首页> 外国专利> Apparatus and method for accelerating the effective subtraction method by approximating the absolute value of the difference between exponent arguments.

Apparatus and method for accelerating the effective subtraction method by approximating the absolute value of the difference between exponent arguments.

机译:通过近似指数自变量之差的绝对值来加速有效减法的装置和方法。

摘要

The arithmetic operations performed for floating point format numbers involve procedures having a multiplicity of major steps. In the performance of the effective subtraction operation, the determination of absolute value of the difference between the operand exponent arguments must be obtained in order to determine the correct procedure. In the present invention, a difference between a subset of the operand exponent arguments is calculated and the result of this calculation is used to anticipate the correct procedure. By careful selection of the anticipated correct procedure, when the selection is erroneous, the correct result is immediately available. The availability of the correct result is achieved by selecting the subset of operand exponent arguments so that, in the event that the result is erroneous, the correct difference is such that the associated operand fraction (i.e., to be shifted by the amount of the difference) is shifted completely out of the operand fraction field (stored in a register).
机译:对浮点格式编号执行的算术运算涉及具有多个主要步骤的过程。在执行有效的减法运算时,必须确定操作数指数参数之间的差的绝对值,以便确定正确的过程。在本发明中,计算操作数指数变量的子集之间的差,并且该计算的结果用于预期正确的过程。通过仔细选择预期的正确过程,如果选择错误,将立即获得正确的结果。正确结果的可用性是通过选择操作数指数参数的子集来实现的,因此,如果结果是错误的,则正确的差值应是关联的操作数分数(即,将差值相移) )完全移出了操作数小数字段(存储在寄存器中)。

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