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    • 2. 发明授权
    • Rounding operations in computer processor
    • 计算机处理器中的四舍五入操作
    • US06889242B1
    • 2005-05-03
    • US09895272
    • 2001-06-29
    • Frans W. SijstermansJos van Eijndhoven
    • Frans W. SijstermansJos van Eijndhoven
    • G06F7/38G06F7/499
    • G06F7/49947
    • Various methods for performing rounding operations in a computer processor are described. A machine instruction sets the rounding mode, which is automatically applied to subsequent machine instructions. Using machine instructions to round results according to the selected rounding mode has several advantages over software-implemented rounding techniques, such as faster execution and concise code. A variety of rounding modes can be specified. Depending in part on the specified rounding mode and on the sign of the value to be rounded, a rounding term is added to the value to be rounded. Adding this rounding term ensures that the desired result is obtained. The value thus obtained is then right-shifted.
    • 描述了用于在计算机处理器中执行舍入操作的各种方法。 机器指令设置舍入模式,自动应用于后续机器指令。 使用机器指令根据选择的舍入模式舍入结果与软件实现的舍入技术相比具有几个优点,例如更快的执行和简洁的代码。 可以指定各种舍入模式。 部分取决于指定的舍入模式和要舍入的值的符号,舍入项将被添加到要舍入的值。 添加这个四舍五入的术语确保获得所需的结果。 然后将由此获得的值右移。