Apparatus and method for selective control of condition code write back
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United States of America Patent
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Feb 27, 2007
Grant Date -
Oct 2, 2003
app pub date -
May 9, 2002
filing date -
Apr 2, 2002
priority date (Note) -
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Abstract
A microprocessor apparatus and method are provided, for selectively controlling write back of condition codes. The microprocessor apparatus has translation logic and extended execution logic. The translation logic translates an extended instruction into corresponding micro instructions. The extended instruction includes an extended prefix and an extended prefix tag. The extended prefix disables write back of the condition codes, where the condition codes correspond to a result of a prescribed operation. The extended prefix tag indicates the extended prefix, where the extended prefix tag is an otherwise architecturally specified opcode within an instruction set for a microprocessor. The extended execution logic is coupled to the translation logic. The extended execution logic receives the corresponding micro instructions, and generates the result, and disables write back of the condition codes.
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