| 摘要 |
A method for extending the exponent range in an IBM System/370-type floating point arithmetic processor. Very large or very small numbers are represented by a pair of words having sign, exponent, and fraction portions thereof. If the signs of the low- and high-order words of a pair are the same, then the number is deemed to be in the ordinary processor operating range. However, if the signs differ, then the number is deemed to be out of range. In this case, a range extension is obtained by using the exponent field of the low-order word which otherwise would be transparent to the floating point processor. |
