k*A*B+C) and the closest integer to (2k*A*B) in two's complement or floating point format.
    • 公开了一种用于执行增强的融合乘法运算的装置,方法和系统。 在一个实施例中,装置包括指数单元。 指数单元包括用于产生S 1的第一加法器,其中S 1是整数k,浮点值A的指数和浮点值B的指数之和。指数单元还包括比较器 产生E 1,其中E 1是S 1中的较大值和浮点值C的指数。该装置还包括部分乘法器,移位器和第二加法器。 部分乘法器产生A和B的尾数的部分乘积。移位器基于E 1对齐部分积和C的尾数。第二加法器将对齐的部分乘积和C的尾数相加。该装置能够 不仅产生(A * B + C),而且被增强以也能够生成(2≤K* A * B + C)和最接近的整数到(2 < / SUP> * A * B)二进制补码或浮点格式。