| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rounding processing device for a numerical coprocessor capable of creating the magnitude relation between the magnitude of a rounding error and an operation result as a rounding error, further converting the rounding error to a floating point format so as to be smoothly usable for an operation to be successively performed. <P>SOLUTION: This rounding processing device for a numerical coprocessor comprises a rounding error creation part 17 for determining the difference between a mantissa b (S17) before rounding and a mantissa d after rounding (S22) in the rounding part 10 of the numerical coprocessor 3, and generating a rounding error S23 having the sign and magnitude of the rounding error; and a rounding error storage part 18 for storing the rounding error generated by the creation part 17, which is controlled by an operation part strobe bus S21 so as to enable a host processor to read the stored rounding error at an optional point of time through an internal data bus S4. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
