Sticky z bit
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United States of America Patent
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Feb 21, 2006
Issued Date -
N/A
app pub date -
Jun 1, 2001
filing date -
Jun 1, 2001
priority date (Note) -
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status (Latency Note)
Importance
Abstract
The indication of a status affected by the performance of an ALU mathematical operation is provided. The indication includes the setting and clearing of a status bit in a status register based on the production of an arithmetic result of zero by an ALU performing the ALU mathematical operation. The result may comprise a series of results, each result produced by an ALU mathematical operation instruction executed to perform the ALU mathematical operation. Indicating a status affected by the performance of the ALU mathematical operation instruction further includes determining whether the ALU mathematical operation instruction corresponds to an ALU mathematical operation instruction with carry as well as determining whether the result is a non-zero value. The status bit maintains a value of zero upon the production of a non-zero value until an ALU mathematical operation instruction without carry is determined.
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