Apparatus and method for fast forwarding of table index (TI) bit for descriptor table selection
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United States of America Patent
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Jan 26, 1999
Grant Date -
N/A
app pub date -
Sep 11, 1996
filing date -
Sep 11, 1996
priority date (Note) -
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Abstract
An apparatus and method for improving descriptor load time in a microprocessor are provided. The method and apparatus provide an instruction sequence which loads a selector, forwards a table index (TI) bit retrieved from the selector for use by the next instruction which loads the descriptor. Forwarding of the table index bit to a register file selects between a global descriptor table and a local descriptor table for loading the descriptor, without intervening instructions or clock cycles. The forwarded table index selectively addresses either the global descriptor table or the local descriptor table only when a descriptor load instruction is immediately preceded by a selector load instruction.
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