Patent EP0177279A2 successfully refreshed from Google Patents.
EP0177279A2
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EP
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Arithmetic apparatus
Assignee: Advanced Micro Devices Inc
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Filing: 1985-09-26
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Granted: —
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Expires: 2005-09-26
Abstract
Abstract A fully combinatorial floating point arithmetic apparatus is provided comprising separate fully combinatorial add/ subtract and multiply assemblies which share a common normalization, rounding and exponential processing apparatus.
Inventors
- 👤 Bernard New
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 06:51
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/483; G06F7/499; G06F7/49905; G06F7/49936; G06F7/49942; G06F7/49947
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
A fully combinatorial arithmetic apparatus for operating on a first and a second number, each of said numbers having a mantissa and an exponential component, comprising: means for processing the exponential components of said first and said second numbers; means for selectively adding and subtracting said mantissas of said first and said second numbers; means for multiplying said mantissas of said first and said second numbers; and means which has an output and which is responsive to a control signal for selectively multiplexing outputs from said adding and subtracting means and said multiplying means to said output of said multiplexing means.
Claim 2
Dependent Claim
101 words
A fully combinatorial arithmetic apparatus for operating on a first and a second number, each of said numbers having a mantissa and an exponential component, comprising: means for processing the exponential components of said first and said second numbers; means for selectively adding and subtracting said mantissas of said first and said second numbers; means for multiplying said mantissas of said first and said second numbers; and means which has an output and which is responsive to a control signal for selectively multiplexing outputs from said adding and subtracting means and said multiplying means to said output of said multiplexing means.
Claim 3
Dependent Claim
24 words
An apparatus according to claim 1 comprising means responsive to said output from said multiplexing means for normalizing said output of said multiplexing means.
Claim 4
Dependent Claim
59 words
An apparatus according to claim 1 comprising exceptional result handling means which has an output and which is responsive to an exceptional output from either said exponential component processing means, said adding and subtracting means or said multiplying means for providing a predetermined number at said output of said exceptional result handling means which corresponds to said exceptional output.
Claim 5
Dependent Claim
99 words
An apparatus according to claim 1 wherein said exponential component processing means comprises means responsive to said exponential components of said first and said second numbers and a control signal indicating that either an addition or a subtraction is to be performed for providing a control signal corresponding to a numerical difference between said exponential components and said adding means comprises means responsive to said control signal provided by said latter control signal providing means for aligning in a corresponding manner the mantissa of a predetermined one of said numbers with the mantissa of the other of said numbers.
Claim 6
Dependent Claim
86 words
An apparatus according to claim 4 wherein said control signal providing means of said exponential component processing means comprises means for providing a control signal which corresponds to the change required to be made to the numerical value of the lesser of the exponential components of said numbers to equalize said exponential components and said aligning means comprises means responsive to said latter control signal for aligning the mantissa of the number having said lesser exponential component with the mantissa of the other of said numbers.
Claim 7
Dependent Claim
29 words
An apparatus according to claim 4 wherein said exponential component processing means comprises means for providing an output corresponding to the greater of said exponential components of said numbers.
Claim 8
Dependent Claim
57 words
An apparatus according to claim 4 wherein said adding and subtracting means comprises means coupled to said aligning means which is responsive to a control signal for selectively adding and subtracting the mantissas of said numbers after the mantissa of said predetermined one of said numbers is aligned with the mantissa of the other of said numbers.
Claim 9
Dependent Claim
74 words
An apparatus according to claim 5 wherein said control signal providing means of said exponential component processing means and said mantissa aligning means of said adding and subtracting means comprises means responsive to the difference between said exponential components for shifting the mantissa of the number having said lesser of the exponential components relative to the mantissa of the other number by a predetermined number of places corresponding to the magnitude of said difference.
Claim 10
Dependent Claim
20 words
An apparatus according to claim 1 wherein said multiplying means is coupled in parallel with said adding and subtracting means.
Claim 11
Dependent Claim
54 words
An apparatus according to claim 2 wherein said normalizing means comprises means responsive to said output from said multiplexing means for providing an output comprising a mantissa corresponding to a number comprising a predetermined number of integers and a control signal corresponding to the value of an exponential component associated with providing said mantissa.
Claim 12
Dependent Claim
59 words
An apparatus according to claim 10 wherein said means for providing said output comprises means for shifting the output of said multiplexing means a number of places to provide said mantissa corresponding to a number comprising a single integer and said control signal corresponds to the direction and number of places said output of said multiplexing means is shifted.
Claim 13
Dependent Claim
29 words
An apparatus according to claim 10 wherein said normalizing means comprises means for rounding said mantissa to a mantissa corresponding to a number comprising a predetermined number of nonintegers.
References Cited (Backward Citations)
No citation records indexed.
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