Methods and apparatus for implementing and using processors with sign function capability
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United States of America Patent
Stats
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May 28, 2002
Grant Date -
Apr 11, 2002
app pub date -
Mar 15, 2001
filing date -
Jun 26, 1998
priority date (Note) -
Expired
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Abstract
Methods and apparatus for implementing and using a sign(x) function are described. In accordance with the present invention, the sign(x) function is implemented in hardware, e.g., by incorporating a simple circuit of the present invention into a central processing unit (CPU). By taking a hardware approach as opposed to the known software approach to implementing a sign(x) function, the present invention provides for an efficient sign(x) function implementation that is well suited for both SISD and SIMD systems. The hardware required to implement the sign(x) function in accordance with the present invention is relatively simple and allows for the sign(x) function to be determined in a single processor clock cycle. This is in sharp contrast to the plurality of processor clock cycles normally required to determine the sign(x) function in software embodiments. A processor sign(x) command is supported in embodiments where the hardware for performing the sign(x) function is incorporated into a processor. By incorporating a single sign(x) circuit into a processor a SISD sign(x) function can be supported. By duplicating the basic sign(x) hardware within a processor, in accordance with the present invention, a SIMD sign(x) function can be implemented. The sign(x) hardware and novel sign(x) processor command of the present invention, can be used to facilitate a variety of applications where the sign(x) function is encountered.
First Claim
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- 15 United States
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Patent Owner(s)
- HITACHI AMERICA, LTD.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Sazzad, Sharif Mohammad | Monmouth Junction, NJ | 6 | 186 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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