round off error

Researches are focused on rounding methods for high-speed floating-point multipliers in the paper,and a kind of fast rounding method based on the prediction and selection is presented.

文章针对浮点乘法器中的尾数舍入方法进行了研究,提出了一种基于预测和选择的快速舍入方法。

By using the method, the partial decoded barrel shifter is of functions of alignment shifter with additional bits for rounding and general shifter.

采用这种桶式移位器 ,可以使采用部分译码方式的移位器在原有功能的基础上增加对位右移的功能 ,并同时产生满足 IEEE舍入要求的附加位 。

By using this method, complementing and rounding are combined and processed in parallel, so that the critical path is 15 gate delays less than common circuit structure, and the circuit scale is decreased.

采用这种设计方法 ,实现了求补和舍入的合并并行 ,使关键路径的延时比常规的电路设计方案减少了 15级门 ,同时降低了电路规模 。