Methods for detecting overflow and/or underflow in a fixed...

Details Methods for detecting overflow and/or underflow in a fixed... Methods for detecting overflow and/or underflow in a fixed...

2006-12-12

2006-12-12

Mai, Tan V. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

07149766

ABSTRACT:
Methods of detecting overflow and/or underflow events are provided. The methods are preferably incorporated into a high-level programming language, but this is not necessary. In one embodiment, an increasing function that may cause overflow for a data element having a value is performed on a surrogate variable having the same value as the data element. The variable is then compared to the value to determine whether the variable, after the function is performed, is greater than the value. If the value is greater than or in some cases equal to the variable, an overflow has occurred. If the value is less than the variable, no overflow has occurred. Additional embodiments determine whether an underflow occurs with a decreasing function in similar fashion, and the function may be performed on either the variable or the value.

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