Method and apparatus for verifying data types to be used for instructions and casting data types if needed
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United States of America Patent
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Sep 11, 2007
Grant Date -
Jan 26, 2006
app pub date -
Apr 29, 2004
filing date -
Apr 29, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A method, apparatus, and computer instructions in a processor for performing arithmetic operations. A data type associated with a particular memory location is used to determine if an operation about to be performed on the data in that location is legal. If the operation requires the data to have a required data type, a determination is made as to whether the operation is a legal operation based on the identified data type and the required data type. If the operation is not legal on the identified type, a determination is made as to whether data can be cast to change the identified data type to the required data type. The data is cast to the required data type if the data can be cast to form modified data, and the arithmetic operation is performed on the modified data. If the data cannot be cast to the Required type, an exception or interrupt is generated.
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