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1. 发明授权

US06397239B2 Floating point addition pipeline including extreme value, comparison and accumulate functions 有权
标题翻译：浮点附加流水线包括极值，比较和累加功能
公开(公告)号：US06397239B2
公开(公告)日：2002-05-28
申请号：US09778352
申请日：2001-02-06
申请人： Stuart F. Oberman , Norbert Juffa , Fred Weber , Krishnan Ramani , Ravi Krishna Cherukuri
发明人： Stuart F. Oberman , Norbert Juffa , Fred Weber , Krishnan Ramani , Ravi Krishna Cherukuri
IPC分类号： G06F742
CPC分类号： G06F7/483 , G06F9/30014 , G06F9/30021 , G06F9/30036 , H03M7/24
摘要： A multimedia execution unit configured to perform vectored floating point and integer instructions. The execution unit may include an add/subtract pipeline having far and close data paths. The far path is configured to handle effective addition operations and effective subtraction operations for operands having an absolute exponent difference greater than one. The close path is configured to handle effective subtraction operations for operands having an absolute exponent difference less than or equal to one. The close path is configured to generate two output values, wherein one output value is the first input operand plus an inverted version of the second input operand, while the second output value is equal to the first output value plus one. Selection of the first or second output value in the close path effectuates the round-to-nearest operation for the output of the adder.
摘要翻译：多媒体执行单元被配置为执行矢量的浮点和整数指令。执行单元可以包括具有远近数据路径的加法/减法流水线。远程路径被配置为处理具有大于1的绝对指数差的操作数的有效加法运算和有效减法运算。关闭路径被配置为处理具有小于或等于1的绝对指数差的操作数的有效减法操作。关闭路径被配置为生成两个输出值，其中一个输出值是第一输入操作数加上第二输入操作数的反转版本，而第二输出值等于第一输出值加1。在闭合路径中选择第一或第二输出值对加法器的输出实现了舍入到最近的运算。

2. 发明授权

US06393554B1 Method and apparatus for performing vector and scalar multiplication and calculating rounded products 有权
标题翻译：执行向量和标量乘法并计算舍入积的方法和装置
公开(公告)号：US06393554B1
公开(公告)日：2002-05-21
申请号：US09487771
申请日：2000-01-19
申请人： Stuart F. Oberman , Ming Siu , Ravi Krishna Cherukuri
发明人： Stuart F. Oberman , Ming Siu , Ravi Krishna Cherukuri
IPC分类号： G06F752
CPC分类号： G06F7/53 , G06F7/4991 , G06F7/49936 , G06F7/49963 , G06F7/49994 , G06F7/5338 , G06F7/5443 , G06F9/30014 , G06F9/30036 , G06F9/3017 , G06F9/3804 , G06F9/3885 , G06F17/16 , G06F2207/3828
摘要： A multiplier capable of performing signed and unsigned scalar and vector multiplication is disclosed. The multiplier is configured to receive signed or unsigned multiplier and multiplicand operands in scalar or packed vector form. An effective sign for the multiplier and multiplicand operands may be calculated based upon each operand's most significant bit and a control signal. The effective signs may then be used to create and select a number of partial products according to Booth's algorithm. Once the partial products have been created and selected, they may be summed and the results may be output. The results may be signed or unsigned, and may represent vector or scalar quantities. When a vector multiplication is performed, the multiplier may be configured to generate and select partial products so as to effectively isolate the multiplication process for each pair of vector components. The multiplier may also be configured to sum the products of the vector components to form the vector dot product. The final product may be output in segments so as to require fewer bus lines. The segments may be rounded by adding a rounding constant. Rounding and normalization may be performed in two paths, one assuming an overflow will occur, the other assuming no overflow will occur.
摘要翻译：公开了能够执行有符号和无符号标量和矢量乘法的乘法器。乘法器配置为以标量或压缩向量形式接收带符号或无符号乘数和被乘数操作数。可以基于每个操作数的最高有效位和控制信号来计算乘法器和被乘数操作数的有效符号。然后根据布斯算法，有效符号可用于创建和选择多个部分乘积。一旦创建并选择了部分产品，就可以对它们进行求和并输出结果。结果可能是有符号或无符号的，可能表示向量或标量。当执行向量乘法时，乘法器可以被配置为产生和选择部分乘积，以便有效地隔离每对向量分量的乘法过程。乘法器还可以被配置为对矢量分量的乘积求和以形成向量点积。最终产品可以以分段输出，以便需要更少的总线。可以通过添加舍入常数来对段进行舍入。可以在两个路径中执行舍入和归一化，一个假设将发生溢出，另一个假设不会发生溢出。

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